JavaScript / CSS Formatter
Format JavaScript and CSS source code
Features
Format both JS and CSS
Format JavaScript and CSS separately by switching tabs
Choose from 4 indent widths
Supports 2 spaces, 4 spaces, tabs, and minify
Choose the brace style
Specify whether the opening brace is on the same line or a new line in JS
Stable with Prettier
Stable output results from the standard formatting library
How to Use
Select the language tab
Switch between the JavaScript and CSS tabs to specify the target
Paste the code
Enter the source code you want to format in the input field
Set the style
Choose the indent width and brace style to your liking
Run the formatting
Press the format button to display the result, ready to copy or save
Use Cases
Format before code review
Tidy messy code into a uniform style to streamline review
Make minified code readable
Expand minified code to decipher its content
Minify deliverable code
Reduce file size for distribution with the minify option
Clean up sample code for study
Tidy copied code for readability to aid understanding
Fundamentals
What is Code Formatting?
Code formatting is the process of adjusting the appearance of code—such as indentation, line breaks, and bracket positioning—according to consistent rules without changing its functionality. When writing style variations disappear, diffs become easier to read in multi-person development, reducing review burden.
What is Prettier?
Prettier is a formatter widely used globally for formatting JavaScript and CSS. It was designed with the philosophy of delegating detailed formatting decisions to a tool to achieve consistency.
Safety and Privacy
Runs entirely in your browser
Your input data is processed only within your browser and is never sent externally.
Processing only in your browser
code formatting is processed entirely within your browser, and input data is not sent to any server.
Communications encrypted with HTTPS
Page loading is also encrypted by TLS, and content cannot be read by third parties.
No transmission to third parties
Input content is not sent to external services such as ad networks or trackers.
No automatic saving of results
the formatted result and input suggestions are not stored on the server.
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Updates
- update #216
Fixed issue where Japanese text was displayed on non-Japanese pages for some tools