JSON Formatter & Validator
Format, validate, and beautify your JSON with syntax highlighting and tree view
Formatted JSON will appear here
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Frequently Asked Questions
How do I format JSON?
Simply paste your JSON into the input area on the left. The tool automatically formats it with proper indentation and syntax highlighting. You can also click the 'Format/Beautify' button to ensure perfect 2-space indentation.
What is valid JSON?
Valid JSON must follow strict syntax rules: keys and strings must be in double quotes, no trailing commas, no comments, and values must be valid types (string, number, object, array, boolean, or null). Objects use curly braces {}, arrays use square brackets [].
What's the difference between JSON and JavaScript objects?
JSON is a text format for data exchange, while JavaScript objects are actual runtime data structures. Key differences: JSON requires double quotes around keys, doesn't allow trailing commas, doesn't support undefined or functions, and must be parsed before use in JavaScript.
Why is my JSON invalid?
Common JSON errors include: single quotes instead of double quotes, trailing commas at the end of arrays/objects, unquoted keys, comments (not allowed), undefined values, and unescaped special characters in strings. The validator will highlight the exact error and line number.