Free TypeScript online compiler

TypeScript scratchpad that feeds Skill Assess

Try typed snippets without setup, tidy payloads with tools, then validate TypeScript knowledge with checkpoints and coding problems.

Open TypeScript runner Coding hub Skill Assess

1 Try Run TypeScript
2 Tool Format & mock
3 Prove Coding / assess

TypeScript scratchpad

Free run — no login. Rate-limited. Same runner as the multi-language hub.

Source

const greeting: string = 'Hello from Toolliyo Playground';
const nums: number[] = [1, 2, 3, 5, 8];
console.log(greeting);
console.log('Sum =', nums.reduce((a, b) => a + b, 0));

stdin (optional)

Output

Press Run to execute.

After you try TypeScript

Frontend track Coding hub Skill Assess

How to use this TypeScript compiler

Start from the typed sample or paste your own TypeScript.
Run to see compile or runtime feedback.
Use JSON tools when working with typed API shapes.
Prove gaps with Skill Assess TypeScript checkpoints.

Tips

Keep types simple here; deep generics belong in tutorials and interviews.
Diff your before/after when refactoring a snippet.
Pair with frontend tutorials when you move into React + TS.

Tools for this stack

Format, mock, or diff — then come back and re-run.

Full toolbench

JSON Formatter Pretty-print API payloads before you paste them into code. Code Diff Compare snippets side by side before you submit. HTML Formatter Clean markup when you are prototyping UI snippets.

TypeScript playground FAQ

Is every TypeScript feature supported?

The runner targets common TS snippets. For large projects use your local toolchain; use Toolliyo for learning and practice loops.

How is this different from the JS playground?

Same Try → Tool → Prove loop, with typed samples and a Skill Assess bridge for TypeScript.

Do I need to install tsc?

No. Run in the browser scratchpad — no local install.

Toolliyo Assistant

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