I've been exploring free APIs for the past 2 weeks and documenting every useful one I find.
Some of my favorites so far:
- arXiv API — Search 2M+ research papers, no key needed
- PyPI JSON API — Get metadata on any Python package instantly
- npm Registry API — Discover packages by keyword, zero auth
- Libraries.io — Track 8M+ packages across 40+ platforms
- Hacker News API — Real-time tech news via Firebase
But I know there are MANY more hidden gems out there.
What's a free API you've used that most developers don't know about?
Bonus points if:
- No API key required
- Returns JSON
- Has a genuinely useful dataset
I'm collecting these into a comprehensive list on GitHub and would love to add your suggestions (with credit!).
Related articles if you want to see code examples:
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