#mock

SNS/SQS/S3 emulator written in TypeScript

A pytest plugin powered by VCR.py to record and replay HTTP traffic.

Open-source OpenAPI mock server with cloud hosting and local modes for development, testing, and CI. Generates realistic API responses from specs with latency simulation, error injection, proxy fallback, and request validation. Validated against 2,200+ real-world OpenAPI specs.

Supabase Auth, Realtime, RPC client written in Rust

A liteweight fetch wrapper with plugins support and similar API to axios.

kiri-aws — a single-binary AWS emulator with a billing time machine. Local AWS services + Cost Explorer, drop-in for the AWS SDKs, CLI, and Terraform.

kiri — a single-binary Google Cloud emulator. 108 GCP services on one local endpoint, real SDK / gcloud / Terraform compatible, with a cost surface.

A mocking library based on the Compiler APIs (Roslyn + Mocks)

LLM Simulation for Load Testing

Development tools for Apps in Toss (앱인토스) mini-apps — mock SDK, floating devtools panel, and universal bundler plugin

Mock OpenTelemetry OTLP collector for testing Rust applications

:last_quarter_moon: A module used to mock canvas in Jest.

JSON-Schema + fake data generators

🏝 automated contract testing via type checking for Elixir functions and mocks

Package generico para sistema de pagos/suscrpciones

A simulation platform for use during testing, during development and for high-fidelity application previews

Generate mock code all at once

CLI for the Imposter mock engine, a scriptable, multipurpose mock server.

A comprehensive library with full Telegram Bot API type support

.NET abstraction over cloud file storage providers (S3, Azure, GCS, OCI) using streams and ASP.NET Core DI

Get a full fake REST API with zero coding in less than 30 seconds (seriously)

A cross-platform abstract/virtual filesystem framework with many built-ins filesystems for .NET

Mocking and spying in Ruby's MiniTest framework

simulates and mock media devices like webcams in web applications

A modern PHP test double library that puts developer experience first.

:heavy_check_mark: PHP Test Framework for Freedom, Truth, and Justice

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🕵🏻‍♂️ minimal fork of nanospy, with more features

🌗 A module used to mock canvas in Vitest. All credits goes to the original author of jest-canvas-mock.