Public recordAt risk
Software health reportschema 0.27.0 · metrics 1.13.0 · 2026-07-22 23:30 UTC
jhchen / fast-diff
A fast Javascript string diff
jhchen/fast-diff holds a health index of 39 out of 100, placing it in the At risk band. It scores highest on Community & Adoption (69/100) and lowest on Vitality (1/100). It was last updated 1160 days ago. A single contributor accounts for most of its recent work.
39
overall / 100Software health index
Metrics are grouped into weighted categories on one standardized 1–100 scale. Overall starts as their weighted mean; when public evidence triggers the High-Risk Jurisdiction Policy, the rating is adjusted and receives an At risk ceiling of 49. AI Readiness sits outside the overall score.
39
Excellent85-100Exemplary; meets essentially all checked criteria
Good70-84Healthy; minor gaps
Moderate50-69Acceptable with notable gaps; review recommended
At risk30-49Significant weaknesses; adoption warrants caution
Critical1-29Severe problems (abandoned, single-maintainer, no hygiene)
Score profile
Each axis is a category. The shape matters more than the average — a healthy subject fills the whole shape, while a spike-and-crater profile means strength in one dimension is masking risk in another.
Ownership
Jason ChenPersonal account
624 followers12 public repossince Jan 2010@slab
This repository is owned by a personal account. A single-owner project carries more continuity risk than an organization-backed one.
Package ecosystems
| Registry | Package | Version | Downloads / mo | Versions | Last publish | Tags |
|---|---|---|---|---|---|---|
| npm | fast-diff | 1.3.0 | 184,724,615 | 7 | 1160 days ago | diff |
Metrics by category
Vitality
Is the project alive — is code being written and are releases shipping?
1
Development activity
1Critical
How it's scored
| 0/36 | Push recency — last push 1,160 days ago |
| 0/36 | Commit cadence — 0/52 weeks with commits |
| 0/18 | Commit volume — 0 commits in the last year |
| 0/10 | OpenSSF Scorecard: Maintained — 0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0 |
Inputs used
| commits_last_year | 0 |
| human_commit_share | 1 |
| days_since_last_push | 1,160 |
| active_weeks_last_year | 0 |
Release discipline
1Critical
How it's scored
| 0/27 | Ships releases — no releases published |
| 0/36 | Release recency — no releases |
| 0/27 | Release cadence — no releases |
| 0/10 | OpenSSF Scorecard: Signed-Releases — no data |
Inputs used
| releases_count | 0 |
Excluded from scoring (no data or not applicable): OpenSSF Scorecard: Signed-Releases. Remaining weights renormalized.
Community & Adoption
Does the project have users, downloads, attention, and a welcoming setup for contributors?
69
Popularity & adoption
66Moderate
How it's scored
| 46.3/60 | Stars — 715 stars |
| 13.9/25 | Forks — 48 forks |
| 5.6/15 | Watchers — 11 watchers |
Inputs used
| forks | 48 |
| stars | 715 |
| watchers | 11 |
| growth_state | unverified |
| growth_factor_pct | 100 |
| growth_unverified_reason | no_history |
Community health
50Moderate
How it's scored
| 22.5/22.5 | README |
| 22.5/22.5 | License — recognized license (Apache-2.0) |
| 0/18 | CONTRIBUTING guide |
| 0/13.5 | Code of conduct |
| 0/7.2 | Issue template |
| 0/6.3 | PR template |
Inputs used
| has_readme | yes |
| has_license | yes |
| has_contributing | no |
| has_issue_template | no |
| has_code_of_conduct | no |
| has_pull_request_template | no |
Ecosystem adoption (downloads)
100Excellent
How it's scored
| 80/80 | Monthly downloads — 184,724,615 downloads/month across npm |
| 0/20 | Registry dependents — not reported by this ecosystem |
Inputs used
| packages | fast-diff |
| dependents | — |
| ecosystems | npm |
| total_downloads | — |
| monthly_downloads | 184,724,615 |
Excluded from scoring (no data or not applicable): Registry dependents. Remaining weights renormalized.
Sustainability & Governance
Will the project survive its people — bus factor, responsiveness, who backs it, and package upkeep?
53
Maintainer resilience (bus factor)
32At risk
How it's scored
| 9/54 | Bus factor — 1 contributor(s) cover half of all commits |
| 7.9/22.5 | Commit distribution — top contributor authored 65% of commits |
| 5.4/13.5 | Contributor breadth — 4 contributors |
| 10/10 | OpenSSF Scorecard: Contributors — project has 7 contributing companies or organizations |
Inputs used
| bus_factor | 1 |
| contributors_sampled | 4 |
| top_contributor_share | 0.65 |
Issue & PR responsiveness
54Moderate
How it's scored
| 40.1/46.8 | Issue resolution — 86% of issues closed |
| 12.8/38.3 | PR acceptance — 4/12 decided PRs merged |
| 1.5/15 | OpenSSF Scorecard: Code-Review — Found 3/23 approved changesets -- score normalized to 1 |
Inputs used
| merged_prs | 4 |
| open_issues | 2 |
| closed_issues | 12 |
| issue_closed_ratio | 0.857 |
| closed_unmerged_prs | 8 |
Ownership & stewardship
63Moderate
How it's scored
| 10/30 | Ownership backing — personal (user) account |
| 0/20 | Verified domain — not applicable to user accounts |
| 20.1/25 | Owner reach — 624 followers of jhchen |
| 20.1/25 | Track record — 12 public repos, account ~16 yr old |
Inputs used
| followers | 624 |
| owner_type | User |
| is_verified | — |
| owner_login | jhchen |
| public_repos | 12 |
| account_age_days | 6,017 |
Excluded from scoring (no data or not applicable): Verified domain. Remaining weights renormalized.
Package maintenance
69Moderate
How it's scored
| 25/25 | Published & resolvable — 1 package(s) on npm |
| 4/35 | Publish recency — latest publish 1,160 days ago |
| 20/20 | Version history — 7 published versions |
| 20/20 | Not deprecated — active, not deprecated or yanked |
Inputs used
| packages | fast-diff |
| ecosystems | npm |
| any_deprecated | no |
| min_days_since_publish | 1,160 |
Engineering Quality
Are baseline engineering and documentation practices in place?
34
Engineering practices
24Critical
How it's scored
| 24/24 | CI workflows — 1 workflow(s) |
| 0/24 | Tests present |
| 0/16 | Linter config |
| 0/9.6 | Pre-commit hooks |
| 0/6.4 | .editorconfig |
| 0/20 | OpenSSF Scorecard: CI-Tests — 0 out of 4 merged PRs checked by a CI test -- score normalized to 0 |
Inputs used
| has_ci | yes |
| has_tests | no |
| has_editorconfig | no |
| has_linter_config | no |
| has_precommit_config | no |
Documentation
50Moderate
How it's scored
| 30/30 | README |
| 0/25 | Documentation directory |
| 0/15 | Documentation / homepage site |
| 10/10 | Repository description |
| 0/10 | Topics |
| 10/10 | Wiki |
Inputs used
| topics | — |
| has_wiki | yes |
| homepage | — |
| has_readme | yes |
| has_docs_dir | no |
| has_description | yes |
Security
Are visible security and supply-chain practices strong, without unresolved high-risk jurisdiction exposure?
40
Security posture
25Critical
How it's scored
| 7.5/7.5 | Binary-Artifacts — no binaries found in the repo |
| 0/7.5 | Branch-Protection — branch protection not enabled on development/release branches |
| 0/2.5 | CI-Tests — 0 out of 4 merged PRs checked by a CI test -- score normalized to 0 |
| 0/2.5 | CII-Best-Practices — no effort to earn an OpenSSF best practices badge detected |
| 0.8/7.5 | Code-Review — Found 3/23 approved changesets -- score normalized to 1 |
| 2.5/2.5 | Contributors — project has 7 contributing companies or organizations |
| 10/10 | Dangerous-Workflow — no dangerous workflow patterns detected |
| 0/7.5 | Dependency-Update-Tool — no update tool detected |
| 0/5 | Fuzzing — project is not fuzzed |
| 2.5/2.5 | License — license file detected |
| 0/7.5 | Maintained — 0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0 |
| 0/5 | Packaging — no data |
| 0/5 | Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
| 0/5 | SAST — SAST tool is not run on all commits -- score normalized to 0 |
| 0/5 | Security-Policy — security policy file not detected |
| 0/7.5 | Signed-Releases — no data |
| 0/7.5 | Token-Permissions — detected GitHub workflow tokens with excessive permissions |
| 0/7.5 | Vulnerabilities — 17 existing vulnerabilities detected |
Inputs used
| source | openssf_scorecard |
| checks_evaluated | 16 |
| scorecard_version | v5.5.0 |
| checks_inconclusive | 2 |
| scorecard_aggregate | 2.5 |
Excluded from scoring (no data or not applicable): packaging, signed_releases. Remaining weights renormalized.
Dependency advisories
100Excellent
How it's scored
| 35/35 | Direct dependencies free of known advisories — no direct dependency carries a known advisory |
| 0/25 | Indirect dependencies free of known advisories — transitive set not separable from development and test dependencies in this scope |
| 0/40 | No advisories left outstanding — no advisory carries a publication date |
Inputs used
| source | osv |
| advisories | 18 |
| affected_packages | 10 |
| assessed_packages | 154 |
| unassessed_packages | 0 |
| affected_by_severity | critical 1, high 7, moderate 1, low 1 |
| direct_affected_packages | 0 |
Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 154 resolved dependencies against OSV. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. Reachability is not analyzed.
AI Readiness
How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score.
15
Agent context & guidance
3Critical
How it's scored
| 0/45 | Agent instructions — no CLAUDE.md / AGENTS.md / editor rules |
| 0/15 | Machine-readable docs (llms.txt) |
| 2.7/40 | Legible commit history — 2 of 40 human commits state their intent (structured subject or explanatory body) |
Inputs used
| has_llms_txt | no |
| legible_history_share | 0.05 |
| agent_instruction_files | — |
| agent_instruction_max_bytes | — |
Verify loop (build / test / typecheck)
10Critical
How it's scored
| 0/18 | One-command bootstrap |
| 0/22 | Automated tests |
| 0/11 | Lint / format config |
| 0/11 | Static type checking |
| 10/10 | Reproducible environment — lockfile |
| 0/10 | Demonstrated agent practice — no agent-authored commits among the last 40 |
| 0/8 | Automated maintenance — no automated dependency updates observed |
| 0/10 | OpenSSF Scorecard: Pinned-Dependencies — dependency not pinned by hash detected -- score normalized to 0 |
Inputs used
| has_nix | no |
| has_tests | no |
| lockfiles | package-lock.json |
| has_dockerfile | no |
| typed_language | no |
| bootstrap_files | — |
| has_devcontainer | no |
| has_linter_config | no |
| typecheck_configs | — |
| agent_commit_share | 0 |
| toolchain_manifests | — |
| dependency_bot_commit_share | 0 |
Code legibility for models
55Moderate
How it's scored
| 0/45 | Type-checkable code — JavaScript without a type-check config |
| 55/55 | Manageable file sizes — 0/3 source files over 60KB |
Inputs used
| primary_language | JavaScript |
| largest_source_bytes | 38,838 |
| source_files_sampled | 3 |
| oversized_source_files | 0 |
Key facts
715GitHub stars
4contributors
0commits, last 12 months
1,160days since last push
0releases
1bus factor
2open issues
npmpackage ecosystems
Data collection warnings
- Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token
More detail
Star and fork history 0 ★ / 48 ⇿
0Stars
48Forks
When each star and fork was added, collected from GitHub and bucketed by day. Cumulative growth sits directly above the daily additions it is made of, so the two read against each other: steady organic accretion looks nothing like an abrupt, short-lived burst. Where that difference is measurable, it is reported as growth authenticity.
Each point covers 11 days.
OpenSSF Scorecard 2.5 / 10
2.5aggregate
Independent, tool-agnostic security assessment from the open-source OpenSSF Scorecard. Each check rewards a security practice, not a specific vendor's tool. Checks Scorecard could not determine are marked n/a and excluded from the security score (never counted as zero).
| 10 | Binary-Artifacts | no binaries found in the repo |
| 0 | Branch-Protection | branch protection not enabled on development/release branches |
| 0 | CI-Tests | 0 out of 4 merged PRs checked by a CI test -- score normalized to 0 |
| 0 | CII-Best-Practices | no effort to earn an OpenSSF best practices badge detected |
| 1 | Code-Review | Found 3/23 approved changesets -- score normalized to 1 |
| 10 | Contributors | project has 7 contributing companies or organizations |
| 10 | Dangerous-Workflow | no dangerous workflow patterns detected |
| 0 | Dependency-Update-Tool | no update tool detected |
| 0 | Fuzzing | project is not fuzzed |
| 10 | License | license file detected |
| 0 | Maintained | 0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0 |
| n/a | Packaging | packaging workflow not detected |
| 0 | Pinned-Dependencies | dependency not pinned by hash detected -- score normalized to 0 |
| 0 | SAST | SAST tool is not run on all commits -- score normalized to 0 |
| 0 | Security-Policy | security policy file not detected |
| n/a | Signed-Releases | no releases found |
| 0 | Token-Permissions | detected GitHub workflow tokens with excessive permissions |
| 0 | Vulnerabilities | 17 existing vulnerabilities detected |
All dependencies 154
Full resolved dependency set from the GitHub dependency graph: 0 direct and 154 indirect (transitive) packages. The transitive closure is complete when the repository commits a lockfile.
| Registry | Package | Version | Relation |
|---|---|---|---|
| npm | @ampproject/remapping | 2.2.1 | indirect |
| npm | @babel/code-frame | 7.21.4 | indirect |
| npm | @babel/compat-data | 7.21.4 | indirect |
| npm | @babel/core | 7.21.4 | indirect |
| npm | @babel/generator | 7.21.4 | indirect |
| npm | @babel/helper-compilation-targets | 7.21.4 | indirect |
| npm | @babel/helper-environment-visitor | 7.18.9 | indirect |
| npm | @babel/helper-function-name | 7.21.0 | indirect |
| npm | @babel/helper-hoist-variables | 7.18.6 | indirect |
| npm | @babel/helper-module-imports | 7.21.4 | indirect |
| npm | @babel/helper-module-transforms | 7.21.2 | indirect |
| npm | @babel/helper-simple-access | 7.20.2 | indirect |
| npm | @babel/helper-split-export-declaration | 7.18.6 | indirect |
| npm | @babel/helper-string-parser | 7.19.4 | indirect |
| npm | @babel/helper-validator-identifier | 7.19.1 | indirect |
| npm | @babel/helper-validator-option | 7.21.0 | indirect |
| npm | @babel/helpers | 7.21.0 | indirect |
| npm | @babel/highlight | 7.18.6 | indirect |
| npm | @babel/parser | 7.21.4 | indirect |
| npm | @babel/template | 7.20.7 | indirect |
| npm | @babel/traverse | 7.21.4 | indirect |
| npm | @babel/types | 7.21.4 | indirect |
| npm | @istanbuljs/load-nyc-config | 1.1.0 | indirect |
| npm | @istanbuljs/schema | 0.1.3 | indirect |
| npm | @jridgewell/gen-mapping | 0.3.3 | indirect |
| npm | @jridgewell/resolve-uri | 3.1.0 | indirect |
| npm | @jridgewell/set-array | 1.1.2 | indirect |
| npm | @jridgewell/sourcemap-codec | 1.4.14 | indirect |
| npm | @jridgewell/sourcemap-codec | 1.4.15 | indirect |
| npm | @jridgewell/trace-mapping | 0.3.18 | indirect |
| npm | aggregate-error | 3.1.0 | indirect |
| npm | ansi-regex | 5.0.1 | indirect |
| npm | ansi-styles | 3.2.1 | indirect |
| npm | ansi-styles | 4.3.0 | indirect |
| npm | append-transform | 2.0.0 | indirect |
| npm | archy | 1.0.0 | indirect |
| npm | argparse | 1.0.10 | indirect |
| npm | balanced-match | 1.0.2 | indirect |
| npm | brace-expansion | 1.1.11 | indirect |
| npm | browserslist | 4.21.5 | indirect |
| npm | caching-transform | 4.0.0 | indirect |
| npm | camelcase | 5.3.1 | indirect |
| npm | caniuse-lite | 1.0.30001478 | indirect |
| npm | chalk | 2.4.2 | indirect |
| npm | clean-stack | 2.2.0 | indirect |
| npm | cliui | 6.0.0 | indirect |
| npm | color-convert | 1.9.3 | indirect |
| npm | color-convert | 2.0.1 | indirect |
| npm | color-name | 1.1.3 | indirect |
| npm | color-name | 1.1.4 | indirect |
| npm | commondir | 1.0.1 | indirect |
| npm | concat-map | 0.0.1 | indirect |
| npm | convert-source-map | 1.9.0 | indirect |
| npm | cross-spawn | 7.0.3 | indirect |
| npm | debug | 4.3.4 | indirect |
| npm | decamelize | 1.2.0 | indirect |
| npm | default-require-extensions | 3.0.1 | indirect |
| npm | electron-to-chromium | 1.4.365 | indirect |
| npm | emoji-regex | 8.0.0 | indirect |
| npm | es6-error | 4.1.1 | indirect |
| npm | escalade | 3.1.1 | indirect |
| npm | escape-string-regexp | 1.0.5 | indirect |
| npm | esprima | 4.0.1 | indirect |
| npm | find-cache-dir | 3.3.2 | indirect |
| npm | find-up | 4.1.0 | indirect |
| npm | foreground-child | 2.0.0 | indirect |
| npm | fromentries | 1.3.2 | indirect |
| npm | fs.realpath | 1.0.0 | indirect |
| npm | gensync | 1.0.0-beta.2 | indirect |
| npm | get-caller-file | 2.0.5 | indirect |
| npm | get-package-type | 0.1.0 | indirect |
| npm | glob | 7.2.3 | indirect |
| npm | globals | 11.12.0 | indirect |
| npm | graceful-fs | 4.2.11 | indirect |
| npm | has-flag | 3.0.0 | indirect |
| npm | has-flag | 4.0.0 | indirect |
| npm | hasha | 5.2.2 | indirect |
| npm | html-escaper | 2.0.2 | indirect |
| npm | imurmurhash | 0.1.4 | indirect |
| npm | indent-string | 4.0.0 | indirect |
| npm | inflight | 1.0.6 | indirect |
| npm | inherits | 2.0.4 | indirect |
| npm | is-fullwidth-code-point | 3.0.0 | indirect |
| npm | is-stream | 2.0.1 | indirect |
| npm | is-typedarray | 1.0.0 | indirect |
| npm | is-windows | 1.0.2 | indirect |
| npm | isexe | 2.0.0 | indirect |
| npm | istanbul-lib-coverage | 3.2.0 | indirect |
| npm | istanbul-lib-hook | 3.0.0 | indirect |
| npm | istanbul-lib-instrument | 4.0.3 | indirect |
| npm | istanbul-lib-processinfo | 2.0.3 | indirect |
| npm | istanbul-lib-report | 3.0.0 | indirect |
| npm | istanbul-lib-source-maps | 4.0.1 | indirect |
| npm | istanbul-reports | 3.1.5 | indirect |
| npm | js-tokens | 4.0.0 | indirect |
| npm | js-yaml | 3.14.1 | indirect |
| npm | jsesc | 2.5.2 | indirect |
| npm | json5 | 2.2.3 | indirect |
| npm | locate-path | 5.0.0 | indirect |
| npm | lodash | 4.17.21 | indirect |
| npm | lodash.flattendeep | 4.4.0 | indirect |
| npm | lru-cache | 5.1.1 | indirect |
| npm | make-dir | 3.1.0 | indirect |
| npm | minimatch | 3.1.2 | indirect |
| npm | ms | 2.1.2 | indirect |
| npm | node-preload | 0.2.1 | indirect |
| npm | node-releases | 2.0.10 | indirect |
| npm | nyc | 15.1.0 | indirect |
| npm | once | 1.4.0 | indirect |
| npm | p-limit | 2.3.0 | indirect |
| npm | p-locate | 4.1.0 | indirect |
| npm | p-map | 3.0.0 | indirect |
| npm | p-try | 2.2.0 | indirect |
| npm | package-hash | 4.0.0 | indirect |
| npm | path-exists | 4.0.0 | indirect |
| npm | path-is-absolute | 1.0.1 | indirect |
| npm | path-key | 3.1.1 | indirect |
| npm | picocolors | 1.0.0 | indirect |
| npm | pkg-dir | 4.2.0 | indirect |
| npm | process-on-spawn | 1.0.0 | indirect |
| npm | release-zalgo | 1.0.0 | indirect |
| npm | require-directory | 2.1.1 | indirect |
| npm | require-main-filename | 2.0.0 | indirect |
| npm | resolve-from | 5.0.0 | indirect |
| npm | rimraf | 3.0.2 | indirect |
| npm | seedrandom | 3.0.5 | indirect |
| npm | semver | 6.3.0 | indirect |
| npm | set-blocking | 2.0.0 | indirect |
| npm | shebang-command | 2.0.0 | indirect |
| npm | shebang-regex | 3.0.0 | indirect |
| npm | signal-exit | 3.0.7 | indirect |
| npm | source-map | 0.6.1 | indirect |
| npm | spawn-wrap | 2.0.0 | indirect |
| npm | sprintf-js | 1.0.3 | indirect |
| npm | string-width | 4.2.3 | indirect |
| npm | strip-ansi | 6.0.1 | indirect |
| npm | strip-bom | 4.0.0 | indirect |
| npm | supports-color | 5.5.0 | indirect |
| npm | supports-color | 7.2.0 | indirect |
| npm | test-exclude | 6.0.0 | indirect |
| npm | to-fast-properties | 2.0.0 | indirect |
| npm | type-fest | 0.8.1 | indirect |
| npm | typedarray-to-buffer | 3.1.5 | indirect |
| npm | update-browserslist-db | 1.0.10 | indirect |
| npm | uuid | 8.3.2 | indirect |
| npm | which | 2.0.2 | indirect |
| npm | which-module | 2.0.0 | indirect |
| npm | wrap-ansi | 6.2.0 | indirect |
| npm | wrappy | 1.0.2 | indirect |
| npm | write-file-atomic | 3.0.3 | indirect |
| npm | y18n | 4.0.3 | indirect |
| npm | yallist | 3.1.1 | indirect |
| npm | yargs | 15.4.1 | indirect |
| npm | yargs-parser | 18.1.3 | indirect |
Dependency advisories 10
This repository publishes no package the index resolves, so its own dependency graph was assessed — 154 packages, which also include development and test pins that never ship: 10 carry known advisories, of which 0 are direct.
| Package | Version | Relation | Severity | Advisories | Fixed in |
|---|---|---|---|---|---|
| @babel/traverse | 7.21.4 | indirect | critical | 1 | 8.0.0-alpha.4 |
| brace-expansion | 1.1.11 | indirect | high | 3 | 5.0.7 |
| cross-spawn | 7.0.3 | indirect | high | 1 | 7.0.5 |
| js-yaml | 3.14.1 | indirect | high | 3 | 4.3.0 |
| lodash | 4.17.21 | indirect | high | 3 | 4.18.0 |
| minimatch | 3.1.2 | indirect | high | 3 | 10.2.3 |
| semver | 6.3.0 | indirect | high | 1 | 7.5.2 |
| uuid | 8.3.2 | indirect | high | 1 | 13.0.1 |
| @babel/helpers | 7.21.0 | indirect | moderate | 1 | 8.0.0-alpha.17 |
| @babel/core | 7.21.4 | indirect | low | 1 | 8.0.0-rc.6 |
An advisory means the version recorded in the dependency graph falls inside an advisory’s affected range. Reachability is not analysed, and the graph includes development and test pins — a finding may concern tooling rather than shipped software.
Raw JSON report machine-readable
{
"data": {
"repo": {
"topics": [],
"is_fork": false,
"size_kb": 75,
"has_wiki": true,
"homepage": null,
"languages": {
"JavaScript": 50518
},
"pushed_at": "2023-05-19T08:25:10Z",
"created_at": "2014-10-03T07:12:03Z",
"owner_type": "User",
"updated_at": "2026-06-17T09:30:18Z",
"description": "A fast Javascript string diff",
"is_archived": false,
"is_disabled": false,
"license_spdx": "Apache-2.0",
"default_branch": "master",
"license_spdx_raw": "Apache-2.0",
"primary_language": "JavaScript",
"significant_languages": [
"JavaScript"
]
},
"owner": {
"blog": "https://slab.com",
"name": "Jason Chen",
"type": "User",
"login": "jhchen",
"company": "@slab ",
"location": "San Francisco, CA",
"followers": 624,
"avatar_url": "https://avatars.githubusercontent.com/u/192974?v=4",
"created_at": "2010-01-30T18:22:10Z",
"is_verified": null,
"public_repos": 12,
"account_age_days": 6017
},
"license": {
"state": "standard",
"spdx_id": "Apache-2.0",
"raw_spdx": "Apache-2.0",
"file_present": true,
"scorecard_found": true,
"profile_has_license": true
},
"activity": {
"releases": [],
"recent_commits": [
{
"oid": "0e27223f8792083f5a49a193eb1ddbf26125fdb2",
"body": null,
"is_bot": false,
"headline": "Update README.md",
"author_name": "Zihua Li",
"author_login": "luin",
"committed_at": "2023-05-19T08:25:10Z",
"body_truncated": false,
"is_coding_agent": false
},
{
"oid": "9d9d5dd6d77e12ceb171e8463667535adf13f3bb",
"body": null,
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"has_linter_config": false,
"has_precommit_config": false
},
"security_signals": {
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"scorecard": {
"checks": [
{
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"score": 10,
"reason": "no binaries found in the repo",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#binary-artifacts"
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{
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"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#branch-protection"
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{
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"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#ci-tests"
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{
"name": "CII-Best-Practices",
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"reason": "no effort to earn an OpenSSF best practices badge detected",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#cii-best-practices"
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{
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"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#code-review"
},
{
"name": "Contributors",
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"reason": "project has 7 contributing companies or organizations",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#contributors"
},
{
"name": "Dangerous-Workflow",
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"reason": "no dangerous workflow patterns detected",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#dangerous-workflow"
},
{
"name": "Dependency-Update-Tool",
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"reason": "no update tool detected",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#dependency-update-tool"
},
{
"name": "Fuzzing",
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"reason": "project is not fuzzed",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#fuzzing"
},
{
"name": "License",
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"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#license"
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{
"name": "Maintained",
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"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#maintained"
},
{
"name": "Packaging",
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"reason": "packaging workflow not detected",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#packaging"
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{
"name": "Pinned-Dependencies",
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"reason": "dependency not pinned by hash detected -- score normalized to 0",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#pinned-dependencies"
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{
"name": "SAST",
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"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#sast"
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{
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"reason": "security policy file not detected",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#security-policy"
},
{
"name": "Signed-Releases",
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"reason": "no releases found",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#signed-releases"
},
{
"name": "Token-Permissions",
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"reason": "detected GitHub workflow tokens with excessive permissions",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#token-permissions"
},
{
"name": "Vulnerabilities",
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"reason": "17 existing vulnerabilities detected",
"documentation_url": "https://github.com/ossf/scorecard/blob/c395761df6afe1a69e476bc60a013a94bcbc153f/docs/checks.md#vulnerabilities"
}
],
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"oldest_open_prs": [
{
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],
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{
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"last_comment_author": null
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{
"number": 26,
"created_at": "2025-08-01T21:45:03Z",
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"last_comment_author": null
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]
}
},
"config": {
"disabled_metrics": [],
"disabled_categories": [],
"disabled_components": {}
},
"source": {
"url": "https://github.com/jhchen/fast-diff",
"host": "github.com",
"name": "fast-diff",
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"metrics": {
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"key": "overall",
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"note": null,
"notes": [],
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"inputs": {
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"community": 69,
"governance": 53,
"engineering": 34
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"components": []
},
"categories": [
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"metrics": [
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"human_commit_share": 1,
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"active_weeks_last_year": 0
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"components": [
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{
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"status": "missed",
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"key": "openssf_scorecard_maintained",
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"points": 0,
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{
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"notes": [
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"inputs": {
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"components": [
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{
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},
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],
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"metrics": [
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"inputs": {
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"components": [
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],
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{
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}
],
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{
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],
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]
},
{
"key": "community_health",
"band": "moderate",
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"note": null,
"notes": [],
"value": 50,
"inputs": {
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"has_issue_template": false,
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"has_pull_request_template": false
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"components": [
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"status": "met",
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{
"key": "license",
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"status": "met",
"details": [
{
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{
"code": "license_spdx",
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],
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"points": 0,
"status": "missed",
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{
"key": "code_of_conduct",
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"detail": null,
"points": 0,
"status": "missed",
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{
"key": "issue_template",
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"points": 0,
"status": "missed",
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{
"key": "pr_template",
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"status": "missed",
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]
},
{
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"inputs": {
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],
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{
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"status": "excluded",
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],
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{
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"metrics": [
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"components": [
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"status": "partial",
"details": [
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}
],
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{
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{
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"status": "partial",
"details": [
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],
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{
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]
},
{
"key": "responsiveness",
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"notes": [],
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"inputs": {
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"components": [
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],
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{
"key": "pr_acceptance",
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"status": "partial",
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]
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{
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"notes": [
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"value": 63,
"inputs": {
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"components": [
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{
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],
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]
},
{
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"notes": [],
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"inputs": {
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"components": [
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"status": "met",
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],
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{
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"status": "partial",
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],
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],
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"metrics": [
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{
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"points": 0,
"status": "missed",
"details": [],
"max_points": 16
},
{
"key": "pre_commit_hooks",
"name": "Pre-commit hooks",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 9.6
},
{
"key": "editorconfig",
"name": ".editorconfig",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 6.4
},
{
"key": "openssf_scorecard_ci_tests",
"name": "OpenSSF Scorecard: CI-Tests",
"detail": "0 out of 4 merged PRs checked by a CI test -- score normalized to 0",
"points": 0,
"status": "missed",
"details": [],
"max_points": 20
}
]
},
{
"key": "documentation",
"band": "moderate",
"name": "Documentation",
"note": null,
"notes": [],
"value": 50,
"inputs": {
"topics": [],
"has_wiki": true,
"homepage": null,
"has_readme": true,
"has_docs_dir": false,
"has_description": true
},
"components": [
{
"key": "readme",
"name": "README",
"detail": null,
"points": 30,
"status": "met",
"details": [],
"max_points": 30
},
{
"key": "documentation_directory",
"name": "Documentation directory",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 25
},
{
"key": "documentation_homepage_site",
"name": "Documentation / homepage site",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 15
},
{
"key": "repository_description",
"name": "Repository description",
"detail": null,
"points": 10,
"status": "met",
"details": [],
"max_points": 10
},
{
"key": "topics",
"name": "Topics",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 10
},
{
"key": "wiki",
"name": "Wiki",
"detail": null,
"points": 10,
"status": "met",
"details": [],
"max_points": 10
}
]
}
],
"description": "Are baseline engineering and documentation practices in place?"
},
{
"key": "security",
"band": "at_risk",
"name": "Security",
"value": 40,
"weight": 0.16,
"metrics": [
{
"key": "security_posture",
"band": "critical",
"name": "Security posture",
"note": "Excluded from scoring (no data or not applicable): Packaging, Signed-Releases. Remaining weights renormalized.",
"notes": [
{
"code": "excluded_no_data",
"params": {
"components": [
"packaging",
"signed_releases"
]
}
},
{
"code": "weights_renormalized",
"params": {}
}
],
"value": 25,
"inputs": {
"source": "openssf_scorecard",
"checks_evaluated": 16,
"scorecard_version": "v5.5.0",
"checks_inconclusive": 2,
"scorecard_aggregate": 2.5
},
"components": [
{
"key": "binary_artifacts",
"name": "Binary-Artifacts",
"detail": "no binaries found in the repo",
"points": 7.5,
"status": "met",
"details": [],
"max_points": 7.5
},
{
"key": "branch_protection",
"name": "Branch-Protection",
"detail": "branch protection not enabled on development/release branches",
"points": 0,
"status": "missed",
"details": [],
"max_points": 7.5
},
{
"key": "ci_tests",
"name": "CI-Tests",
"detail": "0 out of 4 merged PRs checked by a CI test -- score normalized to 0",
"points": 0,
"status": "missed",
"details": [],
"max_points": 2.5
},
{
"key": "cii_best_practices",
"name": "CII-Best-Practices",
"detail": "no effort to earn an OpenSSF best practices badge detected",
"points": 0,
"status": "missed",
"details": [],
"max_points": 2.5
},
{
"key": "code_review",
"name": "Code-Review",
"detail": "Found 3/23 approved changesets -- score normalized to 1",
"points": 0.8,
"status": "partial",
"details": [],
"max_points": 7.5
},
{
"key": "contributors",
"name": "Contributors",
"detail": "project has 7 contributing companies or organizations",
"points": 2.5,
"status": "met",
"details": [],
"max_points": 2.5
},
{
"key": "dangerous_workflow",
"name": "Dangerous-Workflow",
"detail": "no dangerous workflow patterns detected",
"points": 10,
"status": "met",
"details": [],
"max_points": 10
},
{
"key": "dependency_update_tool",
"name": "Dependency-Update-Tool",
"detail": "no update tool detected",
"points": 0,
"status": "missed",
"details": [],
"max_points": 7.5
},
{
"key": "fuzzing",
"name": "Fuzzing",
"detail": "project is not fuzzed",
"points": 0,
"status": "missed",
"details": [],
"max_points": 5
},
{
"key": "license",
"name": "License",
"detail": "license file detected",
"points": 2.5,
"status": "met",
"details": [],
"max_points": 2.5
},
{
"key": "maintained",
"name": "Maintained",
"detail": "0 commit(s) and 0 issue activity found in the last 90 days -- score normalized to 0",
"points": 0,
"status": "missed",
"details": [],
"max_points": 7.5
},
{
"key": "packaging",
"name": "Packaging",
"detail": "packaging workflow not detected",
"points": 0,
"status": "excluded",
"details": [
{
"code": "no_data",
"params": {}
}
],
"max_points": 5
},
{
"key": "pinned_dependencies",
"name": "Pinned-Dependencies",
"detail": "dependency not pinned by hash detected -- score normalized to 0",
"points": 0,
"status": "missed",
"details": [],
"max_points": 5
},
{
"key": "sast",
"name": "SAST",
"detail": "SAST tool is not run on all commits -- score normalized to 0",
"points": 0,
"status": "missed",
"details": [],
"max_points": 5
},
{
"key": "security_policy",
"name": "Security-Policy",
"detail": "security policy file not detected",
"points": 0,
"status": "missed",
"details": [],
"max_points": 5
},
{
"key": "signed_releases",
"name": "Signed-Releases",
"detail": "no releases found",
"points": 0,
"status": "excluded",
"details": [
{
"code": "no_data",
"params": {}
}
],
"max_points": 7.5
},
{
"key": "token_permissions",
"name": "Token-Permissions",
"detail": "detected GitHub workflow tokens with excessive permissions",
"points": 0,
"status": "missed",
"details": [],
"max_points": 7.5
},
{
"key": "vulnerabilities",
"name": "Vulnerabilities",
"detail": "17 existing vulnerabilities detected",
"points": 0,
"status": "missed",
"details": [],
"max_points": 7.5
}
]
},
{
"key": "dependency_advisories",
"band": "excellent",
"name": "Dependency advisories",
"note": "Excluded from scoring (no data or not applicable): Indirect dependencies free of known advisories, No advisories left outstanding. Remaining weights renormalized. Matched 154 resolved dependencies against OSV. This repository publishes no package the index resolves, so the repository dependency graph was assessed instead. That graph mixes development and test pins with shipped dependencies, so only the declared runtime dependencies are scored; transitive findings are reported as context and excluded from the score. Reachability is not analyzed.",
"notes": [
{
"code": "excluded_no_data",
"params": {
"components": [
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"no_advisories_left_outstanding"
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}
},
{
"code": "weights_renormalized",
"params": {}
},
{
"code": "advisories_scope_repository",
"params": {
"assessed": 154
}
},
{
"code": "advisories_repo_graph_caveat",
"params": {}
},
{
"code": "advisories_reachability",
"params": {}
}
],
"value": 100,
"inputs": {
"source": "osv",
"advisories": 18,
"affected_packages": 10,
"assessed_packages": 154,
"unassessed_packages": 0,
"affected_by_severity": "critical 1, high 7, moderate 1, low 1",
"direct_affected_packages": 0
},
"components": [
{
"key": "direct_dependencies_free_of_known_advisories",
"name": "Direct dependencies free of known advisories",
"detail": "no direct dependency carries a known advisory",
"points": 35,
"status": "met",
"details": [
{
"code": "no_direct_advisories",
"params": {}
}
],
"max_points": 35
},
{
"key": "indirect_dependencies_free_of_known_advisories",
"name": "Indirect dependencies free of known advisories",
"detail": "transitive set not separable from development and test dependencies in this scope",
"points": 0,
"status": "excluded",
"details": [
{
"code": "advisories_scope_not_separable",
"params": {}
}
],
"max_points": 25
},
{
"key": "no_advisories_left_outstanding",
"name": "No advisories left outstanding",
"detail": "no advisory carries a publication date",
"points": 0,
"status": "excluded",
"details": [
{
"code": "advisories_no_publication_date",
"params": {}
}
],
"max_points": 40
}
]
},
{
"key": "malicious_dependencies",
"band": "excellent",
"name": "Malicious dependencies",
"note": null,
"notes": [],
"value": 100,
"inputs": {
"source": "osv",
"meaning": "reported as a malicious package by the OpenSSF corpus; the remedy is removal or moving off the compromised name, never an upgrade of the same artifact. Versions the registry has since pulled are listed but not scored",
"packages": [],
"red_flag": false,
"assessed_packages": 154,
"malicious_packages": 0,
"direct_malicious_packages": 0,
"withdrawn_malicious_packages": 0,
"installable_malicious_packages": 0
},
"components": [
{
"key": "no_dependency_reported_as_a_malicious_package",
"name": "No dependency reported as a malicious package",
"detail": "no dependency is reported as a malicious package",
"points": 100,
"status": "met",
"details": [
{
"code": "no_malicious_dependencies",
"params": {}
}
],
"max_points": 100
}
]
},
{
"key": "high_risk_jurisdiction_exposure",
"band": "excellent",
"name": "High-Risk Jurisdiction Exposure",
"note": "Only high-confidence self-published location evidence affects this multiplier. Ambiguous matches are review-only; country evidence is not proof of nationality, citizenship, legal registration, malicious intent, or sanctions status.",
"notes": [
{
"code": "jurisdiction_evidence_limits",
"params": {}
}
],
"value": 100,
"inputs": {
"meaning": "self-published location evidence; not nationality or citizenship",
"red_flag": false,
"exposures": [],
"policy_countries": [
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"Iran",
"North Korea"
],
"review_only_matches": 0,
"assessed_self_published_locations": 9
},
"components": [
{
"key": "policy_exposure_multiplier",
"name": "Policy exposure multiplier",
"detail": "no confirmed policy-scope location match",
"points": 100,
"status": "met",
"details": [
{
"code": "jurisdiction_no_match",
"params": {}
}
],
"max_points": 100
}
]
}
],
"description": "Are visible security and supply-chain practices strong, with no malicious dependency and no unresolved high-risk jurisdiction exposure?"
},
{
"key": "ai_readiness",
"band": "critical",
"name": "AI Readiness",
"value": 15,
"weight": 0,
"metrics": [
{
"key": "ai_agent_context",
"band": "critical",
"name": "Agent context & guidance",
"note": null,
"notes": [],
"value": 3,
"inputs": {
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"legible_history_share": 0.05,
"agent_instruction_files": [],
"agent_instruction_max_bytes": null
},
"components": [
{
"key": "agent_instructions",
"name": "Agent instructions",
"detail": "no CLAUDE.md / AGENTS.md / editor rules",
"points": 0,
"status": "missed",
"details": [
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"code": "no_agent_instructions",
"params": {}
}
],
"max_points": 45
},
{
"key": "machine_readable_docs_llms_txt",
"name": "Machine-readable docs (llms.txt)",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 15
},
{
"key": "legible_commit_history",
"name": "Legible commit history",
"detail": "2 of 40 human commits state their intent (structured subject or explanatory body)",
"points": 2.7,
"status": "partial",
"details": [
{
"code": "legible_history",
"params": {
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"sampled": 40
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],
"max_points": 40
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]
},
{
"key": "ai_verify_loop",
"band": "critical",
"name": "Verify loop (build / test / typecheck)",
"note": null,
"notes": [],
"value": 10,
"inputs": {
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"has_tests": false,
"lockfiles": [
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"has_dockerfile": false,
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"bootstrap_files": [],
"has_devcontainer": false,
"has_linter_config": false,
"typecheck_configs": [],
"agent_commit_share": 0,
"toolchain_manifests": [],
"dependency_bot_commit_share": 0
},
"components": [
{
"key": "one_command_bootstrap",
"name": "One-command bootstrap",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 18
},
{
"key": "automated_tests",
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"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 22
},
{
"key": "lint_format_config",
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"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 11
},
{
"key": "static_type_checking",
"name": "Static type checking",
"detail": null,
"points": 0,
"status": "missed",
"details": [],
"max_points": 11
},
{
"key": "reproducible_environment",
"name": "Reproducible environment",
"detail": "lockfile",
"points": 10,
"status": "met",
"details": [
{
"code": "file_list",
"params": {
"files": "lockfile"
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}
],
"max_points": 10
},
{
"key": "demonstrated_agent_practice",
"name": "Demonstrated agent practice",
"detail": "no agent-authored commits among the last 40",
"points": 0,
"status": "missed",
"details": [
{
"code": "no_agent_authored_commits",
"params": {
"sampled": 40
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}
],
"max_points": 10
},
{
"key": "automated_maintenance",
"name": "Automated maintenance",
"detail": "no automated dependency updates observed",
"points": 0,
"status": "missed",
"details": [
{
"code": "no_dependency_automation",
"params": {}
}
],
"max_points": 8
},
{
"key": "openssf_scorecard_pinned_dependencies",
"name": "OpenSSF Scorecard: Pinned-Dependencies",
"detail": "dependency not pinned by hash detected -- score normalized to 0",
"points": 0,
"status": "missed",
"details": [],
"max_points": 10
}
]
},
{
"key": "ai_code_legibility",
"band": "moderate",
"name": "Code legibility for models",
"note": null,
"notes": [],
"value": 55,
"inputs": {
"primary_language": "JavaScript",
"largest_source_bytes": 38838,
"source_files_sampled": 3,
"oversized_source_files": 0
},
"components": [
{
"key": "type_checkable_code",
"name": "Type-checkable code",
"detail": "JavaScript without a type-check config",
"points": 0,
"status": "missed",
"details": [
{
"code": "no_typecheck_config_language",
"params": {
"language": "JavaScript"
}
}
],
"max_points": 45
},
{
"key": "manageable_file_sizes",
"name": "Manageable file sizes",
"detail": "0/3 source files over 60KB",
"points": 55,
"status": "met",
"details": [
{
"code": "oversized_source_files",
"params": {
"kb": 60,
"sampled": 3,
"oversized": 0
}
}
],
"max_points": 55
}
]
}
],
"description": "How well is the repo equipped to be developed and maintained with AI coding agents? An independent, experimental badge — weight 0.0, so it is surfaced on its own and does not affect the overall health score."
}
],
"metrics_version": "1.13.0"
},
"warnings": [
"Star history unavailable: GitHub GraphQL error: Resource not accessible by personal access token"
],
"report_type": "repository",
"generated_at": "2026-07-22T23:30:31.528003Z",
"schema_version": "0.27.0",
"badge_url": "https://raw.githubusercontent.com/inspect-software/badges/main/v1/j/jhchen/fast-diff.svg",
"full_name": "jhchen/fast-diff",
"license_state": "standard",
"license_spdx": "Apache-2.0"
}Scores are signals, not warranties. They reflect publicly visible practices on GitHub — not a code audit, and not a security guarantee.
Missing data is excluded and weights renormalized, never scored as zero. Methodology is versioned and open: metrics v1.13.0, schema v0.27.0 — full methodology · metrics wiki.
How one result sits in the wider record: aggregate statistics — npm.