Open Source APIs

Open source project data

9 APIs in this category
9
APIs listed
8
need no API key (89%)
5
CORS enabled (56%)
8
HTTPS (89%)

This directory lists 9 open source APIs. 4 of them require no API key and support CORS, so you can call them directly from browser JavaScript with no backend and no sign-up. Every entry shows whether it needs authentication, serves over HTTPS and allows cross-origin requests, so you can pick one that fits your stack before you read a single doc page.

Showing 9 of 9 APIs

Countly

Open source web and mobile analytics platform with real-time tracking and event monitoring

Auth: No HTTPS CORS: Unknown

Creative Commons Catalog

Search and explore openly licensed and public domain works using Creative Commons API

Auth: OAuth HTTPS CORS: Yes

Datamuse

Word-finding and related terms query engine for developers

Auth: No HTTPS CORS: Unknown

Drupal.org

Access Drupal.org public data and project information

Auth: No HTTPS CORS: Unknown

Evil Insult Generator

Generate humorous and 'evil' insults through a free API

Auth: No HTTPS CORS: Yes

GitHub Contribution Chart Generator

Generate an image visualization of your GitHub contributions calendar

Auth: No HTTPS CORS: Yes

GitHub ReadMe Stats

Dynamically generate GitHub profile statistics cards for your README

Auth: No HTTPS CORS: Yes

Metabase

Open source business intelligence and analytics platform for data visualization and sharing

Auth: No HTTPS CORS: Yes

Shields

Generate clean and consistent badges (SVG/PNG) for open source projects

Auth: No HTTPS CORS: Unknown

Best Open Source APIs for Developers

An open source API allows developers to query repository data, track project health metrics, access contributor information, and monitor package ecosystems across GitHub, GitLab, and other code hosting platforms.

CodeHelper's curated open source API collection includes APIs covering repository metadata, package registries, contributor analytics, issue tracking, and code search.

What to look for in an open source API

  • Rate limits: GitHub's unauthenticated limit is 60 requests per hour; always authenticate to get the higher 5,000 request limit for production apps.
  • GraphQL support: GitHub and GitLab both offer GraphQL APIs that let you fetch exactly the fields you need in a single request.
  • Webhook events: Subscribe to repository events (push, PR, issue) to build real-time integrations without polling.

How to use this API directory

  1. Browse the curated list of APIs below.
  2. Click any API to visit its documentation.
  3. Check the Auth column to understand what credentials you need.

Whether you are building an open source analytics tool or a developer portfolio tracker, this free curated API directory saves you hours of research.

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