TSOnline TypeScript Compiler
main.tsPress Run or Ctrl + Enter.
Run TypeScript online without setting up a project — interfaces, generics and enums work, and output appears instantly. Free, and it runs on your device.
How it works
Step 1
Write or paste
Type TypeScript code or paste it in. It is kept on this device for next time.
Step 2
Run
Press Run or Ctrl + Enter. Answers for input go in the Input box.
Step 3
See the output
Output, errors with their line number, and how long it took.
Tips for TypeScript
- Types are removed and the code runs straight away — like tsx or ts-node with transpile-only.
- Type errors are not reported; syntax errors are, with the line number.
- Interfaces, enums, generics and classes with access modifiers all work.
Questions
How do I run TypeScript online?
Write or paste TypeScript and press Run. The types are removed and the JavaScript runs at once — output appears on the right.
Are type errors shown?
No — like tsx or ts-node in transpile-only mode, the code runs without a type check. Syntax errors are shown with their line number.
Which TypeScript features work?
Interfaces, type aliases, generics, enums, classes with public / private / readonly, optional chaining and async / await.
Is my code uploaded?
No. It runs in your browser and is saved only on this device.