API Client GitHub Repositories

Open-Source API Development Ecosystem • https://hoppscotch.io • Offline, On-Prem & Cloud • Web, Desktop & CLI • Open-Source Alternative to Postman, Insomnia

Opensource IDE For Exploring and Testing API's (lightweight alternative to Postman/Insomnia)

The open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE and gRPC. With Cloud, Local and Git storage.

🥧 HTTPie CLI — modern, user-friendly command-line HTTP client for the API era. JSON support, colors, sessions, downloads, plugins & more.

OpenAPI Generator allows generation of API client libraries (SDK generation), server stubs, documentation and configuration automatically given an OpenAPI Spec (v2, v3)

Scalar is an open-source API platform:　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　🌐 Modern REST API Client　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　📖 Beautiful API References　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　✨ 1st-Class OpenAPI/Swagger Support

Build product integrations with AI.

A free, open-source developer workspace. Snippets, notes, HTTP requests, calculations, and dev tools in one local-first app.

Community hub for Requestly API Client — bugs, feature requests, and roadmap. The privacy-first Postman alternative.

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 fully open source and available for commercial use.

Official Notion JavaScript Client

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

🚀 HTTPie Desktop — cross-platform API testing client for humans. Painlessly test REST, GraphQL, and HTTP APIs.

:books: A collection of useful resources for building RESTful HTTP+JSON APIs.

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

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

A simple API client (postman like) in your terminal

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

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

DummyJSON.com provides different types of REST Endpoints filled with JSON data which you can use in developing the frontend with your favorite framework and library without worrying about writing a backend.

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 your HTTP & GraphQL API requests, visually inspect responses and generate API integration code. A lightweight alternative to postman/insomnia.

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

Developer-first OpenSource API DevTool, Postman/Insomnia alternative.

Use Hugging Face with JavaScript

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

Insomnia Mockbin is the underlying backend for the API mocks capability of Insomnia. It is built and used by Kong, the author of the open-source Kong Gateway.

Messaging APIs for multi-platform

A very simple Salesforce.com REST API client for Python

Automated API Testing and Quality Assurance

Terminal API client for HTTP/GraphQL/gRPC with support for SSH tunnels, WebSockets, SSE, Workflows, Profiling, OpenAPI, Kubernetes port-forwarding, CLI and mocks.