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JSON requires double quotes around keys and string values. Comments and trailing commas are invalid. Browser parsing may round integer values beyond JavaScript’s safe integer range, and duplicate keys retain only the last value.
Frequently asked questions
Will it validate JavaScript objects?
Only strict JSON is accepted. JavaScript object notation with unquoted keys, comments or single quotes is not JSON.
Is this tool free?
Yes. There is no account, payment or software download required to use this tool.