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JavaScript Formatter

Format JavaScript / TypeScript code.

beats beautifier.io edge: TS + JSX-light support inline
input.js
paste JS
indent
Guide

About JavaScript Formatter

Format JavaScript and TypeScript with consistent indentation, bracket-newline rules, and JSX-light support. Handles arrow functions, template literals, async/await, optional chaining, nullish coalescing. Output is byte-different but semantically identical — the formatter parses to AST first, refuses to emit anything if the input does not parse.

When this beats Prettier

Prettier dominates project formatting — every modern repo runs it on save. The tool here is for everything else:

  • A snippet from Stack Overflow that you want to read before pasting
  • Minified production output you need to debug without a sourcemap
  • Code from a meeting Slack to make sense of a teammate’s quick paste
  • Quick check before pasting into a code review

For a real codebase, install Prettier with the team’s config. For one-off readability, this tool is a tab away.

Common workflows

Read minified code. Drop in the bundle output. Re-formats with proper indents and breaks. Combine with a JS sourcemap to see original variable names.

Format a Slack-pasted snippet. Coworker pastes a hard-to-read line; format reveals the structure.

Pre-PR sanity check. Quick visual confirm the snippet you about to paste into a review is readable.

Reformat after Tailwind class extraction. Tailwind’s class strings get long; format rewraps for readability.

Why local

JavaScript that is interesting enough to format usually contains business logic. Pasting into a remote tool exposes it. Local formatting via a JS parser keeps the code on your machine.

Frequently asked questions

Is this Prettier?
Same idea, lighter. Prettier is the industry standard for project-wide formatting; this tool is for ad-hoc snippets where running Prettier locally is overkill.
Does it support TypeScript?
Yes — modern TS syntax (generics, type assertions, decorators, satisfies, const type parameters). JSX/TSX too, with conservative reformatting.
Tab or spaces?
Pick your indent — 2 spaces (default), 4 spaces, or tab. Affects only whitespace; semantics untouched.
Will it break my code?
No — the parser is strict. If your code parses, the output is semantically identical. If it does not parse, you see an error before any change.
What about minified code?
Yes — paste minified output, get back readable source. Useful when debugging a production bundle. For best results, pair with a sourcemap.
Does it handle ESM imports?
Yes. Imports get sorted into groups (npm, then relative) with the optional Sort imports toggle.

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Last updated: 2025-01-15