JSON Formatter & Validator
Format, validate, beautify and minify JSON data instantly. Free online tool with tree view and error detection.
Input JSON
Output
Formatted JSON will appear here...
FAQ
Is my JSON data sent to a server?
No. All formatting and validation happens entirely in your browser. Your data never leaves your device.
What's the maximum JSON size I can format?
There's no hard limit set by the tool, but very large files (tens of MB) may slow down your browser.
Does this tool support JSON with comments?
No, this tool follows standard JSON specification which does not allow comments. Remove comments before formatting.
How does the tree view work?
The tree view renders your JSON as a collapsible hierarchy. Click the toggle buttons to expand or collapse nodes.