Industry standard API mocking for JavaScript.
Lightweight service virtualization/ API simulation / API mocking tool for developers and testers
HTTP/1.1, HTTP/2 and WebSockets stub server for stubbing distributed web services in Docker and non-containerized environments for integration and contract testing
Build and test APIs easily
High-performance, multi-protocol mock server. HTTP, WebSocket, gRPC, MQTT, SSE, GraphQL, SOAP in one binary.
Dynamic API, S3 & Mail mocking for web, mobile & microservice development.
Build web applications today against the GraphQL APIs of tomorrow.
Your API mocking tool for OpenAPI and AsyncAPI using Go and JavaScript - https://mokapi.io
A tool that enables you to - Generate fake data in formats like JSON, Python, JS, Ruby, PHP and SQL - Mock restful APIs with Bearer authentication without writing a single line of code with a drag and drop interface.
The first fetch/XMLHttpRequest network-mocking library that's actually user-friendly
Enterprise-grade webhook testing suite for developers. Capture, inspect, replay, forward, validate, and mock webhook traffic in real time without tunnels. Includes SSE live streaming, JSON Schema validation, and signature verification for Stripe, GitHub, Shopify, Slack, and custom HMAC workflows.
A versatile Go tool for effortlessly generating mock HTTP APIs for all your needs.
Mock Service Worker Tools (MSW-Tools) is a data Mock tool built based on MSW.JS and Svelte. It is used for data linkage between front and back end interfaces, facilitating developers to perform functional tests in different data and scenarios.
Unified data modeling
A lightweight, specification-first Go API mock server that generates realistic responses from OpenAPI 3.0 specifications.
A powerful fetch mocking library designed specifically for Bun tests
Demo of how to mock API's in Playwright for e2e testing
A lightweight TypeScript library for mocking API endpoints during frontend development. Perfect for developing frontend applications before the backend is ready, or for testing different API scenarios.
🐙 Multi-armed mocks for LLM apps - Drop-in replacement for OpenAI/Anthropic APIs for deterministic testing
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