JSON Formatter & Validator
JSON Formatter & Validator
Free online JSON formatter, validator, and beautifier
Formula
JSON.parse(input) — throws SyntaxError if invalid
Frequently Asked Questions
What is valid JSON?
JSON requires double-quoted strings, no trailing commas, no comments, and only standard data types (string, number, boolean, null, array, object).
How do I validate JSON?
Paste your JSON into the validator. Common errors: trailing commas after last item, single quotes instead of double, unquoted property names.