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Tool processing happens entirely in your browser. Your input is never sent to our servers.
JSON validation checks whether a string is syntactically valid JSON according to the specification (RFC 8259). Valid JSON must follow strict rules: strings use double quotes, keys must be quoted, no trailing commas, no comments, and values must be strings, numbers, booleans, null, objects, or arrays.
Common JSON errors and how to fix them:
{"a": 1, "b": 2,} — remove the comma after the last item{'key': 'value'} — replace with double quotes{key: "value"} — add double quotes around the key// this is a comment — JSON does not support comments; remove them{"key": undefined} — use null insteadWhen our validator finds an error, it reports the line number and character position along with a descriptive message explaining what went wrong and how to fix it.
After validating your JSON, you can format it for readability or minify it for production. If you need to transmit JSON in a text-only channel, consider Base64 encoding.