What is JSON Validation?
JSON validation checks if your JSON data follows the correct syntax rules. Valid JSON must have properly matched brackets, quoted strings, correct comma placement, and valid data types.
Common JSON Errors
- Missing Commas: Forgot comma between properties
- Trailing Commas: Extra comma after last property (invalid in JSON)
- Single Quotes: JSON requires double quotes, not single
- Unquoted Keys: Property names must be in double quotes
- Unclosed Brackets: Missing closing ] or }
Why Validate JSON in 2026?
Development
- Debug API responses quickly
- Fix configuration file errors
- Validate before deployment
- Catch syntax errors early
Data Quality
- Ensure data integrity
- Prevent import/export errors
- Validate user inputs
- Test JSON generators
How to Fix Invalid JSON
Step 1: Identify the Error
Our validator shows the exact line and column where the error occurs
Step 2: Try Auto-Fix
Click the "Try Auto-Fix" button to automatically correct common issues
Step 3: Manual Correction
If auto-fix doesn't work, manually correct based on the error message
Step 4: Re-validate
Click "Validate JSON" again to ensure all issues are fixed
Example: Common Fixes
Invalid (single quotes):
{"name": 'John'}Valid (double quotes):
{"name": "John"}