Go
fxamacker/cbor
CBOR codec (RFC 8949, RFC 8742) with CBOR tags, Go struct tag options (toarray, keyasint, omitempty, omitzero), float64/32/16, big.Int, and fuzz tested.
MITSep 14, 2026 · metrics 2.10.0
All tags
Catalogue tag
#json-alternative
Every repository in the public record carrying this tag — from its GitHub topics or the keywords its package registries publish. Health is measured under the same versioned methodology as the rest of the record.
9 records
PyPI · crates.io · npm +1
ISON-format/ison
🔥 Token-efficient JSON alternative for LLMs & agentic AI — same data, fewer tokens. Python · JS/TS · Rust · Go · C++
MITSep 30, 2026 · metrics 2.10.0
Go
blackwell-systems/gcf-go
GCF Go implementation. 100% LLM comprehension on every frontier model. 50-92% fewer tokens than JSON. 43B+ round-trips verified. Zero dependencies.
Apache-2.0Oct 20, 2026 · metrics 2.10.0
crates.io · Go
dweve-ai/hedl
Token-efficient data serialization for LLM/AI. 50% fewer tokens than JSON, 93% better value/token. Rust, schema validation, LSP.
Apache-2.0Sep 19, 2026 · metrics 2.10.0
Packagist · npm
mischasigtermans/laravel-toon
TOON encoding for Laravel. Encode data for AI/LLMs with ~50% fewer tokens than JSON.
MITSep 13, 2026 · metrics 2.10.0
PyPI
blackwell-systems/gcf-python
GCF Python implementation. 100% LLM comprehension on every frontier model. 50-92% fewer tokens than JSON. 43B+ round-trips verified. Zero dependencies.
Apache-2.0Oct 3, 2026 · metrics 2.10.0
NuGet
CharlesHunt/ToonDotNet
This is a conversion of the ToonFormat/Toon repo to C#
MITSep 15, 2026 · metrics 2.10.0
npm
blackwell-systems/gcf-typescript
GCF TypeScript implementation. 100% LLM comprehension on every frontier model. 50-92% fewer tokens than JSON. 43B+ round-trips verified. Zero dependencies.
MITSep 18, 2026 · metrics 2.10.0
PyPI · Go
blackwell-systems/gcf-proxy
MCP proxy: zero-code GCF adoption. Wraps any MCP server, converts JSON to GCF mid-flight. 53-71% fewer tokens. Works with any structured data.
Apache-2.0Oct 20, 2026 · metrics 2.10.0