Online Code Runner
Execute Python, C++, Java, Go, Rust, C#, JavaScript, and 10+ languages in an isolated sandbox with stdin and real-time output.
Terminal is idle
Write code and click “Run Code” to execute in the isolated sandbox.
Multi-Language Online Code Compiler & Execution Engine
Official Roles provides a free, fast, and secure browser-based code runner designed for engineers, students, and competitive programmers. Whether you need an online Java compiler, online JavaScript execution environment, or a sandbox for Python 3, C++, C#, Go, and Rust, execute code instantly without installing local SDKs, toolchains, or runtimes.
Online Java Compiler (OpenJDK 21)
Compile and run Java programs directly on modern OpenJDK. Supports standard classes, Object-Oriented patterns, and custom stdin inputs.
Online JavaScript & TypeScript Execution
Test modern ES6+ JS and typed TypeScript code powered by Node.js. Capture stdout, stderr, object logs, and test asynchronous logic with ease.
Online Python Compiler (Python 3.12)
Write and debug Python scripts with CPython 3.12. Full access to built-in modules including math, collections, and itertools.
Online C++ & C Compiler (GCC 13)
Leverage GCC 13 with C++17/20 STL support. Ideal for practicing data structures, algorithms, pointers, and memory manipulation.
Online C# Compiler (Mono 6.12)
Instant C# execution with .NET System assemblies. Run algorithms and LINQ queries without downloading Visual Studio or heavy SDKs.
Go & Rust Systems Runtimes
Compile Go 1.23 packages and memory-safe Rust 1.82 binaries with instant execution metrics and compiler diagnostics.
Frequently Asked Questions
Can I use this as an online Java compiler without installing Java?
Yes. Select Java from the dropdown, write your code inside the editor, and click “Run Code”. The code compiles and runs on our remote OpenJDK runtime.
How does online JavaScript (JS) execution work?
Your JavaScript code is sent to an isolated Node.js sandbox, where standard output and errors are captured and streamed directly back to the interactive terminal.
Does this online code runner support competitive programming inputs?
Yes. Click “Standard Input (stdin)” to open the input panel and paste test case inputs for LeetCode, HackerRank, or Codeforces problems.
Is this compiler service free to use?
Yes, 100% free with unlimited runs, zero ads, and no sign-up or registration required.