Online Compiler

Run code online in your browser with VulnTech's compiler for Python, JavaScript, C, C++, Java, SQL, Shell and PHP. Browser-side execution.

Run Code Online in Your Browser

VulnTech's compiler is built for students who want a clean place to write small programs, run them quickly, and read terminal output without installing local tools.

Supported Languages

Choose a language to open its browser-side compiler page:

Python JavaScript C C++ Java SQL Shell/Bash PHP

Browser-Side Execution

Code execution stays browser-side through Web Workers and WebAssembly runtimes where needed. Runtimes are lazy-loaded only when the selected language needs them, and the server-side execution endpoint remains disabled.

Features

clean editor and terminal layout
browser-side workers for execution
syntax and runtime errors in terminal output
stdin support where the runtime allows it
Stop button and execution timeouts
repeated runs without server-side execution

Practice Ideas

Choose a language tab and run the starter program before editing it.
Try one stdin exercise and one syntax-error exercise for each language you are learning.
Use the Stop button and timeout selector when testing loops or larger examples.

Example Exercises

Python input() example JavaScript array example C scanf input example C++ cin/cout example Java Scanner example SQL JOIN example Shell grep example PHP array example

Limitations

large WebAssembly runtimes can take longer on the first run
browser memory limits apply to heavy programs
networking, server access, and OS-level operations are restricted
some runtimes are experimental and best suited for learning examples

FAQ

Does VulnTech run my code on a server?

No. The compiler is designed for browser-side execution, and the disabled /compiler/execute/ endpoint is kept only for compatibility.

Which languages are available?

Python, JavaScript, C, C++, Java, SQL, Shell/Bash, and PHP are available from the compiler page.

Can I provide input to programs?

Basic stdin is available for runtimes that support it, including Python input(), C scanf, C++ cin, Java Scanner, and limited PHP input patterns.

Why can the first run be slower?

Large WebAssembly runtimes are lazy-loaded only when a language is selected or run, so the first run can take longer than repeated runs.

Project Files

main.py