Paste minified or poorly-formatted JavaScript and get back clean, readable code with consistent indentation in one click.
JS Beautifier
JavaScript formatting best practices
Consistent indentation — Whether you prefer 2 spaces, 4 spaces, or tabs, consistent indentation makes nesting depth instantly visible and code reviews faster.
Newlines after semicolons — One statement per line is the single most effective readability improvement in dense, minified code.
Block structure — Opening braces on the same line as the statement, closing braces on their own line is the most widely-used JavaScript style (Airbnb, Google, StandardJS all agree).
Read third-party code — This tool is ideal for understanding minified libraries, debugging compiled bundles, or reviewing code copied from browser dev tools.
Frequently Asked Questions
No. Adding whitespace and newlines has no effect on JavaScript execution — the engine ignores them. The one edge case is Automatic Semicolon Insertion (ASI): if minified code relies on newlines to avoid ASI issues (lines starting with (, [, /), the beautifier preserves those boundaries correctly.
Minification is lossy in terms of readability: variable names get mangled, comments are stripped, and code may be restructured. This tool only adds whitespace and indentation — it cannot recover original variable names or reconstruct deleted comments. For that, you would need a deobfuscator or the original source map. For code that was only whitespace-minified (no renaming), the output is functionally identical to the original.
