# Judge0 - Code execution made simple for every business

> Judge0 is a robust open-source online code execution system with an HTTP JSON API for running code in a secure, sandboxed environment. It enables reliable, fast, and scalable execution of code across 60+ programming languages and frameworks, making it a powerful foundation for both human and AI-driven workflows. As an online code execution engine, Judge0 supports competitive programming, e-learning platforms, candidate assessment, recruitment platforms, online IDEs, AI-agents, and autonomous agentic code execution. Its secure sandbox ensures isolation and safety, which is critical for security testing, candidate assessment, interview preparation, and automated evaluation of untrusted or AI-generated code. Judge0’s open-source nature and modular architecture make it extensible, self-hostable, and suitable for both lightweight educational use cases and enterprise-scale deployments. Judge0 is trusted by hundreds of organizations and universities worldwide. Its clients range from startups and online education platforms to established enterprises and academic institutions.

Key Benefits:
- **Open Source & Self-Hostable**: Complete control over your code execution environment
- **Secure Sandboxed Execution**: Isolated environment for safe code execution
- **AI-Ready**: Perfect for AI agents, autonomous code execution, and LLM integrations
- **Enterprise Scale**: Scalable architecture supporting both self-hosted and cloud deployments via Judge0 Cloud platform
- **Multi-Language Support**: Execute code in 60+ programming languages and frameworks

Features:
- RESTful HTTP JSON API for seamless integration
- Online sandboxed compilation and execution environment
- Custom input, compiler options, command-line arguments, and resource limits
- Detailed execution results with stdout, stderr, and compilation output
- Webhooks for asynchronous processing and notifications
- Additional file support alongside user programs
- Quick installation options (self-hosted or cloud)

## Products
- [Judge0](https://judge0.com/): Robust, scalable, open-source API platform for online code execution. Supports 60+ programming languages with sandboxed compilation and execution. Perfect for AI code execution, competitive programming platforms, e-learning, and candidate assessment.
- [Judge0 IDE](https://ide.judge0.com/): Free, open-source online code editor powered by Judge0. Features advanced syntax highlighting, multiple themes, custom input,compiler flags, command line arguments and real-time execution. Embeddable on any website.
- [Judge0 Mobile IDE](https://apps.apple.com/app/judge0-mobile-ide): Mobile code execution app for iOS and Android. Mobile-optimized interface with smart custom keyboard overlay, syntax highlighting, and full Judge0 execution capabilities.

## Guides
- [Getting Started](https://github.com/judge0/judge0?tab=readme-ov-file#get-started): Quick setup and first API call
- [Installation Guide](https://github.com/judge0/judge0#installation): Self-hosting and deployment options
- [Code Examples](https://github.com/judge0/examples): Sample implementations in various languages
- [API Usage Tutorial](https://github.com/judge0/examples/tree/master/rest-api): Step-by-step API integration

## References
- [Judge0 API Documentation](https://ce.judge0.com/): Endpoints, parameters, and examples for submissions, languages, statuses, system/config info, workers.
- [Supported Languages](https://ce.judge0.com/languages): Complete list of available programming languages
- [Language Configuration](https://extra-ce.judge0.com/languages): Extended language support options

## Resources
- [GitHub](https://github.com/judge0): Source code for all products, issues, and contributions
- [Discord Community](https://discord.gg/GRc3v6n): Community support and discussions
- [Changelog](https://github.com/judge0/judge0/blob/master/CHANGELOG.md): Version history and updates
- [Newsletter](https://subscribe.judge0.com/): Subscribe for updates and announcements

## Contact
- Contact: `contact@judge0.com`
- Website: https://judge0.com/

## Optional
- [Research paper](https://paper.judge0.com/): Architecture and design of Judge0.
- [Postman collection](https://www.postman.com/judge0/public/documentation/k4ahkcl/judge0): API calls and best-practice recommendations in Postman
- [Status page](https://status.judge0.com/): Uptime and incidents for hosted services.