TypeScript via tsx on Node.js · no installation required

TypeScript Playground Online

Write and run TypeScript code instantly in your browser. No installation needed. Practice types, interfaces, generics, narrowing, and modern TypeScript patterns with immediate feedback.

Open the TypeScript playground

A small TypeScript starter

Review this deterministic example, then open it in the full sandbox when you are ready to edit and run code.

const language: string = "TypeScript";
console.log("Hello, " + language + "!");

Expected output

Hello, TypeScript!

Common uses

  • Try type narrowing
  • Model data with interfaces
  • Practice generics

Know the limits

The sandbox is intended for small server-side snippets; it is not a browser DOM, package manager, or complete multi-file application workspace.

Continue with TypeScript lessons

Turn a quick experiment into structured practice with these course lessons.