JavaScript Formatter
Format JavaScript with Prettier — consistent indentation, semicolons and quotes. Syntax errors are reported instead of producing broken output.
This tool runs entirely in your browser.
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How to use the JavaScript Formatter
- 1Paste JavaScript.
- 2Choose indentation and quote style.
- 3Click “Format JavaScript” and copy the result.
What is the JavaScript Formatter?
Prettier parses your code into a syntax tree and prints it again from scratch, so the formatting is consistent regardless of the input style. Modern syntax and JSX are supported.
Frequently asked questions
Does it support TypeScript?
Plain JavaScript and JSX are supported. TypeScript-only syntax such as type annotations will be reported as a syntax error.
Is the JavaScript Formatter free and private?
Yes. The JavaScript Formatter is free, needs no account, and runs entirely in your browser. What you type is never sent to a server or stored.