Public APIs
Public APIs for Developers
Where to find public APIs, how to judge one before you build on it, and five reliable starting points.
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Public APIs
Hand-checked public APIs with endpoints, sample requests, sample responses and the limits you should know before you build.
- 5 resources
- Free, no sign-up
- More added regularly
Public APIs
Data sources, with the caveats included
Endpoints, sample requests and sample responses - plus the rate limits, licensing and auth requirements that decide whether an API fits your project.
Public APIs
Free Weather APIs
Weather data sources with free tiers, compared on keys, limits, forecast range and commercial terms.
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Public APIs
Free Currency APIs
Exchange rate sources with free access, and the difference between reference rates and market rates.
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Public APIs
Free JSON APIs
Sample and real JSON endpoints for prototypes, tutorials, portfolio projects and interface testing.
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Public APIs
Free Image APIs
Photo and placeholder image APIs, with the licensing and attribution rules that come attached.
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Check the terms before the endpoint
Free tiers change. Several well-known public APIs have introduced keys, quotas or commercial restrictions at short notice, and a tutorial written two years ago will not tell you that. Every page here links the provider's own documentation, and every claim about pricing or limits is described as what the documentation said at the time of writing.
The practical checklist is short: read the rate limit, check whether commercial use is allowed, confirm the CORS headers if you intend to call it from the browser, and never put a secret key in front-end code.
Frequently asked questions
How do I find a free public API for my project?
Browse the guides here, check each API for authentication, rate limits and licence terms, and test a sample request before you build on it. Start with APIs that need no key while you prototype.
How do I make my first API request?
Copy the sample request from an API page into your browser, curl or a fetch call in JavaScript, and read the JSON in the response. The page shows a sample response so you know what to expect.