Testers

JS & TS runner

Run JavaScript/TypeScript in the browser with stdin/stdout

Read stdin via fs.readFileSync('/dev/stdin') or input() · 5s timeout

Code

Standard input (stdin)

Standard output (stdout)

Output appears here

How to use / Notes

How to use

Type JavaScript or TypeScript into the editor.
Provide stdin if your code reads input.
Run it and inspect the result and stdout.

Notes

Code runs in your browser and is not sent to any server.
Infinite loops or heavy work can freeze the tab.
Node.js-specific APIs and file system access are unavailable.