JSON Validator
Validate JSON syntax online. Check for errors with line numbers, format, minify, and explore with tree view.
What is JSON Validation?
JSON validation checks whether a string is syntactically correct JSON according to the RFC 8259 specification. Valid JSON requires double-quoted keys, no trailing commas, no single quotes, and proper nesting of objects and arrays. This validator pinpoints errors with exact line numbers and descriptions to help you fix issues quickly.
Common Use Cases
- •Checking API request/response bodies for syntax errors
- •Validating JSON configuration files before deployment
- •Debugging JSON parse errors in application logs
- •Verifying JSON output from code generators or templates
- •Ensuring JSON files are valid before committing to git
Frequently Asked Questions
What are the most common JSON syntax errors?
Trailing commas after the last item, single quotes instead of double quotes, unquoted keys, comments (JSON doesn't support comments), and missing commas between items. This validator catches all of these with clear error messages.
Is JSON5 the same as JSON?
No. JSON5 is an extension that allows comments, trailing commas, single quotes, and unquoted keys. Standard JSON (RFC 8259) does not support any of these. Most APIs and configuration systems expect standard JSON.