Format and minify JavaScript online 12 uses
Pretty-print or minify JavaScript instantly in your browser, correctly handling strings, template literals, regex, and comments.
/ 5 - Be the first to rate this tool Thanks for rating!
Verification failed - please try again.
Quick check
Please verify you're not a robot to submit your rating.
Give feedback
Tell us what you think about Format and minify JavaScript online.
- Runs entirely in your browser — your code is never sent to a server
- Correctly handles strings, template literals, regex, and comments
- Free, no account required
How it works
-
1
Paste the code or data you want to format.
-
2
Choose pretty-print or minify, and set the indent width if you like.
-
3
The formatted result updates instantly.
-
4
Copy the result, or download it as a file.
Why use this tool
Every dev utility, one place
Format, convert, encode, decode, and generate — no more juggling ten tabs.
100% private, always
Every tool runs in your browser — your code and data are never sent anywhere.
Works on any device
Runs on Windows, Mac, Linux, iOS, and Android — nothing to install.
Instant results
No queues, no build step — results update as you type.
Built to handle real data
Full Unicode support and RFC-compliant parsing, edge cases included.
Free, always
Free to use, with no rate limits, sign-up, or trial period.
Frequently asked questions
It is a heuristic beautifier meant for quick readability; it is not a full AST replacement like Prettier.
It maintains the author's style; it will not inject missing semicolons where automatic insertion applies.
Arrow functions, template literals, and destructuring are fully recognized and spaced appropriately.
No, this only removes whitespace and comments. It does not shorten or mangle internal variables.
It works best on standard JavaScript; complex React JSX syntax might produce inconsistent indentation.
From the blog
Mastering Base64: What It Is, How It Works, and When Not to Use It
Base64 is everywhere in modern web development, from data URIs to authentication headers. Here is a deep dive into how it works and common pitfalls to avoid.
Demystifying JSON: How to Troubleshoot Common Parsing Errors
JSON is the backbone of web APIs, but syntax mistakes can halt your code. Here is how to identify and fix missing commas, unescaped strings, and trailing characters.
Stop Pasting Secrets Into Random Websites: A Developer's Security Checklist
Every day developers paste API keys, JWTs, and credentials into online tools without a second thought. Here's why that habit is riskier than it seems, and a practical checklist to break it.
Popular tools
Convert PDF to Excel for free
Pull tables and data out of a PDF into an editable spreadsheet.
Resize an image online for free
Resize JPG, PNG, or WebP images to exact dimensions or a percentage, right in your browser.
Compress a PDF file for free
Shrink PDF file size while keeping quality readable, right in your browser.
Convert PDF to Word for free
Turn a PDF into an editable Word document in seconds.
Convert JPG or PNG images to PDF for free
Combine one or more images into a single PDF document, right in your browser.
Merge PDF files online for free
Combine multiple PDF files into a single document in your browser. No install, no signup.
Generate a QR code for free
Create a static QR code for a URL, text, Wi-Fi, or contact card in seconds.
Generate a vCard QR code for free
Share your contact details instantly with a scannable vCard QR code.
Convert an image format for free
Convert between JPG, PNG, and WebP, right in your browser.
URL encode or decode a string online
Percent-encode or decode a URL or query string component instantly in your browser.
Format and validate JSON online
Paste JSON to pretty-print, minify, and validate it instantly in your browser.
Split a PDF into separate files for free
Extract pages or split a PDF into multiple files instantly in your browser.