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JSON Validator and Formatter
Paste your JSON to validate it, format it with proper indentation, or minify it to a single line.
All calculations run in your browser — nothing stored or sent. More free tools · Etsy Shop
Frequently Asked Questions
What are common JSON errors?
Missing quotes around property names (JavaScript allows unquoted keys but JSON doesn’t). Trailing comma after the last item in an object or array. Using single quotes instead of double quotes. Unescaped special characters in strings. Comments (JSON doesn’t support comments, unlike JavaScript).
What is the difference between JSON and JavaScript objects?
JSON is a data format based on a subset of JavaScript object syntax. Key differences: JSON property names must be double-quoted strings; JSON doesn’t support functions, undefined, or comments; JSON must have a single root value. JSON.parse() converts JSON text to JavaScript; JSON.stringify() converts JavaScript objects to JSON text.