JavaScript Formatter
Turn compacted or inconsistently indented JavaScript into readable code. Formatting runs in your browser with js-beautify — your source never leaves the device.
Result
Paste code, then Format. Processing stays in your browser.
How to format JavaScript
- Paste JavaScript (not TypeScript or JSX).
- Choose indent: 2 spaces, 4 spaces, or tab.
- Click Format, or press Ctrl+Enter (Cmd+Enter on Mac).
- Copy or download the pretty-printed source.
FAQ
- No. js-beautify runs entirely in your browser. Your code is not sent to DevTilt.
- Yes. Use 2 spaces (default), 4 spaces, or tabs. Format is button-driven so large files are not reformatted on every keystroke.
- No. Input is treated as JavaScript. TypeScript-only syntax is unsupported. JSX may indent incorrectly — use a dedicated JSX tool or your editor for that.
- Inputs over 500KB show a warning. Inputs over 2MB are rejected so the tab stays responsive.
- Syntax errors, template literals with nested HTML, or non-JavaScript constructs can confuse the beautifier. Fix parser errors first, or format smaller snippets to isolate the problem line.
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