JSON Formatter & Validator
Paste your JSON below to format, validate, or minify it. Everything runs locally — your data never leaves your browser.
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Alphabetical
Formatted JSON will appear here...
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How to Use the JSON Formatter
This free online JSON formatter lets you quickly beautify, validate, and minify JSON data. Simply paste your JSON into the input field and click "Format" to pretty-print it with proper indentation.
Features
- Format & Beautify — Pretty-print JSON with configurable indentation (2 spaces, 4 spaces, or tabs).
- Validate — Instantly check if your JSON is valid with clear error messages showing the exact position of issues.
- Minify — Remove whitespace and compress JSON for production use.
- Sort Keys — Alphabetically sort all object keys for consistent formatting.
- 100% Private — All processing happens in your browser. No data is ever sent to a server.
What is JSON?
JSON (JavaScript Object Notation) is a lightweight data interchange format. It's the most common format for APIs, configuration files, and data storage. Valid JSON must use double quotes for keys and strings, and supports objects, arrays, strings, numbers, booleans, and null values.
Common JSON Errors
- Trailing commas after the last property in an object or array
- Single quotes instead of double quotes
- Missing quotes around keys
- Comments (JSON does not support comments)
- Undefined or NaN values