JSON to JSON Schema Converter
Generate JSON Schema from your JSON data automatically
JSON Input
Paste your JSON data here
Example JSON
Click to load example JSON data
JSON Schema Output
Generated JSON Schema
Schema Features
Type Inference
Automatically detects string, number, boolean, null, object, and array types
Nested Objects
Handles deeply nested objects and generates proper schema structure
Array Support
Detects array item types and handles mixed-type arrays with anyOf
Required Fields
Optionally marks all present fields as required in the schema
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About JSON Schema
What is JSON Schema?
JSON Schema is a vocabulary that allows you to annotate and validate JSON documents. It describes the structure, data types, and constraints of your JSON data, making it easier to validate, document, and generate code from your APIs.
Schema Structure
$schema: Specifies the JSON Schema version being used
type: Defines the data type (string, number, object, array, boolean, null)
properties: Describes the properties of an object
required: Lists which properties must be present
items: Defines the schema for array elements
Common Use Cases
- API documentation and validation
- Data validation in web forms
- Configuration file validation
- Code generation from schemas
- Database schema documentation
- Contract testing between services
- IDE autocomplete and IntelliSense
Supported Data Types
string
Text values
number
Numeric values
boolean
true/false
object
Key-value pairs
array
Ordered lists
null
Null values
Schema Versions
This tool supports both JSON Schema Draft 07 (widely used) and Draft 2020-12 (latest). Draft 07 is recommended for maximum compatibility with existing tools and libraries. Draft 2020-12 includes new features like unevaluatedProperties and prefixItems.