Codeforces
Programming
Get access to Codeforces data
API keyHTTPS
Judge0 CE
Online code execution system
Verified 4 days ago: 100% uptime
API key
Required
HTTPS
Supported
Browser calls
Yes, CORS enabled
Status
Live · 100/100
What our checks found
- Health score
- 100/100
- Reliability
- 100%
- Average latency
- 709ms
Last checked 2026-09-18. Measured independently, not self-reported by the provider.
How to call it
A starting template for Judge0 CE. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.
# Requires an API key. Check the docs for whether it goes in a header or a query parameter.
curl -s "https://ce.judge0.com/ENDPOINT" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Accept: application/json"Where this listing comes from
Aggregated from one public source (public-apis), then normalised and checked by us. If something here is wrong, tell us and we will correct it.
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Judge0 CE — common questions
Answered from what our own scheduled checks found, not from the provider's marketing.
Is Judge0 CE free to use?
Judge0 CE is listed in our free catalogue, but it requires an API key, so you will need to register before your first call. Providers frequently reserve higher limits and commercial use for paid plans.
Does Judge0 CE need an API key?
Yes. Judge0 CE authenticates with an API key. Keep it server-side rather than in browser code, because anything in your frontend bundle is readable by anyone who opens developer tools.
Can I call Judge0 CE from browser JavaScript?
Yes. Judge0 CE returned CORS headers when we checked it, so a browser will let your page read the response. You can fetch it directly from client-side JavaScript with no proxy and no backend.
Is Judge0 CE still working?
Yes, as of 2026-09-18. Our automated check reached Judge0 CE and recorded a 100% reliability score with a median response time of 709 ms. We re-check on a schedule, and this page updates with the result.
Is Judge0 CE available over HTTPS?
Yes. Judge0 CE serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.