JSON syntax check

JSON Validator

Validate JSON syntax locally, locate common parsing errors and inspect the structure of valid objects, arrays and primitive JSON values.

Input

Paste JSON to validate

Local

The validator does not rewrite invalid input. It reports the parser message and line/column when the browser exposes a position.

Up to 5 million characters
Output

Validation result

Waiting for input
JSON result will appear here

Valid input produces structure details and reusable output. Invalid input shows a readable syntax diagnostic.