Online JSON Validator

Check your JSON for syntax errors with precise line and column reporting.

Paste any JSON to validate it against the RFC 8259 specification. JSONNeat points to the exact location of any error.


What makes JSON valid?

Valid JSON requires double-quoted keys and strings, no trailing commas, no comments, properly matched braces/brackets, and only the allowed primitive types: string, number, boolean, null, object and array.

Frequently asked questions

What does the JSON validator check?
It checks that your JSON conforms to the RFC 8259 specification — proper quoting, matched braces and brackets, valid commas, and correct primitive types.
Why is my JSON invalid?
The most common causes are trailing commas, single quotes, unquoted keys, comments (which JSON does not allow), and unescaped control characters in strings.
Does the validator show me where the error is?
Yes. When parsing fails, JSONNeat reports the exact line and column of the first syntax error.
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