JSON Formatter
Validate, format, and beautify your JSON data instantly. All processing happens 100% locally in your browser for maximum privacy.
account_tree Structure
How it works
Paste your raw, minified, or messy JSON into the editor. Validity is checked live as you type, with the exact line and column of any error.
Click Format to expand the data with consistent indentation (2 spaces), or Minify to compact it.
Use the Structure tree to explore large datasets without getting lost in brackets and commas.
Security & Privacy
At ToolXero, we believe developer tools shouldn't harvest your sensitive data. Unlike many online formatters, your JSON never leaves your machine.
- check_circleNo data sent to our servers
- check_circleWorks offline once page is loaded
- check_circleSecure browser environment
Frequently Asked Questions
What is JSON Formatting?expand_more
JSON formatting is the process of making machine-readable data (minified JSON) human-readable by adding indentation, line breaks, and consistent spacing. It makes debugging and code reviews significantly easier.
Can I format invalid JSON?expand_more
No — invalid JSON can't be reformatted. The tool validates as you type and reports the exact line and column where the syntax breaks, so you can fix it before formatting the full structure.
How large can the files be?expand_more
Since processing is local, the limit is mostly determined by your browser's memory. We've optimized the tree view and formatter to handle several megabytes of data smoothly.