Input JSON
Formatted Output
JSON Tree View
Format valid JSON to see the tree view
Free Online JSON Formatter, Validator & Beautifier
Format, validate, and beautify your JSON data instantly with our free JSON formatter tool. Perfect for developers, API testing, debugging, and data analysis. Supports syntax highlighting, tree view, minification, and error detection.
Features
- Format & Beautify - Convert minified JSON to readable, indented format
- Validate JSON - Detect syntax errors with detailed error messages
- Minify - Compress JSON by removing whitespace
- Syntax Highlighting - Color-coded display for easy reading
- Tree View - Explore JSON structure with collapsible nodes
- Statistics - See character count, depth, and key count
- Download - Save formatted JSON as a file
- 100% Client-Side - Your data never leaves your browser
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format that's easy for humans to read and write, and easy for machines to parse and generate. It's widely used in web APIs, configuration files, and data storage.
JSON Syntax Rules
- Data is in name/value pairs:
"name": "value" - Data is separated by commas
- Objects are enclosed in curly braces:
{ } - Arrays are enclosed in square brackets:
[ ] - Strings must use double quotes, not single quotes
- Numbers, booleans (true/false), and null don't need quotes
Common JSON Errors
Trailing comma
JSON doesn't allow commas after the last item in an array or object. Remove the trailing comma.
Single quotes
JSON requires double quotes for strings. Replace 'value' with "value".
Unquoted keys
All object keys must be strings in double quotes. Change {key: "value"} to {"key": "value"}.
Comments
Standard JSON doesn't support comments. Remove any // or /* */ comments.
Frequently Asked Questions
Is my data secure?
Yes! All JSON processing happens entirely in your browser. No data is sent to any server.
What's the maximum JSON size?
Since processing is done locally, it depends on your browser's memory. Most modern browsers can handle several megabytes of JSON without issues.
Can I use this for API debugging?
Absolutely! Paste API responses directly to validate and format them for easier reading and debugging.