JavaScript Beautifier: Format and Indent JavaScript
The JavaScript Beautifier uses Prettier to turn messy or minified JavaScript into readable, consistently indented code. Paste or enter JavaScript, then configure indentation, print width, semicolons, quote style, and trailing commas before copying the result. It runs in your browser, so there is no local installation or server upload, and it is also listed in Formatters & Beautifiers.
JavaScript Beautifier is a browser-based JavaScript formatter that uses Prettier to turn messy or minified source into readable, consistently indented code. Use it to format JavaScript online when you need a quick cleanup without installing a formatter locally. It is also listed in the Formatters & Beautifiers category.
Paste or enter JavaScript, then adjust the available settings before formatting. You can configure indentation and print width, choose whether semicolons are used, set the quote style, and control trailing commas. These options affect how Prettier lays out the formatted output, so you can tailor the result to your preferred code style.
JavaScript is a programming language, while formatted and minified JavaScript are different presentations of its source code. Minified code is compact and harder to scan; beautifying it adds spacing and indentation to make its structure easier to read. A formatter is useful for inspecting code or preparing it for review, while minification is typically used when a compact representation is preferred.
The JavaScript Beautifier runs entirely in your browser. Your input is processed on your device and is not uploaded, stored, or sent to a server; once the page has loaded, the tool also works offline. It is free to use, so you can format code without installing anything locally.
This tool can help developers and DevOps engineers who need to inspect, clean up, or prepare JavaScript on different machines. It is useful for quick formatting tasks as well as for adjusting output to specific indentation, line-width, punctuation, and quote preferences.
Step 1: Paste or enter your JavaScript in the input area. You can use source code that needs formatting, including minified JavaScript.
Step 2: Adjust the available options to set indentation, print width, semicolons, quotes, and trailing commas.
Step 3: Run the formatter to produce a more readable version of your JavaScript. The output reflects the options you selected.
Step 4: Review and copy the formatted result for use in your project.
Use case: Format JavaScript for a routine code cleanup without installing a formatter locally. Paste your source, choose the available options, and copy the result.
Use case: Beautify code when you are working on a machine where you do not have your usual development setup. The browser-based tool is available wherever you can open the page.
Use case: Format internal JavaScript without uploading it to a third-party server. Processing happens in your browser, and the input is not sent to a server.
Use case: Make minified JavaScript easier to read when inspecting code or tracing how a section is structured. Formatting adds readable layout without requiring you to manually re-indent the source.
Use case: Apply preferred settings for indentation, print width, semicolons, quotes, and trailing commas. This helps when you want the formatted output to follow particular style choices.
Use case: Clean up JavaScript before reviewing or sharing it with another developer. Readable formatting makes the code easier to scan and discuss.