JSON Validator
Check if your JSON is valid and find the exact location of errors.
What is JSON validation?
JSON validation checks whether a piece of text follows the JSON specification. Valid JSON can be parsed by any JSON library; invalid JSON will cause errors.
Common JSON errors
- Unquoted keys (must be double-quoted)
- Single quotes instead of double quotes
- Trailing commas
- Comments (not allowed in JSON)
- Unescaped control characters
Privacy
Validation happens entirely in your browser. Nothing is uploaded to any server.
Frequently Asked Questions
Is this JSON Validator free?
Yes, completely free. No signup, no limits.
Is my JSON uploaded?
No. Validation happens in your browser.
What counts as valid JSON?
Valid JSON follows RFC 8259: strings in double quotes, no trailing commas, no comments, and values must be objects, arrays, strings, numbers, booleans, or null.
Does it show where the error is?
Yes. When possible, the exact line and column of the error are shown.
Can it validate large files?
Yes, up to a few MB. For very large files, use a streaming validator on the server.