About the TypeScript Formatter
What is a TypeScript formatter?
A TypeScript formatter cleans up dense or minified TS the same way a JS beautifier does — consistent indentation, one statement per line, readable spacing — while coping with the syntax TypeScript adds on top: interfaces, type aliases, generics, enums, access modifiers, and decorators. This tool formats live as you type, with TypeScript syntax highlighting on both editors.
It runs on the js-beautify engine, bundled locally with the page — no CDN fetch, no upload, works offline. Being tokenizer-based rather than a strict parser, it never rejects your input: half-finished refactors and pasted fragments get formatted on a best-effort basis instead of throwing errors. One honest caveat: spacing around generics can come out looser than Prettier's style (for example get < T > (x) instead of get<T>(x)) — the output is always valid TypeScript, just not always identical to what an AST-based formatter would print.
How to Use This Tool
- Add your code. Paste TypeScript into the left editor, open a
.tsfile, or click Sample. - Watch it format. The beautified output appears live on the right.
- Tune the style. Choose your indentation, brace placement, and whether blank lines survive.
- Take the result. Copy it or download it as a
.tsfile.
Common Use Cases
- Reading compiled or bundled TS: Expand compressed code into a reviewable form.
- Normalizing pasted code: Bring snippets from PRs, docs, and chat into a consistent style.
- Cleaning up type declarations: Make dense interface and type-alias blocks readable again.
- Style conversion: Switch a file between 2-space, 4-space, and tab indentation, or between brace styles.
- Sharing examples: Format consistently for documentation and teaching material.
Working with plain JS? Use the JavaScript Formatter, format React/JSX, or convert types with JSON to TypeScript.
Frequently Asked Questions
Does it support interfaces, generics, and enums?
Yes. Interfaces, type aliases, unions, generics, enums, access modifiers, and decorators all pass through correctly and get standard indentation. Spacing around generic angle brackets may be looser than Prettier prints, but the output is always valid TypeScript.
Will formatting change my types or behavior?
No. Only whitespace and line breaks change; every token in your code is preserved in order, so both the runtime behavior and the type checking stay identical.
Can it format .tsx files?
For TSX use the React Formatter, which enables JSX handling so your markup is preserved untouched. This page is tuned for plain .ts files.
Why does the output differ slightly from Prettier?
Prettier parses your code into a full syntax tree and reprints it from scratch; this tool uses a fast tokenizer-based beautifier that runs entirely offline with no dependencies. The result is valid, consistently indented TypeScript with occasional cosmetic differences, mostly around generics.
Does it handle broken or partial code?
Yes — that is a strength of the tokenizer approach. Code that would not compile still gets best-effort formatting instead of an error, which is handy mid-refactor.
Is my code uploaded anywhere?
No. The formatter is bundled with the page and runs locally in your browser — no CDN requests, no uploads, no logging — and keeps working offline.