Ensure your JSON data is syntactically correct with our comprehensive validator. Detect errors, get precise line numbers, and debug issues quickly for APIs, configuration files, and data exchange.
Check your JSON syntax and get detailed error reporting with line numbers
Follow these simple steps to check your JSON syntax and identify errors
Copy and paste your JSON data into the input area or load a sample to test the validator.
Click the validate button to check your JSON syntax and identify any errors or issues.
Review the validation results and fix any reported errors using the provided line numbers.
Professional-grade features for comprehensive JSON syntax validation and error detection
Comprehensive syntax checking with detailed error reporting and exact line number identification.
All JSON validation is done locally - your data never leaves your device.
Real-time JSON validation with immediate error detection and detailed feedback.
Get specific error messages with line numbers and character positions for quick debugging.
Fully responsive design works perfectly on smartphones, tablets, and desktops.
Critical tool for API development, configuration validation, and data quality assurance.
Learn about frequent JSON syntax issues and how to fix them
| Error Type | Example | Fix | Description |
|---|---|---|---|
| Missing Comma | "name": "John" "age": 30 | "name": "John", "age": 30 | Add comma between properties |
| Trailing Comma | ["a", "b", "c",] | ["a", "b", "c"] | Remove trailing comma |
| Unquoted Keys | {name: "John"} | {"name": "John"} | Quote all property names |
Get answers to common questions about JSON validation and syntax checking
Valid JSON requires proper syntax: quoted strings, correct bracket/brace matching, no trailing commas, and proper data types. Our validator checks all these rules and provides specific error locations.
JSON validation prevents runtime errors, ensures API compatibility, and helps debug data exchange issues. It's essential for configuration files, API responses, and data storage.
Yes, our validator provides detailed error messages including line numbers and character positions to help you quickly identify and fix JSON syntax issues.
Common errors include missing commas, unmatched brackets, unquoted property names, trailing commas, and incorrect string escaping. Our validator identifies these specific issues.
Absolutely. All JSON validation is performed locally in your browser. Your data never leaves your device and is not transmitted to any servers.
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