api-mocking

🐙 Multi-armed mocks for LLM apps - Drop-in replacement for OpenAI/Anthropic APIs for deterministic testing

Mock OpenAI and Anthropic APIs locally for fast, deterministic tests.

Instantly generate mock REST APIs powered by LLMs (GPT/Gemini). Just describe your endpoint—MockGen does the rest. Docker-ready, fast, and open source.

Agent skill for stateful OpenAPI mock servers

Mock API server generated from OpenAPI specs for local development and testing

基于 mitmproxy 的 HTTP(S) 代理：UI 自动化测试中的请求拦截与改写。支持 Mock、域名重写、按 IP 激活场景；CLI、REST API 与 Agent Skills。

Mocks, MCP tools and conformance tests generated from NVIDIA DSX AsyncAPI/OpenAPI specs (dsx-exchange, infra-controller) with Microcks and reShapr. CI runs the conformance PoCs; PoC 1 and 2 are local runs.

Point any security product at a full enterprise: 300 assets, 500 people, seven vendor APIs that disagree on purpose. Then score what it concluded against ground truth.

Generate full-featured REST APIs from Pydantic models in seconds. Zero config, type-safe mock API server for testing and prototyping.

🧞 AI Mock API Genie is an intelligent API mocking tool that revolutionizes how developers create realistic test environments. Unlike traditional mock tools that generate random data, it captures real API responses, uses AI (Anthropic Claude/OpenAI) to understand patterns and generates contextually appropriate mock data for complex domains

A lightweight, local Mock server built on FastAPI. Dynamically generate realistic REST APIs from OpenAPI specs with Faker data, CRUD state, and Chaos Engineering.

High-fidelity digital twin of Facebook Login (OAuth 2.0 + Graph API) — develop against it, switch to the real API by changing the hostname. Part of twins.la

Cross-platform HTTPS proxy interceptor (macOS, Windows, Linux) — redirect, block, and mock requests with a web UI. Selective MITM: only rule-targeted hosts are intercepted, everything else is a blind TCP tunnel.

Lightweight HTTP mock server configured via YAML for quick API client testing

Local-first CLI for mocking HTTP APIs with YAML, JSON, and CSV-backed datasets

An API for generating and monitoring satellite telemetry and alerts in real-time.

High-fidelity digital twin of the Anthropic Messages API — develop against it, switch to the real API by changing the hostname. Part of twins.la

⚡ Zero-dependency local API mocking & chaos fault injection engine built with Python standard library. Features sub-15ms startup, latency jitter simulation, zero-downtime hot-reloading, and live P99 latency telemetry.

Mock Spotify API data generator - Export your personal top tracks/artists to JSON for realistic test fixtures, demo data, and local development without API calls

High-fidelity digital twin of Twilio SMS + SendGrid Email — develop against it, switch to the real API by changing the hostname. Part of twins.la