An API can be thought of as an instruction manual for communication between multiple software apparatuses. For example, an API may be used for database communication between web applications. By extracting the implementation and relinquishing data into objects, an API simplifies programming.

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public-apis / public-apis

A collective list of free APIs

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Updated Feb 19, 2026
Python

neovim / neovim

Sponsor

Vim-fork focused on extensibility and usability

c vim api lua neovim nvim text-editor

Updated Mar 17, 2026
Vim Script

fastapi / fastapi

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

Updated Mar 16, 2026
Python

hoppscotch / hoppscotch

Sponsor

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

testing api graphql http vuejs spa tools pwa rest vue rest-api websocket http-client api-client developer-tools api-rest testing-tools api-testing

Updated Mar 17, 2026
TypeScript

typicode / json-server

Sponsor

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

mock api json rest frontend test fake

Updated Mar 15, 2026
JavaScript

ocornut / imgui

Dear ImGui: Bloat-free Graphical User interface for C++ with minimal dependencies

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Updated Mar 16, 2026
C++

strapi / strapi

🚀 Strapi is the leading open-source headless CMS. It’s 100% JavaScript/TypeScript, fully customizable, and developer-first.

Updated Mar 16, 2026
TypeScript

meilisearch / meilisearch

A lightning-fast search engine API bringing AI-powered hybrid search to your sites and applications.

Updated Mar 16, 2026
Rust

mudler / LocalAI

Sponsor

🤖 The free, Open Source alternative to OpenAI, Claude and others. Self-hosted and local-first. Drop-in replacement, running on consumer-grade hardware. No GPU required. Runs gguf, transformers, diffusers and many more. Features: Generate Text, MCP, Audio, Video, Images, Voice Cloning, Distributed, P2P and decentralized inference

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Updated Mar 17, 2026
Go

ccxt / ccxt

A cryptocurrency trading API with more than 100 exchanges in JavaScript / TypeScript / Python / C# / PHP / Go

Updated Mar 16, 2026
Python

trpc / trpc

Sponsor

🧙‍♀️ Move Fast and Break Nothing. End-to-end typesafe APIs made easy.

react api typescript nextjs next prisma

Updated Mar 16, 2026
TypeScript

QuivrHQ / quivr

Opiniated RAG for integrating GenAI in your apps 🧠 Focus on your product rather than the RAG. Easy integration in existing products with customisation! Any LLM: GPT4, Groq, Llama. Any Vectorstore: PGVector, Faiss. Any Files. Anyway you want.

Updated Jul 9, 2025
Python

Kong / insomnia

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

api graphql curl rest-api websockets grpc http-client api-client electron-app api-design

Updated Mar 17, 2026
TypeScript

httpie / cli

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

Updated Dec 17, 2024
Python

chatanywhere / GPT_API_free

Free ChatGPT&DeepSeek API Key，免费ChatGPT&DeepSeek API。免费接入DeepSeek API和GPT4 API，支持 gpt | deepseek | claude | gemini | grok 等排名靠前的常用大模型。

api gemini gpt grok claude chatgpt deepseek

Updated Mar 6, 2026
Python

slatedocs / slate

Beautiful static documentation for your API

api static-site-generator api-documentation slate

Updated Feb 1, 2026

directus / directus

Sponsor

The flexible backend for all your projects 🐰 Turn your DB into a headless CMS, admin panels, or apps with a custom UI, instant APIs, auth & more.

Updated Mar 17, 2026
TypeScript

hasura / graphql-engine

Blazing fast, instant realtime GraphQL APIs on all your data with fine grained access control, also trigger webhooks on database events.

api graphql bigquery postgres haskell sql-server mongodb rest-api graphql-server access-control hasura graphql-api subgraph automatic-api supergraph

Updated Mar 16, 2026
TypeScript

songquanpeng / one-api

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 Docker 镜像，一键部署，开箱即用。LLM API management & key redistribution system, unifying multiple providers under a single API. Single binary, Docker-ready, with an English UI.

api api-gateway proxy gemini openai gpt claude openai-api chatgpt ernie-bot azure-openai-api

Updated Jan 9, 2026
JavaScript

Binaryify / NeteaseCloudMusicApi

网易云音乐 Node.js API service

nodejs javascript api apis neteasecloud cloudmusic

Updated Feb 28, 2024