Minify JavaScript to reduce file size or beautify minified code for debugging.
Enter the JavaScript code you want to minify.
Process the code to remove whitespace and shorten variable names.
Click copy to grab the compressed JavaScript output.
JavaScript whitespace can be cosmetic, but it can also separate tokens or affect automatic semicolon insertion. This tool compacts pasted JavaScript by removing unnecessary layout, or expands dense code into an indented form that is easier to inspect. The common surprise is that beautifying is not deobfuscation: it cannot restore original variable names, comments, module boundaries, source-map information, or the author's formatting after those details have been removed.
Minify mode removes formatting where JavaScript token boundaries remain unambiguous. Separators must remain when adjacent tokens would otherwise combine. Line breaks also require care because ECMAScript defines automatic semicolon insertion and restricted productions. Characters inside strings, template literals, and regular-expression literals belong to those literals, so they are not treated as ordinary spacing.
Beautify mode assigns a readable layout to the existing source, separating statements and indenting nested blocks. The result is newly formatted JavaScript, not a reconstruction of the original file. Formatting can expose control flow and expression structure, but it cannot recover deleted comments, previous line numbers, descriptive names that were replaced, or relationships recorded only in a source map.
Not necessarily. Removing spaces and line breaks is minification, while dead-code removal, constant folding, identifier renaming, and deliberate obfuscation are separate transformations. Do not assume those operations occurred unless the displayed result demonstrates them. Minified code should still be tested because a successful conversion is not proof that every runtime behavior is unchanged.
Only if the tool explicitly accepts that syntax. Type annotations and JSX elements are not part of standard ECMAScript source text, even though development tools commonly transform them into JavaScript. If such input is rejected or formatted incorrectly, first transpile it with an appropriate TypeScript or JSX tool, then minify or beautify the resulting JavaScript.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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