Free JSON Validator Online
Validate JSON syntax with detailed error messages and line numbers.
Key Features
✅ Instant Validation
Validate JSON syntax instantly as you type with real-time feedback.
🔍 Error Details
Get detailed error messages with line and column numbers for quick fixes.
⚡ Format & Minify
Beautify or compress JSON with a single click.
🔒 Privacy Protected
Your data never leaves your browser. No server storage.
How to Use JSON Validator
Paste Your JSON Code
Enter or paste your JSON data into the input area.
Choose an Action
Select "Validate" to check syntax, "Format" to beautify, or "Minify" to compress.
View the Result
See validation results with error details or the formatted/minified JSON in the output area.
Frequently Asked Questions
Basics
What is JSON validation?
JSON validation is the process of checking whether a JSON string follows the correct JSON syntax rules, including proper use of quotes, commas, brackets, and data types.
Why should I validate JSON?
Validating JSON ensures that your data can be correctly parsed by applications. Invalid JSON causes parsing errors and can break APIs, configurations, and data exchanges.
Common Errors
What are common JSON errors?
Common JSON errors include: missing or trailing commas, unquoted keys, single quotes instead of double quotes, missing closing brackets, and comments (which JSON does not support).
Does JSON support comments?
No, the JSON specification does not support comments. Any comment syntax like // or /* */ will cause a JSON parse error.