judge0: a robust and scalable sandboxed online code execution system for humans and AI

What it solves

Judge0 provides a secure, scalable way to execute untrusted code online. It eliminates the need for developers to build their own complex sandboxing infrastructure when creating applications that require running user-submitted or AI-generated code, such as online IDEs, competitive programming sites, or AI agents.

How it works

Judge0 is a modular online code execution system that exposes a simple HTTP JSON API. Users send source code, language identifiers, and optional inputs (stdin) to the API, and Judge0 compiles and executes the code within a secure sandbox. It supports over 90 languages and frameworks, allowing for multi-file projects and custom compiler options, memory limits, and time limits. It can be deployed as a self-hosted instance or used as a managed SaaS.

Who it’s for

It is designed for developers building AI agents, e-learning platforms, candidate recruitment tools, online code editors, and competitive programming platforms.

Highlights

• Support for 90+ programming languages.
• Sandboxed execution to safely run untrusted code.
• Simple integration via HTTP JSON API or an official Python SDK.
• Scalable architecture capable of handling high loads.
• Support for multi-file programs and custom execution limits.