The validator parses your JSON with the browser’s strict JSON parser, reports the line and column of the first error, and shows the type, key count and nesting depth of valid JSON.
How to validate JSON
- Paste the JSON.
- Read the result: ✓ Valid JSON, or the location of the first error.
- Fix the error and the check runs again automatically.
JSON vs JavaScript objects
JSON is stricter than JavaScript: keys must be double-quoted strings, there are no comments or trailing commas, and only strings, numbers, booleans, null, arrays and objects are allowed.
Frequently asked questions
What is JSON Lint?
JSON Lint is a common name for a JSON validator. This tool does the same check.
Updated October 2026 · Built and tested by Sharjeel Tahir · How our tools are tested