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Playground

TypeScript playground

This runs the real TypeScript compiler, not a tool that strips the types and hopes. Your code is type-checked first, and a type error stops it before a single line executes, with the compiler's own message. How the sandbox works, and its honest limits, is on the code execution and security page.

TypeScript 5.9.3 (the real compiler, self-hosted)

Ctrl/Cmd+Enter to run

Press Esc then Tab to move keyboard focus out of the code editor.

Ready
Output will appear here after you run your code.

Not sure what to type?

A blank editor is the hard place to start. The TypeScript exercises hand you a program that already runs and ask you to change one thing.

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