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How to use JSON Validator

Paste your JSON, and the tool checks its syntax and reports the exact line and reason for any error it finds.

Frequently asked questions

What makes JSON invalid?

Trailing commas, single quotes instead of double quotes, unquoted keys, and comments all make JSON invalid.

Does it check JSON Schema?

No — this tool checks JSON syntax only. Use the JSON Schema Validator for structure validation.

Why is my JSON failing?

Common causes: trailing commas after the last item, missing quotes around keys, or using undefined/NaN.

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