STEP 01
Paste or Upload JS
Insert JavaScript into the editor, or upload a .js, .mjs, or .cjs file up to 5 MB.
Free Developer Tool
JavaScript Beautifier
Make messy or minified JavaScript easier to read. Paste or upload your code, choose formatting options, and get clean, indented JS ready to copy or download.
Format JavaScript Online
Browser-based code formatting
Original JavaScript
Beautified JavaScript
This tool formats code but does not run it or guarantee that invalid JavaScript becomes valid. Code is processed in your browser. For best results, the formatter library must load; a limited basic fallback is available if it doesn't.
1Original lines
0Formatted lines
0 BInput size
0 BOutput size
How to Beautify JavaScript Online
Three steps to make compressed or inconsistently formatted JavaScript easier to inspect and maintain.
STEP 02
Choose Formatting
Choose spaces or tabs, brace placement, line wrapping, and line-break preferences.
STEP 03
Copy or Download
Review readable code, copy it to your clipboard, or download the output as a .js file.
Why Use This JavaScript Beautifier?
A clean code layout can make debugging, code reviews, and maintenance easier.
Read Minified Code
Expand compressed JavaScript into lines and indentation so nested logic is easier to follow.
Browser-Based
Pasted code is formatted client-side and is not sent to this site's server by the tool.
Custom Output
Set indentation, brace style, and wrapping to match a preferred reading layout.
What Is a JavaScript Beautifier?
A JavaScript beautifier, also called a JS formatter or pretty printer, changes the whitespace, indentation, and line breaks in JavaScript code to make it easier to read. It helps developers inspect minified scripts, prepare code examples, and review unfamiliar source files.
This tool formats existing source. It is not a compiler, code executor, security scanner, or guaranteed bug fixer. Minification may already have removed variable names or comments that a formatter cannot restore. Always test formatted output in your own project before replacing production code.
JavaScript Beautifier FAQs
Common questions about formatting, minified JS, privacy and downloads.
Can I beautify minified JavaScript?
Yes. The formatter adds indentation and line breaks to many minified or compressed JavaScript files, making their structure easier to inspect.
Does beautifying code restore original variable names?
No. Formatting cannot recover names, comments, or source structure already removed during minification.
Will this tool execute my JavaScript?
No. The formatter treats pasted JavaScript as text; it does not run the submitted script.
Can I choose tabs or spaces?
Yes. You can select 2, 4, or 8 spaces or tab indentation, along with brace style and wrapping options.
Is the code uploaded to the server?
No. Formatting occurs in your browser. The tool may download its formatting library from a public CDN, but your pasted source is not sent there by the tool.
Can I download formatted JavaScript?
Yes. After formatting, click Download .js to save the beautified result as a JavaScript source file.