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TypeScript Playground

Write, run, and share code snippets — no setup required.

index.ts
Output
Click Run to see the output here.

Run TypeScript online in your browser

This is a free online TypeScript playground and compiler. Write TS directly in your browser, hit Run, and watch tsgo (the native Go-powered TypeScript compiler) emit JavaScript and Node 24 execute it in seconds — no tsc, no ts-node, no tsconfig.json required.

Under the hood, tsgo (the native Go-powered TypeScript compiler) emits .js from your .ts source and Node 24 runs it — so you get full type-checking without paying a transpiler's memory cost on every execution. @types/node is pre-installed for Node API typings. Whether you're testing generics, exploring advanced type-level features, or prepping for a TS interview, this online TypeScript playground goes from idea to output in seconds.

What makes this TypeScript playground useful

  • Instant TypeScript execution — tsgo compiles your .ts files and Node 24 runs them in seconds, with full type-checking.
  • Full TypeScript syntax highlighting, type-aware autocompletion, and tsgo diagnostics — the same editor engine that powers VS Code.
  • Stdin input supported — feed lines to process.stdin from the playground's input box, so typed readline interfaces and async stdin iterators work the same as running ts-node script.ts locally. No install — no tsc, no ts-node, no tsconfig.json.
  • TypeScript 5.3 with tsgo (the native Go-powered TS compiler), ts-node and @types/node — get full type-checking plus ES2022 runtime support.

What you can build in the TypeScript playground

  • Interfaces, generics, union and literal types, and type guards — write typed TS, watch tsgo emit clean .js, and run it on Node 24.
  • Advanced types — mapped types, conditional types, template literal types, and utility types (Pick, Omit, Record) — validated by the compiler.
  • Quick TypeScript experiments — try a new type pattern, confirm a narrowing rule, test a generic constraint, or see how tsgo reports a type error.

Online TypeScript playground FAQ

Is the online TypeScript playground free?
Yes. The TypeScript playground is completely free — no sign-up, no tsc install, no tsconfig.json to scaffold. Open the page and let tsgo compile for you.
Do I need to install tsc or Node to run TypeScript online?
No install needed. You don't need the tsc compiler, ts-node, or a tsconfig.json — tsgo (the native Go-powered TypeScript compiler) emits JS and runs it on Node 24.
Does the TypeScript playground work on mobile and Chromebooks?
Yes. The TypeScript playground works on any modern browser — desktop, tablet, or mobile. Great for testing TS snippets from a Chromebook or iPad without installing Node or tsc.
Does the TypeScript playground support stdin?
Yes. The playground has a stdin input box — lines go to process.stdin after tsgo compiles your .ts and Node 24 executes it. Typed readline interfaces, process.stdin async iterators, and anything typed against @types/node's NodeJS.ReadStream all work the same as running your script locally.
How do I learn TypeScript after trying the playground?
Edit the sample TypeScript, press Run, and iterate. When you want structured practice, Coddy's interactive TypeScript course covers types, generics, interfaces, and advanced type-level programming.