JSON Formatter
Free online JSON formatter and validator. Beautify ugly JSON, validate syntax errors, minify JSON, and visualize JSON with interactive tree view.
Formatted output will appear here... How to Use
- 1 Paste or type your JSON into the input area on the left
- 2 Choose an action: click Format to beautify, Minify to compress, or Validate to check syntax
- 3 Switch between Raw and Tree tabs in the output area to view results in different formats
- 4 Click Copy to copy the result to your clipboard
Use Cases
Paste minified API responses to make them human-readable instantly.
Check JSON configuration files for syntax errors before deploying.
Compress JSON data to reduce file size before embedding in your app.
Use Tree View to navigate deeply nested JSON objects and arrays.
FAQ
Yes. All processing happens entirely in your browser. Your data is never sent to any server.
Format beautifies your JSON (assuming it's valid), while Validate checks whether the JSON syntax is correct and shows you exactly where errors are.
Yes, but performance may decrease for files larger than 1MB. There is no hard size limit.
Common causes include trailing commas, single quotes instead of double quotes, unquoted keys, or missing brackets. The error message will indicate the line and position of the issue.
No. This tool strictly follows the JSON specification (RFC 8259). Comments and trailing commas are not supported.
Once the page is loaded, the tool works entirely in your browser with no internet connection required.
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