KONTESTS
Programming
For upcoming and ongoing competitive coding contests
No keyHTTPS
Free Programming APIs
Free public APIs for programming, each one verified and kept up to date.
5 listed · 1 need no key · 1 work in the browser
Judge0 CE
Programming
Online code execution system
API keyCORSHTTPS
Codeforces
Programming
Get access to Codeforces data
API keyHTTPS
Hackerearth
Programming
For compiling and running code in several languages
API keyHTTPS
Mintlify
Programming
For programmatically generating documentation for code
API keyHTTPS
All 5 Programming APIs
Free Programming APIs — common questions
Counts and timings below come from our own scheduled checks of this category.
How many free programming APIs are there?
We track 5 in this category, of which 4 responded at our last check. 1 of them need no API key.
Which programming APIs work without an API key?
1 of the 5 entries here need no credential. Filter this page by "no key" to see them, or browse the no-key collection for every keyless API across all categories.
Can I use these programming APIs in a browser app?
None of the entries in this category currently combine no-key access with CORS headers, so you will need a small server-side proxy to use them from browser JavaScript.
How do you know these APIs still work?
We call every listing on a schedule and record the status code, response time and whether CORS headers came back. Those results drive the badges on this page. Across the whole catalogue, 487 of 2,712 entries were not responding at the last full run, which is the sort of thing an unchecked list never tells you.