JSON Validator
Validate JSON syntax instantly and locate syntax errors by exact line and column numbers. Runs 100% in your browser for complete data privacy.
Accurate syntax validation & error location
Troubleshooting malformed JSON files can be frustrating when dealing with thousands of lines. FileKinetix parses your JSON structure and pinpoints missing quotes, dangling commas, unmatched brackets, and invalid types with precise line and column numbers.
Instant error recovery & formatting
Once your JSON passes validation, you can format it with a single click to ensure standard indentation and clean syntax before deploying to production.
How to validate JSON syntax
- Paste your JSON content into the editor or upload a .json file.
- The validator inspects syntax automatically and displays real-time status.
- If errors exist, check the highlighted line number and error description.
- When valid, click 'Format / Prettify' to clean up indentation.
Frequently Asked Questions
Why is my JSON invalid?
Common JSON syntax issues include trailing commas after the last item, single quotes instead of double quotes around keys and strings, and unquoted property names.
Are my JSON payloads kept private?
Yes. Processing takes place entirely within your browser and is never transmitted to any external server.
Does this validate JSON Schema?
This tool validates standard RFC 8259 JSON syntax. It ensures the structure is syntactically correct and parsable by any JSON parser.