JavaScript Formatter & Beautifier
Paste minified, compressed, or poorly indented JavaScript and this tool re-inden
Paste minified, compressed, or poorly indented JavaScript and this tool re-inden
How to use JavaScript Formatter & Beautifier
- Paste your minified or messy JavaScript into the input box.
- Choose your indent size - 2 spaces, 4 spaces, or tabs.
- Copy or download the beautified code, or click Minify instead to compact it.
About JavaScript Formatter & Beautifier
Paste minified, compressed, or poorly indented JavaScript and this tool re-indents it with consistent line breaks so it becomes readable again. It adds newlines after statements and inside blocks, indents by the depth of your braces and brackets (2 spaces, 4 spaces, or tabs), and puts each object property and each block on its own line. Strings, template literals, regular expressions, and both line and block comments are detected and copied through exactly as written, so your code is never altered inside quotes.
It works by scanning the code character by character and tracking bracket depth, rather than fully parsing it, which keeps everything fast and completely offline. Because of that, it re-flows structure and indentation but does not rewrite the spacing inside expressions - it will not, for example, insert spaces around your =, +, or => operators, and it leaves ternary (a ? b : c) spacing as you wrote it. The included "Minify" option strips comments and collapses whitespace into a single line; that assumes your code ends statements with semicolons, so avoid it on code that relies on automatic semicolon insertion.
Everything runs locally in your browser using plain JavaScript - there is no upload, no server, and no sign-up. Your code stays on your device, which makes the tool safe to use on private or proprietary snippets. You can copy the result or download it as a .js file.
Frequently asked questions
- How does the formatter decide where to indent?
- It tracks the nesting depth of your { } braces and [ ] ( ) brackets as it reads the code, then adds a line break and one indent level after each opening brace and before each closing brace. Statements ending in a semicolon start a new line, and each object property goes on its own line.
- Will it change the code inside my strings or regular expressions?
- No. The tool recognizes single- and double-quoted strings, template literals (including nested ${...} expressions), regex literals, and comments, and passes their contents through byte-for-byte. Only whitespace and line breaks outside those regions are changed.
- Does it add spaces around operators like = and =>?
- No. This tool normalizes indentation and line breaks but does not reformat the spacing inside expressions, so your operator and ternary spacing is left as you wrote it. It focuses on making minified or one-line code readable through structure, not on full style enforcement.
- What does the Minify button do, and is it safe?
- Minify removes comments and collapses the code onto a single line, stripping whitespace around punctuation. It assumes every statement is terminated with a semicolon. If your code relies on automatic semicolon insertion (for example a bare return followed by a new line), review the output before using it.
- Is my code uploaded anywhere?
- No. All formatting happens in your browser with plain JavaScript. Nothing is sent to a server, there are no accounts, and your code never leaves your device - so it is safe for private or work code.
- Can it fix broken or invalid JavaScript?
- It only reformats; it does not validate or repair syntax. If brackets or quotes are unmatched, the output may look off because the tool cannot infer the intended structure. Use a linter or your editor to catch actual syntax errors.