TypeScript · No sign-in needed
Check types. Run the idea. Learn what changed.
Write TypeScript in a browser playground that checks types before running. Try functions and arrays, then read the type feedback alongside your program.
Code runs in your browser. Guided course help requires sign-in.
Use types to state what a function expects
TypeScript makes an input and output contract visible while you write. A type error prevents execution here, so check the message and revise the attempt. Local TypeScript imports are supported; this console workspace does not include npm or browser and Node.js APIs.
A few details to check
When a result surprises you, inspect one small part of the program before rewriting everything.
- A string containing digits is still a string.
- A type annotation describes an expectation; it does not convert a value.
- Check an optional value before treating it as definitely present.
What this runtime supports
Types are checked before running; local .ts imports are supported. Use console.log() and readline(); npm, Node.js and browser APIs are not available.
From an experiment to guided coursework
The public playground runs code without an account. Sign in to work in a personal course or a teacher-led class, where the tutor can use your code and run output when you ask a question. In a teacher-led class, your teacher can read the conversation and review saved code. Personal study is not shared with a teacher.
Questions you might have
Do I need to sign in to run TypeScript?
No. The public coding playground is free to try without signing in. Drafts stay in this browser. Guided course help and saved account work require sign-in.
Can I run any project here?
No. The playground is designed for learning experiments within its browser runtime. Review the supported features above, and keep examples small enough to inspect.
Choose a language. Try a small idea.
Project files, program input and output in your browser.