JSON Formatter
Format and validate JSON data
Calculator
JSON Tips
- • Keys must be in double quotes:
"key" - • Strings must use double quotes, not single
- • No trailing commas allowed
- • Valid values: strings, numbers, booleans, null, objects, arrays
How to Use
Format and validate JSON
Paste JSON
Input your JSON data
Format/Minify
Click to beautify or compress
Validate
Check for syntax errors
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Frequently Asked Questions
JSON (JavaScript Object Notation) is a lightweight data format for storing and exchanging data. Used in APIs, configuration files, and web applications. It uses key-value pairs and arrays, similar to JavaScript objects.
JSON must follow strict syntax: keys in double quotes, no trailing commas, no comments, no single quotes. Common errors: missing quotes, extra commas, unescaped special characters. Our formatter highlights syntax errors with line numbers.
Minified JSON removes all whitespace for smaller file size (better for production). Formatted/beautified JSON adds indentation and line breaks for readability (better for development). Both are valid JSON.
No, JSON only supports: strings, numbers, booleans, null, arrays, and objects. Dates are stored as ISO strings. Functions cannot be stored. For these needs, use JavaScript objects or add custom parsing logic.