code-runner

Pipe your code via stdin to the run-code.cjs script with the language ID, for example: echo "print('hi')" | node scripts/run-code.cjs python. The script writes the code to a temp file, executes it with the right interpreter or compiler, and returns stdout and stderr.

It supports over 30 languages including JavaScript, TypeScript, Python, Java, C, C++, Go, Rust, Ruby, PHP, Perl, Lua, R, Swift, Kotlin, Scala, Haskell, Elixir, Bash, PowerShell, and more. Each language requires its interpreter or compiler installed and available on PATH.

Yes. The script compiles C with gcc, C++ with g++, and Rust with rustc before running the binary. For Java, it extracts the public class name, compiles with javac, and runs with java using the matching classpath.

This happens when the language interpreter or compiler is not installed or not on the system PATH. Install the required runtime, such as Node.js, Python, Go, or a JDK, and verify it is accessible from your terminal.

Execution is terminated after a default 30-second timeout, and the script reports a timeout error. You can override the limit by passing a custom value with the --timeout flag in milliseconds.

Running arbitrary code carries risk, so review code before execution, especially anything accessing the file system, network, or system commands. For untrusted code, run it inside a sandboxed environment.