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Online JS Formatter
Format JS online with just a few clicks
Paste minified, bundled, or messy JavaScript and our free online JS Formatter rewrites it with consistent indentation, spacing, and line breaks in a single click. Beautifying your scripts this way makes them far easier to read, debug, and review before you ship — no installation or sign-up required.
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Improved JavaScript readability
Our JS Formatter enhances the readability of your JavaScript code by adding proper indentation, line breaks, and spacing. This makes your code easier to read, understand, and maintain, especially when working on large projects or collaborating with others.
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Cross-device compatibility
Whether using a desktop, tablet, or smartphone, our JS Formatter is fully responsive and accessible from any device. You can format your JavaScript files on the go, ensuring that your code is always clean and organized, no matter where you are.
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Secure and private processing
Your privacy is our priority. The JS Formatter processes your code directly in your browser, meaning your JavaScript files are not stored on any servers. This ensures that your data remains confidential and secure throughout the formatting process.
How to use the JS formatter
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Paste or Upload Your JavaScript Code: Enter your JavaScript code directly into the formatter's text area or upload your JS file.
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Click 'Format': The tool automatically organizes JavaScript code, adding proper indentation and line breaks.
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Copy or Download the Formatted JS: Once the process is complete, download the formatted JS file or copy the clean and organized code directly.
Supported file types
Open a JavaScript file from your computer, drag one in, or paste your code. The formatter accepts:
.jsJavaScript source files
.mjsES module JavaScript
.cjsCommonJS JavaScript
Everything is processed right in your browser, so your JavaScript never leaves your device. You can also paste code directly instead of opening a file, then copy or download the formatted result.
Cleaning up a different kind of file? Static.app has a matching tool for each format:
Static.app JS Formatter vs other free JavaScript beautifiers
All of these are free, browser-based tools that tidy up messy JavaScript, so here is an honest look at where each one is strongest and where Static.app fits in.
| Static.app | Beautifier.io | Prettier playground | CodeBeautify | FreeFormatter.com | |
|---|---|---|---|---|---|
| PriceEvery tool here formats JavaScript at no cost. | Free | Free (open source) | Free (open source) | Free (ad-supported) | Free |
| Runs in your browserClient-side means your code never leaves your device. FreeFormatter.com does not confirm this. | Yes, fully client-side | Yes, fully client-side | Yes, fully client-side | Yes, client-side | Not stated (server likely) |
| Formatting enginePrettier re-prints code to one strict style; the js-beautify tools preserve more of your original layout. | js-beautify | js-beautify | Prettier (opinionated) | js-beautify | js-beautify |
| Adjustable format optionsThis is a genuine win for the others: we apply good defaults but do not expose indent or brace-style controls. | No (sensible defaults) | Yes (indent, wrap, brace style) | Yes (width, quotes, semicolons) | Some | Yes (indent, brace style) |
| Open or upload a filePrettier playground and Beautifier.io are paste-first; we and CodeBeautify let you open a local file. | Yes (.js open + drag-drop) | Paste or download only | Paste only | Yes (upload + load URL) | Yes (file upload) |
| Copy and download resultPrettier playground copies output; it is not built to download a file. | Copy + download .js | Copy + download | Copy to clipboard | Copy + download | Beautify to new window |
| Live size readoutWe show a live byte count; none of these display before-and-after savings. | Lines, chars, bytes | No | No | Line/column only | No |
| Publish as a hosted websiteThis is our differentiator: format your file, then host it live on your own domain. The pure formatters stop at the clipboard. | Yes (custom domain + free SSL) | No | No | No | No |
| Best forReach for Prettier when you want one enforced style, Beautifier.io or FreeFormatter.com when you want to tune the output, CodeBeautify for a broad toolbox, and Static.app when you also want to host the result. | Format then publish in one place | Fine-tuned beautify settings | Strict, opinionated style | All-in-one dev toolbox | Quick server-side beautify |
If you only need to reshape JavaScript to a specific style, Prettier playground and Beautifier.io give you the most control over the output. Static.app is the better fit when formatting is one step in shipping something: it cleans your JavaScript client-side and then lets you publish the file as a live website on a custom domain with free SSL, which the pure formatter tools do not do.
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Frequently asked questions
What is a JS formatter?
A JS formatter is an online tool that organizes and cleans up JavaScript code by adding proper indentation, line breaks, and spacing. This improves the readability and maintainability of the JS code, making it easier to work with.
Is the JS formatter free to use?
Yes, our JS formatter is completely free to use. You can access it from any device with an internet connection without any hidden costs or limitations.
Do I need to download or install anything to use the JS formatter?
Our JS formatter requires no downloads or installations. It is a fully online, browser-based tool, meaning you can start formatting your JavaScript code immediately without setting up any software.
How do I format JavaScript using the JS formatter?
To format JavaScript, paste your JS code into the formatter's text area or upload a JavaScript file. Click the "Format" button, and the tool will clean up your code by adding proper indentation and spacing. Copy the formatted JS or download the file for immediate use.
What does formatting JavaScript mean?
Formatting JavaScript involves organizing and cleaning up the code by adding proper indentation, line breaks, and spacing. This process makes the JavaScript code easier to read, understand, and maintain, especially in collaborative or large project environments.
Does the JS formatter support modern JavaScript standards?
Yes, our JS formatter supports all versions of JavaScript, including the latest ES6 standards. It ensures that your code is organized according to current web development practices.
Can I use the JS formatter on mobile devices?
Absolutely! Our JS formatter is fully responsive and works seamlessly on desktops, tablets, and smartphones. You can format your JavaScript code on the go without any issues.
What are the benefits of formatting JavaScript?
Formatting JavaScript offers several key benefits: * Improved Readability: Properly formatted JavaScript is easier to read and understand, making it easier to work with. * Easier Maintenance: Clean and organized code is simpler to update and maintain, reducing the likelihood of errors. * Consistent Code Structure: Formatting ensures that your JavaScript code follows a consistent structure, which is especially important in collaborative projects.
What is the best free online JavaScript formatter, and how does Static.app compare?
There is no single best formatter for everyone, because they split into two families. Opinionated tools like the Prettier playground re-print your code to one strict style, while js-beautify tools like Beautifier.io, CodeBeautify, FreeFormatter.com, and our JS Formatter tidy indentation and spacing while keeping more of your original layout. Beautifier.io and FreeFormatter.com let you fine-tune indent size and brace style, which our tool does not. Where Static.app stands apart is what happens after formatting: you can publish the cleaned file as a live website on your own custom domain with free SSL, instead of only copying it to your clipboard.
Does the Static.app JS Formatter send my code to a server?
No. Formatting runs entirely in your browser using the js-beautify engine, so your JavaScript never leaves your device and nothing is uploaded to our servers. Your code is only ever sent anywhere if you separately choose to publish it as a hosted website, which is an explicit, optional step.
Can I change the indentation or brace style when I format JavaScript here?
Not yet. Our JS Formatter applies clean, sensible defaults in one click rather than exposing indent-size or brace-style controls. If you need to tune those settings, tools such as Beautifier.io or FreeFormatter.com offer them. What our tool adds instead is the ability to open a local .js file, download the formatted result, and publish it as a live website on a custom domain with free SSL.