// free tool
JSON Helper Tool
Format, validate, minify, and convert JSON to TypeScript interfaces, Go structs, and Python classes.
JSON Tool
JSON InputValid
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URL Encoded:
(name~example~age~30~active)~
Formatting and validation update live as you type — no button needed.
Key Features
Format & Minify
- Prettify JSON with customizable indentation
- Minify for production-ready output
- Real-time syntax highlighting
Validation
- Real-time error detection
- Detailed error messages with line numbers
- Supports JSON5 and relaxed syntax
Conversion
- Generate TypeScript interfaces
- Create Go structs
- Convert to Python classes
JSON Best Practices
- Always use double quotes for property names
- Validate JSON before processing in production
- Use proper escaping for special characters
- Consider size limits when working with large JSON files
- Use consistent formatting for better readability
Common JSON Structures
Simple Object
{
"name": "John Doe",
"age": 30,
"isActive": true,
"address": {
"street": "123 Main St",
"city": "New York"
}
}Array of Objects
[
{
"id": 1,
"product": "Laptop",
"price": 999.99
},
{
"id": 2,
"product": "Phone",
"price": 699.99
}
]