Validate, format, and beautify JSON code instantly. Identify syntax errors and fix them with one click.
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📖 Common JSON Syntax Rules
Rule
Correct Example
Incorrect Example
Keys must be in double quotes
{"name":"John"}
{name:"John"}
Strings in double quotes
{"city":"Delhi"}
{city:'Delhi'}
No trailing commas
[1,2,3]
[1,2,3,]
Only these data types
String, Number, Boolean, Null, Object, Array
Undefined, Function, Date
📝 Frequently Asked Questions
❓ What is a JSON Validator? ▼
A JSON Validator checks if your JSON code follows proper syntax rules. It identifies errors like missing quotes, trailing commas, or incorrect data types. This tool also beautifies and formats your JSON for better readability.
❓ How to fix common JSON errors? ▼
Common errors: 1) Use double quotes for keys and strings. 2) Remove trailing commas. 3) Ensure brackets [] and braces {} are properly closed. 4) Use null instead of undefined. This validator shows exact line and position of errors.
❓ What's the difference between JSON and JavaScript Object? ▼
JSON is a strict text format derived from JavaScript objects. JSON requires double quotes for all keys and strings, no comments, no trailing commas, and only specific data types. JavaScript objects are more flexible.
❓ Can I validate large JSON files? ▼
Yes, this validator can handle large JSON files up to several MB. However, for extremely large files (100MB+), desktop tools may perform better.
❓ Is my data secure when using this tool? ▼
Yes! This tool processes all JSON data locally in your browser. No data is sent to any server. Your JSON code never leaves your device.
💡 Tip: Use Ctrl+Shift+F (Cmd+Shift+F on Mac) to format code, Ctrl+Shift+M to minify. All processing happens in your browser — 100% private and secure.