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.
Run TypeScript online with types enabled
Use this TypeScript playground to test typed variables, interfaces, generics, narrowing, and async examples before bringing the patterns into real projects.
- Run TypeScript snippets without creating a local tsconfig.
- Practice interfaces, generics, utility types, and type narrowing.
- Try examples from the free TypeScript course for JavaScript developers.
Hello World
index.tsconsole.log("Hello, TypeScript!");Practice with guided lessons
Take the same concepts from the playground into focused exercises.
Introduction to TypeScript
Start learning TypeScript from scratch. Understand why TypeScript improves JavaScript with static types for scalable applications.
Interfaces and Types
Master TypeScript interfaces and type aliases. Learn extending, intersection types, declaration merging, and when to use each.
Generics
Write reusable, type-safe code with TypeScript generics. Learn generic functions, interfaces, classes, and constraints.
Type Narrowing
Learn TypeScript type narrowing with typeof, instanceof, in operator, discriminated unions, and user-defined type guards.
Ready for structured learning?
Follow our step-by-step lessons to build a solid foundation.
TypeScript playground FAQ
- Can I run TypeScript in the browser?
- Yes. This playground runs TypeScript in a sandbox and returns the output from your program.
- Is this useful if I already know JavaScript?
- Yes. The examples focus on the TypeScript features JavaScript developers use most: interfaces, generics, narrowing, and safer APIs.
- Do I need a TypeScript project setup?
- No. The playground is for quick practice without installing Node, npm packages, or a local compiler.
Your code runs in a secure, isolated sandbox powered by OmniRun — no containers, just hardware-isolated microVMs.