This tool uses the JS Beautify library to format JavaScript with consistent indentation. Use it on minified code to make it readable, or on your own code before a code review. The minify option is a basic whitespace stripper — for production builds use a bundler like Webpack or esbuild.
Whether you are minifying for production or prettifying for debugging, having an instant code tool in your browser speeds up every development workflow. The JS Prettifier is Prettify or minify JavaScript code — and it runs entirely in your browser with no data sent to any server. Whether you are a developer, data analyst, student, or technical user, this free tool removes friction from your workflow and gives you instant, accurate results every time. If you need to take the output a step further, try the HTML Prettifier — it handles the next stage of the workflow.
The JS Prettifier is a free, browser-based utility that prettify or minify javascript code. It processes your input locally using JavaScript, which means all operations happen on your device — no uploads, no server processing, and no privacy concerns. The result is immediate, updating as you interact with the tool. Alternatively, if you are looking for something slightly different, the CSS Prettifier may be a better fit.
Tools like this are used every day by web developers, DevOps engineers, data scientists, security professionals, and content creators. The JS Prettifier belongs to this class of essential utilities that save time, reduce errors, and streamline everyday technical tasks.
There are many generic tool sites online, but the JS Prettifier on Chunky Munster is built with a developer-first mindset. Everything runs in your browser — there are no paywalls, no rate limits, no forced sign-ups, and no advertisements disrupting your concentration. For related work, the JavaScript Minifier is another popular tool worth bookmarking.
The JS Prettifier formats, validates, or minifies code — improving readability during development or reducing file size for production deployment.
No. All processing is done locally in your browser using JavaScript. Your code never leaves your device.
Prettifying adds whitespace and indentation to make code human-readable. Minifying removes whitespace to reduce file size for faster loading in production.
Yes — free to use with no account, no limits, and no data sent anywhere.
The JS Prettifier is a free, private, and reliable tool for every developer and technical user. Bookmark this page for fast access, share it with your team, and explore the full collection of tools at Chunky Munster — all free, all browser-based, all yours. You might also find these related tools useful: HTML Prettifier, CSS Prettifier, JavaScript Minifier.