Which TypeScript compiler is this?

The same typescript package that ships with the site, running in your browser via transpileModule. It is a snippet compiler, not tsc --build.

Are npm imports supported?

No. Paste self-contained TypeScript. There is no node_modules in the sandbox.

No. Compilation and execution happen in this tab.

That tool only strips types. This playground compiles and then runs the result so you see console output.

TypeScript compiles to JavaScript in your tab, then runs in a sandbox. Nothing is uploaded.

Output appears here after Run.

TypeScript Playground runs entirely in your browser on DevTools — no signup, no upload.

TypeScript Playground is a free in-browser utility, not a hosted API, and keeps no server-side history.

Using TypeScript Playground
Open TypeScript Playground, enter or paste your input, and copy the result.

Track subscriptions, memberships and recurring bills on a private paid/skipped calendar.

Track supplements by meal, empty or with food, and mark taken or skipped on a private calendar.

Write JavaScript, press Run, and read console output in your browser.

Write Dart, press Run, and see print output in your browser.

Run Ruby in your browser with ruby.wasm. First Run downloads the VM, then caches it.

Life Path, Destiny, Soul Urge and Personality numbers from a birth name and date.