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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.
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AppSignal
Monitoring that respects your time & budget. APM, error tracking, and dashboards for modern web apps. Ten-minute setup, transparent flat pricing, and support from engineers who actually use the product.
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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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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: API Testing in Practice: Automating Postman Collections with Newman | dev.to | 2026-07-09
https://github.com/postmanlabs/newman (the runner itself — clone it to see its own test suite structure as a reference for organizing a Newman-driven project)
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Kargo
Stop Scripting Promotions. Start Shipping with Kargo. Kargo automates promotion across dev, staging, and prod with approval gates and verification. Open source, built by the team behind Argo CD. Download now.
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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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https://kroki.io/#try
Shout out to Kroki, which offers Mermaid and many other text-based diagramming formats.
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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
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node-oracledb
Oracle Database driver for Node.js maintained by Oracle Corporation. Connect your JavaScript and TypeScript applications instantly to Oracle Database.
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lad
Node.js framework made by a former @expressjs TC and @koajs team member. Built for @forwardemail, @spamscanner, @breejs, @cabinjs, and @lassjs.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
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).
JavaScript API discussion
JavaScript API related posts
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Three small API-backed actors I've shipped recently (Docker Hub, lead extraction, SEC Form 4)
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Pull contents from any page via API and avoid Same-origin policy problems
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The Nodebook
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Serverless Without Limits: How a Static Web App Can Fully Operate with Databases
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API Testing in Practice: Automating Postman Collections with Newman
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Show HN: Free Mermaid Diagram Editor
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OpenAPI Specs automatisch in saubere Markdown-Doku konvertieren
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A note from our sponsor - AppSignal
www.appsignal.com | 12 Sep 2026
Index
What are some of the best open-source API projects in JavaScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | one-api | 36,853 |
| 2 | whatsapp-web.js | 22,517 |
| 3 | JSDoc | 15,457 |
| 4 | css.gg | 10,037 |
| 5 | no-as-a-service | 7,969 |
| 6 | Newman | 7,251 |
| 7 | miniprogram-demo | 7,222 |
| 8 | postcat | 5,542 |
| 9 | kroki | 4,323 |
| 10 | node-chatgpt-api | 4,159 |
| 11 | Chartbrew | 4,056 |
| 12 | lib | 3,819 |
| 13 | freeDictionaryAPI | 3,584 |
| 14 | react-refetch | 3,398 |
| 15 | google-translate-api | 3,123 |
| 16 | nodejs-docs-samples | 2,993 |
| 17 | google-play-scraper | 2,960 |
| 18 | apisauce | 2,886 |
| 19 | Swagger Client | 2,694 |
| 20 | aimeos-headless | 2,571 |
| 21 | active-forks | 2,422 |
| 22 | node-oracledb | 2,367 |
| 23 | lad | 2,287 |
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