Free JS Beautifier & Formatter – Make JavaScript Code Readable

Minified or obfuscated JavaScript is practically impossible to read in its raw form, with entire functions crammed onto single lines and variable names stripped down to single letters for production efficiency. Our JS Beautifier & Formatter takes that compressed, unreadable code and instantly restructures it into properly indented, formatted JavaScript that's actually possible to follow and debug. Since this JS Beautifier & Formatter runs entirely inside your browser, proprietary scripts and unpublished code are never uploaded to an external server.

Using the JS Beautifier & Formatter starts with pasting your raw or minified JavaScript into the input panel, where a live byte-size indicator tracks your script's current size. The toolbar gives you two clear modes: Beautify JS transforms your code using a proper JavaScript-aware parsing engine, applying consistent 2-space indentation, sensible line breaks, and preserved structure that respects the logic of your code rather than just inserting random line breaks. Compact Code does the reverse, stripping comments, collapsing whitespace, and removing unnecessary spaces around operators to shrink your script back down for production use.

What makes the beautify mode of this JS Beautifier & Formatter particularly reliable is that it uses an actual JavaScript-aware beautification engine rather than naive regex pattern matching. This means nested functions, conditional blocks, loops, and object literals all get formatted with correct, logical indentation that mirrors how the code actually executes, making it genuinely possible to trace through unfamiliar or obfuscated code and understand what it's doing, whether you're debugging a third-party script, reviewing a colleague's minified build, or just trying to learn from someone else's code.

This tool is especially useful when you encounter a minified script in production and need to investigate a bug, since stepping through condensed, single-line JavaScript in browser dev tools is far harder than working with properly formatted code. Pasting that minified script into this JS Beautifier & Formatter instantly gives you a readable version you can actually reason about, search through, and reference line numbers in without losing your place.

Once your code is processed, whether beautified or compacted, you can copy it directly to your clipboard or download it as a standalone .js file ready for your project. Because everything runs through client-side JavaScript processing in your browser, there's no file size restriction tied to slow uploads, no signup required, and results update as you type. It's a genuinely practical utility for developers debugging minified production code, reviewing unfamiliar scripts, or preparing code for a final production build, completely free.