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Advanced HTTP API toolkit — no-code ML testing, AI docs and code generation.
★ 2.2k starsApache-2.0
View guide →Judge0 is a robust, scalable, open-source online code execution system with a simple HTTP API
judge0 is an open-source dev tools project by judge0 (judge0/judge0 on GitHub). It has 4,461 GitHub stars and 940 forks, is released under the GPL-3.0 license, and was last updated on GitHub on 30 September 2026.
Pick the flavor whose language set matches the languages you need to run.
Follow the README's installation guide to self-host, or sign up for the managed service.
Use raw HTTP from any language, or the official Python SDK.
POST source code to the submissions endpoint and read back status, stdout, and timing.
Create submissions with a POST and poll (or use ?wait=true) for results — language-agnostic by design.
Untrusted code is compiled and run in a sandbox with configurable time and memory limits.
Multi-file programs, additional files, custom compiler options and command-line arguments.
Status, stdout/stderr, compile output, time, and memory for every run.
Get notified when submissions finish instead of polling.
A maintained judge0 package on PyPI wraps the API for Python applications.
Clone the project and enter its directory.
git clone https://github.com/judge0/judge0.git
cd judge0Follow the self-hosting installation guide linked from the README to bring the API up on your machine.
# see the installation guide linked from the README for the exact commandsFrom Python, install the SDK and run a snippet against your instance or the cloud.
pip install judge0
import judge0
result = judge0.run(source_code="print('hello')", language=judge0.Python)Judge0 was created by Herman Zvonimir Došilović in 2016 and is maintained as an open-source project, with a managed cloud offered at judge0.com.
The self-hosted system is GPL-3.0 open source. A hosted cloud version is also available for those who don't want to run infrastructure.
Self-hosted Judge0 needs no key. The managed cloud is a separate service with its own access arrangements.
Judge0 gives you the whole execution platform — queueing, sandboxing, limits, result reporting, and webhooks — behind one API, instead of building and securing that pipeline yourself.
Follow the installation guide linked from the README to self-host, or `pip install judge0` and run your first submission against an instance.
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