JSON Validator
Instantly check whether your JSON is syntactically valid. Paste your JSON and click Validate — get a clear valid/invalid result with the exact error location. Free, no upload.
Frequently Asked Questions
What is JSON validation?
JSON validation checks whether a JSON string conforms to the JSON specification. A valid JSON document has correct syntax — proper quoting, commas, brackets, and value types.
How do I validate JSON online?
Paste your JSON into the input and click Validate JSON. A green checkmark confirms valid JSON. If invalid, the exact syntax error is shown so you can fix it.
What errors does this JSON validator detect?
It detects all JSON syntax errors: unclosed brackets, missing commas, unquoted keys, trailing commas, invalid values, and more.