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Top 23 JavaScript API Projects
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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.
In the Chinese ecosystem the same role is played by new-api and one-api, which add key distribution and billing on top — useful when you need to resell or meter access across a team.
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SaaSHub
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whatsapp-web.js
A WhatsApp client library for NodeJS that connects through the WhatsApp Web browser app
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In our JSDoc comments we describe our endpoints to using a set of tags, you can look at the different tags and what they do over on JSDoc's website but here's what we've used and why.
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SpaceX-API
:rocket: Open Source REST API for SpaceX launch, rocket, core, capsule, starlink, launchpad, and landing pad data.
Project mention: I Built a SpaceX Launch Tracker in 50 Lines of Python (No API Key Needed) | dev.to | 2026-03-25The SpaceX REST API is completely free, requires no authentication, and returns beautifully structured JSON about every launch since 2006.
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artillery
The complete load testing platform. Everything you need for production-grade load tests. Serverless & distributed. Load test with Playwright. Load test HTTP APIs, GraphQL, WebSocket, and more. Use any Node.js module.
My simple ab tests? Yeah, they were totally not enough! For high-stakes events like flash sales, really thorough load testing is just non-negotiable. Period. Now, I make sure to incorporate more robust tools like k6 or Artillery into my pre-launch checklist for any client project that’s expecting a lot of traffic. These tools can simulate thousands of concurrent users, which is awesome for spotting bottlenecks *before* they ever hit production. Trust me, it's worth every bit of effort!
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no-as-a-service
No-as-a-Service (NaaS) is a simple API that returns a random rejection reason. Use it when you need a realistic excuse, a fun “no,” or want to simulate being turned down in style.
Project mention: Integrating no-as-a-service in Linux kernel code | news.ycombinator.com | 2026-05-10 -
Project mention: Best API Monitoring Tools in 2026: What Developers Actually Use | dev.to | 2026-06-13
Postman Monitors turn your existing Postman collections into scheduled API checks. If your team already uses Postman for API development and testing, monitors let you reuse those collections — complete with pre-request scripts, test assertions, and environment variables — as production monitoring without rewriting anything.
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postcat
Postcat 是一个可扩展的 API 工具平台。集合基础的 API 管理和测试功能，并且可以通过插件简化你的 API 开发工作，让你可以更快更好地创建 API。An extensible API tool.
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Kroki — Universal gateway to 20+ diagram engines (D2, Graphviz, BPMN, Structurizr...)
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node-chatgpt-api
A client implementation for ChatGPT and Bing AI. Available as a Node.js module, REST API server, and CLI app.
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Chartbrew
Open-source reporting platform to build and share live dashboards from APIs, SQL and NoSQL databases, with powerful AI assistant, scheduling, and embeddable charts 📈📊
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freeDictionaryAPI
There was no free Dictionary API on the web when I wanted one for my friend, so I created one.
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aimeos-headless
Aimeos cloud-native, API-first ecommerce headless distribution based on Laravel for ultra fast online shops, scalable marketplaces, complex B2B applications and #gigacommerce
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
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A note from our sponsor - SaaSHub
www.saashub.com | 17 Jun 2026
Index
What are some of the best open-source API projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | one-api | 34,868 |
| 2 | whatsapp-web.js | 22,009 |
| 3 | JSDoc | 15,439 |
| 4 | SpaceX-API | 10,854 |
| 5 | css.gg | 9,996 |
| 6 | node-telegram-bot-api | 9,167 |
| 7 | artillery | 8,996 |
| 8 | no-as-a-service | 7,798 |
| 9 | Newman | 7,227 |
| 10 | miniprogram-demo | 7,188 |
| 11 | postcat | 5,551 |
| 12 | kroki | 4,190 |
| 13 | node-chatgpt-api | 4,178 |
| 14 | Chartbrew | 3,946 |
| 15 | lib | 3,823 |
| 16 | freeDictionaryAPI | 3,486 |
| 17 | react-refetch | 3,401 |
| 18 | google-translate-api | 3,112 |
| 19 | nodejs-docs-samples | 2,972 |
| 20 | google-play-scraper | 2,887 |
| 21 | apisauce | 2,886 |
| 22 | Swagger Client | 2,693 |
| 23 | aimeos-headless | 2,535 |
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