JSON Validator
Check if your JSON is valid. Get plain-English error messages with exact line and column numbers, plus full structure stats.
Input JSON
0 chars
Validation Result
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Paste JSON on the left and click Validate
— or press Ctrl+Enter to run instantly.
— or press Ctrl+Enter to run instantly.
What makes JSON invalid?
Common JSON errors include: trailing commas after the last element, single quotes instead of double quotes around keys or strings, missing quotes on keys, unescaped special characters in strings, mismatched brackets or braces, and values like undefined or NaN which are not valid JSON types.
This validator gives you the exact line and column number of the error plus a plain-English explanation — so you can fix it in seconds.