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JavaScript & TypeScript Formatter

Format JavaScript, TypeScript, JSX and TSX properly with Prettier.

To format JavaScript or TypeScript, paste your code and it is parsed into an abstract syntax tree by Prettier and reprinted with consistent style. Because it parses rather than pattern-matches, template literals, JSX and comments survive intact, and a syntax error is reported with its location.

Runs in your browser
Engine
Prettier, running in your browser
Correctness
AST-based — output is always valid syntax
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

Why does the formatter reject my code?

Prettier must parse the code before it can print it, so genuinely invalid syntax fails rather than being silently mangled. The error shows the line where parsing stopped.

Does formatting change what my code does?

No. Prettier only changes whitespace, quote style, semicolons and line breaks. The parsed program is identical — that is the guarantee an AST-based formatter provides over a regex one.

How to use the javascript & typescript formatter

  1. 1Enter or paste your code.
  2. 2Choose the language.
  3. 3Turn "Semicolons" on or off as needed.
  4. 4Turn "Single quotes" on or off as needed.
  5. 5Set the line width.
  6. 6Set the indent size.
  7. 7Turn "Indent with tabs" on or off as needed.
  8. 8The result appears immediately — copy or download it.

Embed this tool

Put the working javascript & typescript formatter on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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