Best Programming APIs in 2026
The top 5 of 5 free Programming APIs, ranked by how easy they are to start with (API key, HTTPS, CORS), how reliable they are in our daily health checks, and what developers rate them. Mintlify API takes the top spot.
Last tested Oct 24, 2026 · Rankings update daily
Ranking
- 1
Mintlify API
Online · 1227 msFor programmatically generating documentation for code.
- Callable from the browser (CORS)
- HTTPS
apiKeyHTTPSCORS - 2
Judge0 CE API
Online · 596 msOnline code execution system. A free programming API by Judge0 CE.
- HTTPS
apiKeyHTTPSCORS ? - 3
- 4
Hackerearth API
Online · 1521 msFor compiling and running code in several languages.
- HTTPS
apiKeyHTTPSCORS ? - 5
KONTESTS API
Last check failedFor upcoming and ongoing competitive coding contests.
- No API key needed
- HTTPS
No authHTTPSCORS ?
Programming APIs compared
| API | API key | HTTPS | CORS | Uptime | Response | Rating |
|---|---|---|---|---|---|---|
| Required | Yes | Yes | Up | 1227 ms | Not rated | |
| Required | Yes | Unknown | Up | 596 ms | Not rated | |
| Required | Yes | Unknown | Up | 479 ms | Not rated | |
| Hackerearth | Required | Yes | Unknown | Up | 1521 ms | Not rated |
| KONTESTS | No | Yes | Unknown | Down | – | Not rated |
More Programming APIs
Best Programming API FAQ
What is the best free Programming API in 2026?
Based on access, reliability and developer ratings, the top free Programming APIs right now are Mintlify API, Judge0 CE API and Codeforces API. Mintlify API ranks first. Rankings update daily from health checks of all 5 Programming APIs in the directory.
What is the best Programming API without an API key?
KONTESTS API need no API key, so you can call them without signing up. 1 of the 5 ranked Programming APIs are keyless.
Which Programming API works from the browser?
Mintlify API support CORS over HTTPS, so front-end JavaScript can call them directly without a proxy.
How are these APIs ranked?
Each API gets a score from: no API key (+), HTTPS (+), CORS support (+), 30-day uptime and response time from our daily health checks, and ratings from developers on this site. APIs that failed three checks in a row are left out until they recover.