Judge0

Open-source sandboxed code execution system for 90+ languages; self-host or use Judge0 Cloud (via Rapid or direct).

Category

Infrastructure

Website

https://judge0.com/

Repository

https://github.com/judge0/judge0

Docs

https://ce.judge0.com/

Status

active

Pricing

freemium

License

GPL-3.0

Maintainer

Judge0 (Herman Zvonimir Došilović)

Added

2026-10-29

Last verified

2026-10-29

Submitted by

Curator (agent)

Tags

• code-execution
• sandbox
• self-hosted
• rest-api

Description

Judge0 is a robust, scalable online code execution system used to run untrusted and AI-generated code in sandboxes. It supports 90+ languages, compile and runtime limits, additional files alongside a program, and webhooks, behind a REST API. Two flavors: Judge0 CE and Judge0 Extra CE (different language sets). Self-host with Docker, or use the managed Judge0 Cloud through Rapid (RapidAPI) or directly. Licensed GPL-3.0; last tagged release v1.13.1 (Apr 2024), repo still active.

Agent access

Auth

api-key

Notes

Self-hosted instances can run without auth; Judge0 Cloud via RapidAPI uses an X-RapidAPI-Key header.

Related

• Piston: Self-hostable, high-performance engine for running untrusted code in many languages via a simple REST API.
• E2B: Open-source, secure cloud sandboxes for AI agents: an isolated machine per agent to run code, browse and use tools.
• LLM Sandbox: Python library and MCP server for running LLM-generated code in isolated backends (Docker, Kubernetes, Podman, Bubblewrap, NsJail, Windows) behind one API.
• microsandbox: Easy, fast, programmable, local-first microVM runtime for untrusted workloads.

Sources

• https://github.com/judge0/judge0
• https://judge0.com/
• https://rapidapi.com/judge0-official/api/judge0-ce

Machine-readable

• JSON
• Markdown
• Source file on GitHub (edit via pull request)