Should I use 2-Space or 4-Space indentation?
2 spaces is standard for modern JavaScript/TypeScript projects and compact viewing, while 4 spaces is popular in Python and enterprise documentation.
Online JSON Formatter & Beautifier
Prettify minified JSON strings with customizable indentation, code folding, and syntax highlighting.
Prettify Raw JSON with Custom Indentation
Paste single-line API payloads or upload `.json` files to instantly format them with 2 spaces, 4 spaces, or tab indentation.
Why Developers Use Client-Side JSON Formatting
Pasting production API responses or customer records into server-based formatters risks data leaks. Our formatter executes 100% locally in your browser memory.
Keyboard Shortcuts & CodeMirror Features
Enjoy full line numbers, bracket matching, collapsible object/array folding, and regex search inside our dual-pane workspace.
Frequently Asked Questions
Is my production API payload safe here?
Yes. Zero network calls are made when formatting or validating your JSON. You can verify this in your browser DevTools Network tab.
Can this handle multi-megabyte JSON files?
Yes, our virtualized CodeMirror 6 editor only renders visible lines in the viewport, keeping scrolling smooth even on 50,000+ line JSON files.