Open Source API Development & Testing Tools

fastapi ★ 105K

FastAPI framework, high performance, easy to learn, fast to code, ready for production

Hoppscotch ★ 81K

Sleek, intuitive API development and testing platform

Bruno ★ 48K

Lightweight, fast, and open-source API client for developers

Insomnia ★ 40K

Powerful API development and testing made effortless

one-api ★ 37K

LLM API 管理 & 分发系统，支持 OpenAI、Azure、Anthropic Claude、Google Gemini、DeepSeek、字节豆包、ChatGLM、文心一言、讯飞星火、通义千问、360 智脑、腾讯混元等主流模型，统一 API 适配，可用于 key 管理与二次分发。单可执行文件，提供 Docke

OpenAPI-Specification ★ 31K

The OpenAPI Specification Repository

openapi-generator ★ 27K

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec

redoc ★ 26K

📘 OpenAPI/Swagger-generated API Reference Documentation

SafeLine ★ 23K

SafeLine is a self-hosted WAF(Web Application Firewall) / reverse proxy to protect your web apps from attacks and exploits.

Mobile-Security-Framework-MobSF ★ 22K

Mobile Security Framework (MobSF) is an automated, all-in-one mobile application (Android/iOS/Windows) pen-testing, malware analysis and security assessment fra

grpc-gateway ★ 20K

gRPC to JSON proxy generator following the gRPC HTTP spec

Yaak ★ 19K

Fast, secure, offline API client with Git integration

hurl ★ 19K

Hurl, run and test HTTP requests with plain text.

Apache APISIX ★ 17K

High-performance API gateway with built-in LLM support

Scalar ★ 16K

Open-source API documentation and testing platform

swag ★ 13K

Automatically generate RESTful API documentation with Swagger 2.0 for Go.

fastapi_mcp ★ 12K

Expose your FastAPI endpoints as Model Context Protocol (MCP) tools, with Auth!

Tyk ★ 11K

Universal API management for REST, GraphQL, gRPC & async

higress ★ 9.7K

🤖 AI Gateway | AI Native API Gateway

django-ninja ★ 9.2K

💨 Fast, Async-ready, Openapi, type hints based framework for building APIs

api-platform ★ 9.2K

🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.

karate ★ 9.0K

Test Automation Made Simple

shenyu ★ 8.9K

Apache ShenYu is a Java native API Gateway for service proxy, protocol conversion and API governance.

Ocelot ★ 8.7K

.NET API Gateway

litestar ★ 8.5K

Light, flexible and extensible ASGI framework | Built to scale

Mockoon ★ 8.5K

Effortless API mocking for seamless development

openapi-typescript ★ 8.4K

Generate TypeScript types from OpenAPI 3 specs

xh ★ 8.2K

Friendly and fast tool for sending HTTP requests

Tailcall ★ 7.6K

The modern GraphQL runtime

swagger-core ★ 7.5K

Examples and server integrations for generating the Swagger API Specification, which enables easy access to your REST API

wiremock ★ 7.4K

A tool for mocking HTTP services

NSwag ★ 7.4K

The Swagger/OpenAPI toolchain for .NET, ASP.NET Core and TypeScript.

gpt-load ★ 7.2K

Self-hosted AI gateway for multi-channel, multi-credential setups — API keys and subscription accounts, scheduling, failover, request logs and usage. 自托管 AI 网关：

aws-sam-cli ★ 6.7K

CLI tool to build, test, debug, and deploy Serverless applications using AWS SAM

RWKV-Runner ★ 6.5K

A RWKV management and startup tool, full automation, only 8MB. And provides an interface compatible with the OpenAI API. RWKV is a large language model that is

open-connector ★ 6.2K

Open-source auth gateway connecting 1500+ SaaS providers to AI agents through SDK, CLI, MCP, HTTP, and OpenAPI.

goa ★ 6.1K

Design-first Go framework that generates API code, documentation, and clients. Define once in an elegant DSL, deploy as HTTP and gRPC services with zero drift b

typia ★ 6.0K

Super-fast/easy runtime validators and serializers via transformation

cypress-realworld-app ★ 5.9K

A payment application to demonstrate real-world usage of Cypress testing methods, patterns, and workflows.

easegress ★ 5.9K

A Cloud Native traffic orchestration system. (CNCF Project)

agentgateway ★ 5.9K

Next Generation Agentic Proxy for AI Agents and MCP servers

orpc ★ 5.7K

Typesafe APIs Made Simple 🪄

kgateway ★ 5.7K

The Cloud-Native API Gateway and AI Gateway

notion-sdk-js ★ 5.7K

Official Notion JavaScript Client

hey-api ★ 5.6K

👨‍🚀 Turn API specifications into production-ready SDKs, validators, mocks, and more. 20+ plugins. Millions of weekly npm downloads. Used by Vercel, OpenCode,

axonhub ★ 5.4K

⚡️ Open-source AI Gateway — Use any SDK to call 100+ LLMs. Built-in failover, load balancing, cost control & end-to-end tracing.

serverless-express ★ 5.3K

Run Express and other Node.js frameworks on AWS Serverless technologies such as Lambda, API Gateway, Lambda@Edge, and more.

go-restful ★ 5.1K

package for building REST-style Web Services using Go

mockserver-monorepo ★ 5.0K

MockServer is an HTTP(S) mock server and proxy for testing that lets you mock APIs, inspect and modify live traffic, and inject failures. It supports HTTP/1.1,

spring-cloud-gateway ★ 4.9K

An API Gateway built on Spring Framework and Spring Boot providing routing and more.

cli-printing-press ★ 4.9K

Every API has a secret identity. This finds it, absorbs every feature from every competing tool, then builds the GOAT CLI — designed for AI agents first, with S

autorest ★ 4.8K

OpenAPI (f.k.a Swagger) Specification code generator. Supports C#, PowerShell, Go, Java, Node.js, TypeScript, Python

Integuru ★ 4.8K

The first AI agent that builds permissionless integrations through reverse engineering platforms' internal APIs.

mcp-context-forge ★ 4.7K

An AI Gateway, registry, and proxy that sits in front of any MCP, A2A, or REST/gRPC APIs, exposing a unified endpoint with centralized discovery, guardrails and

prest ★ 4.6K

PostgreSQL ➕ REST, low-code, simplify and accelerate development, ⚡ instant, realtime, high-performance on any Postgres application, existing or new, MCP server

connexion ★ 4.6K

Connexion is a modern Python web framework that makes spec-first and api-first development easy.

emissary ★ 4.5K

open source Kubernetes-native API gateway for microservices built on the Envoy Proxy

mcpo ★ 4.4K

A simple, secure MCP-to-OpenAPI proxy server

optillm ★ 4.3K

Optimizing inference proxy for LLMs

octelium ★ 4.1K

A next-gen FOSS self-hosted unified zero trust secure access platform that can operate as a remote access VPN, a ZTNA platform, API/AI/MCP gateway, a PaaS, an n

HTTPie ★ 4.1K

Modern command-line HTTP client for the API era

datamodel-code-generator ★ 4.0K

Generate Pydantic v2 models, dataclasses, TypedDict, and msgspec.Struct from OpenAPI, JSON Schema, GraphQL, Avro, Protobuf, and raw JSON/YAML/CSV.

claudia ★ 3.9K

Deploy Node.js projects to AWS Lambda and API Gateway easily

nba_api ★ 3.9K

An API Client package to access the APIs for NBA.com

kiota ★ 3.8K

OpenAPI based HTTP Client code generator

ATAC ★ 3.7K

A simple API client (postman like) in your terminal

springdoc-openapi ★ 3.7K

Library for OpenAPI 3 with spring-boot

php-crud-api ★ 3.7K

Single file PHP script that adds a REST API to a SQL database

schemathesis ★ 3.7K

Catch API bugs before your users do

curlie ★ 3.7K

The power of curl, the ease of use of httpie.

Zappa ★ 3.7K

Serverless Python

kubernetes-client ★ 3.7K

Java client for Kubernetes & OpenShift

light-4j ★ 3.7K

A fast, lightweight and more productive microservices framework

tailchat ★ 3.6K

Next generation noIM application in your own workspace, not only another Slack/Discord/Rocket.chat

graphql-mesh ★ 3.5K

🕸️ GraphQL Federation Framework for any API services such as REST, OpenAPI, Swagger, SOAP, gRPC and more...

workbuddy2api-hub ★ 3.4K

WorkBuddy 国际国内多账号反代网关，支持 Codex / Claude Code / DSH与标准 OpenAI 客户端。

openapi-typescript-codegen ★ 3.4K

NodeJS library that generates Typescript or Javascript clients based on the OpenAPI specification

php-curl-class ★ 3.3K

PHP Curl Class makes it easy to send HTTP requests and integrate with web APIs

run-aspnetcore-microservices ★ 3.3K

Microservices on .NET platforms used ASP.NET Web API, Docker, RabbitMQ, MassTransit, Grpc, Yarp API Gateway, PostgreSQL, Redis, SQLite, SqlServer, Marten, Entit

spectral ★ 3.2K

A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x

ruby-openai ★ 3.2K

OpenAI API + Ruby! 🤖❤️ GPT-5 & Realtime WebRTC compatible!

gateway ★ 3.1K

Manages Envoy Proxy as a Standalone or Kubernetes-based Application Gateway

WindsurfAPI ★ 3.1K

Turn Windsurf / Devin Desktop's 100+ AI models (Claude, GPT, Gemini, DeepSeek, Kimi, GLM, SWE) into OpenAI-, Anthropic- & Gemini-compatible APIs. Zero-dependenc

azure-rest-api-specs ★ 3.1K

The source for REST API specifications for Microsoft Azure.

cc-gateway ★ 3.1K

AI API identity gateway — reverse proxy that normalizes device fingerprints and telemetry for privacy-preserving API proxying

zenstack ★ 3.0K

Modern data layer for TypeScript apps - type-safe ORM, built-in access control, automatic query services

apidash ★ 2.9K

API Dash is a beautiful AI-powered open-source cross-platform (Desktop & Mobile) API Client built using Flutter which can help you easily create & customize you

uvicorn-gunicorn-fastapi-docker ★ 2.9K

Docker image with Uvicorn managed by Gunicorn for high-performance FastAPI web applications in Python with performance auto-tuning.

Restfox ★ 2.8K

Offline-First Minimalistic HTTP & Socket Testing Client for the Web & Desktop

metamcp ★ 2.7K

MCP Aggregator, Orchestrator, Middleware, Gateway in one docker

Krakend ★ 2.7K

Blazing-fast API gateway with linear scalability

Firecamp ★ 2.6K

Unified API development ecosystem for modern teams

synctv ★ 2.5K

Synchronized viewing, theater, live streaming, video

elements ★ 2.5K

Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown.

mcp2cli ★ 2.4K

Turn any MCP, OpenAPI, or GraphQL server into a CLI — at runtime, with zero codegen

NelmioApiDocBundle ★ 2.4K

Generates documentation for your REST API from attributes

kiro-gateway ★ 2.3K

👻 Proxy API gateway for Kiro IDE & CLI (Amazon Q Developer / AWS CodeWhisperer). Use free Claude models with any client.

agent-router ★ 2.3K

Manages Unified Access to Generative AI Services built on Envoy Gateway

gnostic ★ 2.3K

A compiler for APIs described by the OpenAPI Specification with plugins for code generation and other API support tasks.

scramble ★ 2.2K

Modern Laravel OpenAPI (Swagger) documentation generator. No PHPDoc annotations required.

api-umbrella ★ 2.2K

Open source API management platform

rswag ★ 2.2K

Seamlessly adds a Swagger to Rails-based API's

notion-sdk-py ★ 2.2K

Notion API client SDK, rewritten in Python! (sync + async)

ogen ★ 2.2K

OpenAPI v3 code generator for go

mangum ★ 2.1K

AWS Lambda support for ASGI applications

WebApiClient ★ 2.1K

A REST API library with better functionality, performance, and scalability than refit

platformatic ★ 2.1K

Platformatic Open Source monorepo!

fusio ★ 2.1K

Self-Hosted API Management for Builders

microcks ★ 2.1K

The open source, cloud native tool for API Mocking and Testing. Microcks is a Cloud Native Computing Foundation incubating project 🚀

bichon ★ 2.1K

Bichon – A lightweight, high-performance Rust email archiver with WebUI

openapi-python-client ★ 2.0K

Generate modern Python clients from OpenAPI

resterm ★ 2.0K

Terminal API client for HTTP, GraphQL and gRPC. Plain .http files you can diff and version, with workflows, mocks, profiling, tracing, OpenAPI import, SSH tunne

swift-openapi-generator ★ 2.0K

Generate Swift client and server code from an OpenAPI document.

openapi-generator-cli ★ 2.0K

A node package wrapper for https://github.com/OpenAPITools/openapi-generator

Voiden ★ 2.0K

Build APIs like code with Git-native workspace

zodios ★ 1.9K

typescript http client and server with zod validation

kpt ★ 1.9K

Automate Kubernetes Configuration Editing

kubb ★ 1.8K

🧡 The meta framework for code generation. Automate OpenAPI to type-safe TypeScript, Zod, and TanStack Query with a modular, plugin-based engine.

APIPark ★ 1.8K

Cloud native, ultra-high performance AI&API gateway, LLM API management, distribution system, open platform, supporting all AI APIs.🦄云原生、超高性能 AI&API网关，LLM API

pythagora ★ 1.8K

Generate automated tests for your Node.js app via LLMs without developers having to write a single line of code.

swagger-jsdoc ★ 1.8K

Generates swagger/openapi specification based on jsDoc comments and YAML files.

dreamfactory ★ 1.8K

DreamFactory is a secure, self-hosted enterprise data access platform that provides governed API access to any data source, connecting enterprise applications a

standard-webhooks ★ 1.8K

The Standard Webhooks specification

AngusTester ★ 1.8K

AI-native software testing platform — one YAML test language covering API, Web, mobile, messaging, data, and LLM scenarios. Self-hostable.

fuego ★ 1.8K

Golang Fuego - Web framework generating OpenAPI 3 spec from source code - Pluggable to existing Gin & Echo APIs

uusec-waf ★ 1.7K

Industry-leading free, high-performance, AI and semantic technology Web Application Firewall and API Security Gateway (WAAP) - UUSEC WAF.

apinto ★ 1.7K

基于golang开发的网关。具有各种插件，可以自行扩展，即插即用。此外，它可以快速帮助企业管理API服务，提高API服务的稳定性和安全性。

WireMock.Net ★ 1.7K

WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java,

zod-to-openapi ★ 1.6K

A library that generates OpenAPI (Swagger) docs from Zod schemas

OpenAPI.NET ★ 1.6K

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents fr

serverless-java-container ★ 1.6K

A Java wrapper to run Spring, Spring Boot, Jersey, and other apps inside AWS Lambda.

redocly-cli ★ 1.5K

⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.

aktools ★ 1.5K

AKTools is an elegant and simple HTTP API library for AKShare, built for AKSharers!

openresty-manager ★ 1.5K

Modern, secure, and elegant server control panel, alternative to OpenResty Edge and Nginx Proxy Manager.

lambda-api ★ 1.5K

Lightweight web framework for your serverless applications

oasdiff ★ 1.4K

OpenAPI Diff and Breaking Changes

DPP ★ 1.4K

C++ Discord API Bot Library - D++ is Lightweight and scalable for small and huge bots!

algoliasearch-client-javascript ★ 1.4K

⚡️ A fully-featured and blazing-fast JavaScript API client to interact with Algolia.

WunderGraph ★ 1.3K

Unify APIs, databases, and services effortlessly

smocker ★ 1.3K

Smocker is a simple and efficient HTTP mock server and proxy

php-vcr ★ 1.2K

Record your test suite's HTTP interactions and replay them during future test runs for fast, deterministic, accurate tests.

CliRelay ★ 1.0K

Self-hosted AI gateway for coding CLIs — one OpenAI/Claude/Gemini/Codex-compatible endpoint, with a multi-tenant web console, request logs, and spend quotas.

product-apim ★ 1.0K

Welcome to the WSO2 API Manager source code! For info on working with the WSO2 API Manager repository and contributing code, click the link below.

pingoo ★ 1.0K

The fast and secure Load Balancer / API Gateway / Reverse Proxy with built-in service discovery, GeoIP, WAF, bot protection and much more - https://pingoo.io

zato ★ 1.0K

ESB, SOA, REST, APIs and Cloud Integrations in Python

aimock ★ 1.0K

Mock everything your AI app talks to — LLM APIs, MCP, A2A, AG-UI, vector DBs, search. One package, one port, zero dependencies.

twitter ★ 950

Twitter API for Laravel 5.5+, 6.x, 7.x & 8.x

macai ★ 936

All-in-one native macOS AI chat application for virtually any AI provider

binance ★ 932

Node.js & JavaScript SDK for Binance REST APIs & WebSockets, with TypeScript & browser support, integration tests, beautification & more.

mockttp ★ 889

Powerful friendly HTTP mock server & proxy library

apisix-docker ★ 871

the docker for Apache APISIX

open-agent-connector ★ 848

Open-source, self-hosted alternative to Composio, Nango, Merge.dev, and Arcade.dev for AI agent integrations. Run GitHub, Slack, Hacker News, and custom HTTP ac

apitest ★ 845

A simple and extensible behavioural testing library for Go. You can use api test to simplify REST API, HTTP handler and e2e tests.

dev-proxy ★ 838

Simulate API failures, throttling, and chaos — all from your command line.

just-api ★ 815

:boom: Test REST, GraphQL APIs

pywikibot ★ 780

A Python library that interfaces with the MediaWiki API. This is a mirror from gerrit.wikimedia.org. Do not submit any patches here. See https://www.mediawiki.o

greenmail ★ 749

Official master for the Greenmail project

resgate ★ 739

A Realtime API Gateway used with NATS to build REST, real time, and RPC APIs, where all your clients are synchronized seamlessly.

chapar ★ 726

Chapar is a simple and easy to use api testing tools aims to help developers to test their api endpoints. it support http and grpc protocols.

algoliasearch-client-php ★ 695

⚡️ A fully-featured and blazing-fast PHP API client to interact with Algolia.

ghapi ★ 687

A delightful and complete interface to GitHub's amazing API

portman ★ 685

Port OpenAPI Specs to Postman Collections, inject test suite and run via Newman 👨🏽‍🚀

httpmock ★ 675

HTTP mocking library for Rust

agent-safe-pipeline ★ 672

An execution-authority gateway for AI agents and APIs. It intercepts consequential HTTP actions, asks Decionis whether they are authorized, and forwards exactly

concord ★ 660

A Discord API wrapper library made in C

rustunnel ★ 659

Self-hosted, secure tunnel server in Rust. Expose local HTTP/HTTPS/TCP/UDP services to the public internet via TLS-encrypted WebSocket. Open-source, pay-as-you-

runn ★ 656

runn is a package/tool for running operations following a scenario.

api-gateway ★ 656

Java-based API Gateway bridging legacy and modern APIs with WSDL-to-OpenAPI, SOAP-to-REST, XML, OAuth2, and GraphQL.

api-firewall ★ 654

Fast and light-weight API proxy firewall for request and response validation by OpenAPI specs.

scalecube-services ★ 639

Microservices library - scalecube-services is a high throughput, low latency reactive microservices library built to scale. It features: API-Gateways, service-d

pactum ★ 621

REST API Testing Tool for all levels in a Test Pyramid

serenity-js ★ 621

A TypeScript-native acceptance testing framework that gives your Playwright Test, WebdriverIO, or Cucumber test suite the architecture it needs to scale.

antirion ★ 609

🕷️ The fastest open-source AI Gateway and LLM Gateway — one binary with built-in console to route, secure, budget and observe every LLM call across OpenAI, Ant

reactive-interaction-gateway ★ 602

Create low-latency, interactive user experiences for stateless microservices.

arex-agent-java ★ 572

Lightweight Java agent for traffic capture and replay, enhancing testing and debugging.

dubbo-go-pixiu ★ 566

Based on the proxy gateway service of dubbo-go, it solves the problem that the external protocol calls the internal Dubbo cluster. At present, it supports HTTP

aws-lambda-fastify ★ 560

Insipired by aws-serverless-express to work with Fastify with inject functionality

node-vault ★ 557

Client for HashiCorp's Vault

aiodocker ★ 538

Python Docker API client based on asyncio and aiohttp

api-bricks-sdk ★ 532

SDKs for CoinAPI & FinFeedAPI

qbittorrent-api ★ 518

Python client implementation for qBittorrent's Web API

bramble ★ 512

A federated GraphQL API gateway

routeros-api-php ★ 511

Mikrotik RouterOS API PHP client for your applications

mocker-api ★ 501

mocker-api that creates mocks for REST APIs. It will be helpful when you try to test your application without the actual REST API server.

Hive ★ 483

Open-source GraphQL federation platform

Gravitee ★ 466

Unified API, event, and AI agent management platform