Online JSON to JSON Schema Generator
Convert raw JSON data into a structured JSON Schema instantly with this free online generator. Paste your JSON input and the tool automatically analyzes its structure, detects data types, and generates a standards-compliant JSON Schema. Ideal for API development, backend validation setup, frontend integration, and data modeling.
What is JSON Schema?
JSON Schema is a standard format used to describe and validate the structure of JSON data. It defines what properties are allowed, which fields are required, what data types are expected, and any additional rules such as minimum length, numeric limits, or specific formats.
In simple terms, JSON Schema acts like a blueprint for your JSON data. It ensures that incoming or outgoing JSON follows a predefined structure, making applications more reliable and predictable.
Why JSON Schema is Important
- Ensures consistent data structure
- Validates API request and response payloads
- Prevents invalid or malformed JSON input
- Improves backend and frontend integration
- Helps generate documentation automatically
Basic Example
JSON Data
{
"name": "John",
"age": 30,
"active": true
}Corresponding JSON Schema
{
"type": "object",
"required": ["name", "age"],
"properties": {
"name": { "type": "string" },
"age": { "type": "integer" },
"active": { "type": "boolean" }
}
}In this schema:
type: "object"defines the root structurerequiredspecifies mandatory fieldspropertiesdefines allowed keys and their data types
Where JSON Schema is Used
- REST API validation
- Backend input validation
- Frontend form validation
- Database modeling
- Configuration file validation
This section converts your JSON data into a complete JSON Schema definition. The generator detects object properties, nested structures, arrays, required fields, and data types such as string, number, integer, boolean, and null automatically.
Features List
- Automatic type detection
- Nested object and array schema support
- Required property detection
- Integer vs number detection
- Clean formatted schema output
- Copy and download options
- Works fully in browser
JSON Input:
Use this section to validate your JSON data against a JSON Schema definition. Paste both your JSON and Schema to verify structure correctness, required properties, and data types. Validation errors are displayed clearly with field paths to help debugging and integration.
JSON Data
Validation Result
Related: