Frequently Asked Questions
What does this JavaScript Beautifier do?
It takes unformatted, messy, or minified JavaScript code and reconstructs it with proper indentation and line breaks to make it readable for human developers.
Is my code sent to a server?
No. The formatting engine runs entirely locally in your web browser. We do not transmit or store your code on any server.
Can it format minified JavaScript?
Yes, restoring the structure of minified code is one of its primary features. It will restore loops, conditionals, and blocks, although it cannot restore original variable names.
Does formatting change my code's functionality?
No. The beautifier only modifies whitespace (spaces, tabs, and newlines) outside of strings and regex blocks. The execution logic remains identical.
What is the difference between a formatter and a minifier?
A minifier removes whitespace to reduce file size for production. A formatter adds whitespace back to make it readable during development.
Does it support modern ES6+ syntax?
Yes, it supports modern syntax including arrow functions, async/await, template literals, destructuring, and optional chaining.
Will it mess up my regular expressions?
No, the lexical scanner correctly identifies regular expression literals and preserves their internal contents exactly as written.
How are template literals handled?
Template literals (strings using backticks) are preserved. Any whitespace or line breaks inside them are intentionally left untouched.
Why did my code formatting break?
The most common reason is pasting code with fatal syntax errors (like missing closing brackets) or pasting non-standard JS (like raw JSX or TypeScript).
Can I use this on mobile devices?
Yes, the interface is fully responsive and can be used on tablets and mobile phones to quickly inspect code snippets.
How do I change the indentation?
You can select 2 spaces, 4 spaces, or tabs from the dropdown menu before clicking the beautify button.
Is this tool free?
Yes, our JavaScript beautifier is 100% free for all developers to use without any account registration.
Do you offer an API?
Currently, we only provide the web-based graphical interface for formatting code.
Can it format large files?
Yes, because it runs locally, it can format large JavaScript files, though very large bundles (e.g., 5MB+) may take a few seconds to process depending on your device's CPU.
Does it sort my imports?
No, this tool focuses strictly on whitespace layout and indentation. It does not alter the structural order of your statements.
Will it remove my comments?
No. Both single-line (//) and multi-line (/* */) comments are preserved and properly indented alongside the code.
How is it different from Prettier?
Prettier is a highly opinionated formatter usually integrated directly into your IDE. This tool is a fast, unopinionated, on-demand web utility for quick formatting without project setup.
Can I download the formatted code?
Yes, you can click the 'Download' button to save the output directly as a .js file to your computer.
Why does 2-space indentation seem standard?
Because JavaScript heavily relies on callbacks and nested objects, 2 spaces prevent the code from shifting too far to the right, which makes reading deeply nested logic much easier.
Are there any file size limits?
The only limit is your browser's memory capacity. Most modern browsers can handle formatting files up to several megabytes easily.