JSON Validator
Developer Tools
Validate JSON syntax
How to Use
- 1. Paste or type your JSON in the input field
- 2. Click "Validate JSON" to check if the JSON is valid
- 3. Click "Format JSON" to pretty-print your JSON
- 4. Use the copy button to copy the result
Example / Use Case
Check API Errors Before Deployment
A developer receives JSON from an API and needs to validate it before processing. They paste it into the validator and discover a missing quote error.
Input
JSON: {"name":"John","age":30,"city":New York}Output
❌ Invalid JSON Error at line 1: Expected string value for "city" Hint: Add quotes around string values
How It Works
JSON validation is the process of verifying that JSON data follows the correct syntax rules. Unlike formatting which makes JSON readable, validation ensures the JSON is structurally correct and can be parsed by any JSON parser.
Common JSON syntax errors include missing quotes around keys or string values, trailing commas in arrays or objects, unmatched brackets or braces, and invalid data types. The validator checks for all these issues and reports them with specific line numbers when possible.
This tool uses a strict JSON parser that follows RFC 8259 standards. It can detect both fatal errors that prevent parsing and warnings about potentially problematic patterns. For JSON that needs to be readable after validation, use the JSON Formatter tool.
How to Use
- 1Paste your JSON code into the input area
- 2Click the "Validate" button
- 3View validation results with error details
- 4Fix errors indicated by line numbers and fix suggestions
Frequently Asked Questions
JSON validation checks if JSON syntax follows the correct format including quotes, brackets, commas, and valid data types.