Pure front-end local processing · Data never uploaded · JavaScript beautification and minification
Zero dependencies · Works offlineJavaScript is the core language of modern web development, but as projects grow, code often becomes difficult to read—especially after being processed by build tools that shorten variable names and remove whitespace, turning it into an unreadable blob. Our Online JS Formatter & Minifier runs entirely in your browser, requiring no software installation, and can quickly restore minified code to a readable format or compress formatted code to its smallest size.
Unlike most online tools, we never upload your code to any server. All processing is done on your device, and it works even without an internet connection. This is especially important when handling code containing sensitive logic (such as business algorithms or API key handling).
Formatting Code: Paste your minified JavaScript code into the input box, select "Format" mode, adjust indentation and quote options, then click "Process." The tool will automatically expand the code into a multi-line format with proper indentation. If your code contains comments, you can check the "Keep Comments" option.
Minifying Code: Paste your formatted JavaScript code into the input box, select "Minify" mode, then click "Process." The tool will remove all whitespace and comments, producing compact single-line code. The minified code can be directly embedded in HTML or used as a standalone JS file.
Notes: Since this tool is based on regular expression processing, the formatting result may not be perfect for code containing complex template strings, nested regular expressions, or unconventional syntax. We recommend testing in a staging environment before production use.
Absolutely not. This tool is built with pure front-end technology. All JavaScript formatting and minification happen in your browser. You can press F12 to open Developer Tools and check the Network panel to confirm there are no data upload requests. The tool works normally even without an internet connection.
There is no hard limit in theory, but due to browser memory and performance constraints, we recommend processing JavaScript files no larger than 1MB. For very large files, consider processing in segments.
This tool is based on regular expression processing and can correctly format and minify most common code. However, for edge cases such as complex template string nesting or special syntax in regular expressions, the result may not be perfect. We recommend testing in a staging environment before production use.
Minify mode removes all single-line comments (//) and multi-line comments (/* */) by default to minimize code size. In format mode, you can choose whether to keep or remove comments.
The formatter supports three indentation modes: 2 spaces, 4 spaces, and Tab characters. You can switch freely in the options panel, and the formatted result will update in real time.