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Format and beautify JavaScript code with syntax highlighting, validation, and minification options.
A JavaScript beautifier takes minified, compressed, or inconsistently formatted code and re-indents it into clean, readable source. Paste a one-line bundle or a messy snippet and the tool spaces and indents it so you can actually follow the logic — useful for inspecting third-party scripts, tidying code before review, or understanding how a minified library is structured.
This beautifier is powered by the js-beautify engine and runs entirely in your browser. The code you paste is never uploaded, logged, or stored — all formatting happens locally on your device, so you can safely reformat proprietary or sensitive scripts without them leaving the tab. You can choose the indent size (2 spaces, 4 spaces, or tabs), pick a brace style, and optionally collapse blank lines for a more compact result.
Keep in mind that a beautifier is a formatter, not a linter or a compiler. It re-indents and spaces your code without changing what it does, and it does not fix bugs, rename variables, or restore names that a minifier shortened. The output is functionally identical to the input — just easier to read.
No. The js-beautify engine runs locally in your browser, so the code you paste never leaves your device.
No. A beautifier only re-indents and spaces the code. The output is functionally identical to the input; it does not alter logic or fix errors.
No. Once a minifier shortens names like customerName to c, that information is lost. A beautifier can restore indentation and spacing but cannot recover the original names.
Brace style controls where opening braces sit. Collapse keeps them on the same line, expand moves them to a new line, and end-expand is a hybrid. Choose whichever matches your project's convention.
No. It formats code but does not analyze it for bugs or style issues. Use a dedicated linter such as ESLint or Biome for that.