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JSON Formatter & Validator

Format, validate, and beautify JSON/JSONC with key sorting, inline arrays, duplicate key detection, and rich error details—all locally.

Size: 0 BLines: 1

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Input JSON

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Quick Examples

Simple Object

{"name": "John", "age": 30, "city": "New York"}...

Nested Structure

{"user":{"profile":{"name":"Jane","settings":{"the...

Array of Objects

[{"id":1,"name":"Item 1","active":true},{"id":2,"n...

With Comments (JSONC)

{ // User information "name": "John", "age":...

How It Works

Privacy First

This json formatter & validator processes your data entirely in your browser. No data is uploaded to any server, ensuring complete privacy and security.

Lightning Fast

Instant processing with real-time validation and error detection. No waiting, no delays - just immediate results.

Versatile Use Cases

Format API responses for better readability
Validate JSON syntax before using in applications
Debug JSON structure and find syntax errors

Mobile Friendly

Responsive design that works perfectly on all devices and screen sizes. Touch-friendly interface for mobile users.

Frequently Asked Questions

What is the difference between JSON formatting and validation?

JSON formatting makes the structure readable with proper indentation, while validation checks if the syntax follows JSON standards. This tool does both simultaneously.

Is my JSON data secure when using this tool?

Yes, all processing happens locally in your browser. No data is sent to any server or stored anywhere.

Can I format large JSON files?

Yes, but very large files (>10MB) might slow down your browser. Consider breaking them into smaller chunks if needed.

What JSON features are supported?

Standard JSON plus JSONC-style input conveniences: comments and trailing commas are safely removed. Optional support for single-quoted strings and coercion of NaN/Infinity.

Can I minify JSON as well as format it?

Yes, set the indent to 0 to create minified (compact) JSON output.