XSD to JSON Schema Converter online

Comprehensive developer suite: Convert XSD to JSON Schema, generate JSON Schema from JSON objects, and create sample JSON data from XSD definitions.

Client-Side Processing
Draft 07 Compatible
Instant Validation
⚡ Instant Conversion 🔒 Privacy Guaranteed ✅ Draft-07 Compatible 🚫 No File Uploads Needed

XSD Input

JSON Schema Output

Common XSD Edge Cases We Handle

1. complexType → Object

Nested structures are preserved. XSD complexType definitions automatically become JSON Schema "type": "object" properties.

XSD 
<xs:complexType name="User">
  <xs:sequence>
    <xs:element name="id" type="xs:int"/>
  </xs:sequence>
</xs:complexType>
JSON Schema 
"User": {
  "type": "object",
  "properties": {
    "id": { "type": "integer" }
  }
}

2. maxOccurs="unbounded"

elements with maxOccurs="unbounded" are correctly interpreted as arrays, wrapping the item definition in an items property.

XSD 
<xs:element name="tag" 
  type="xs:string" 
  maxOccurs="unbounded"/>
JSON Schema 
"tag": {
  "type": "array",
  "items": { "type": "string" }
}

3. XML Attributes

XSD attributes (xs:attribute) are treated as regular JSON properties, often added to the required list if use="required".

XSD 
<xs:attribute name="lang" 
  type="xs:string" 
  use="required"/>
JSON Schema 
"properties": {
  "@lang": { "type": "string" }
},
"required": ["@lang"]

Developer's Guide to Schema Tools

Whether you are migrating from legacy XML systems or building modern REST APIs, schema validation is critical. Our suite offers three powerful modes to help your workflow:

1. XSD to JSON Schema Converter

Perfect for migrating SOAP/XML services to REST/JSON. It takes your rigorous XML Schema Definitions (XSDs) and converts them into standard JSON Schema (Draft 07). It preserves types like xs:string, xs:integer, and structure constraints like minOccurs/maxOccurs.

2. JSON to JSON Schema Generator

The fastest way to document an API. Simply paste a sample JSON response payload, and our tool infers the entire schema structure. It detects arrays, nested objects, nullable fields, and selects appropriate data types automatically.

3. XSD to JSON Sample Generator

Need dummy data for testing? This mode takes an XSD file and generates a valid JSON object that conforms to the schema. Great for seeding databases or mocking API endpoints before the backend is built.

Deep Dive Resources

Comparison: XSD vs JSON Schema

Feature XML Schema (XSD) JSON Schema
Data Model Tree of Elements & Attributes Objects, Arrays, Primitives
Usage SOAP, Enterprise Java, Configs REST APIs, NoSQL, Configs
Complexity High (Namespaces, types) Medium (Composition based)
Validation Strict, Type-heavy Structural, Constraint-based

Frequently Asked Questions

How to generate JSON Schema from a JSON object?
Select the "JSON → JSON Schema" tab above. Paste your JSON data (object or array) into the left panel and click "Generate Schema". The tool will create a ready-to-use JSON Schema based on your data's structure and types.
Can I convert complex XSD types to JSON Schema?
Yes. Our engine handles key XSD concepts: complexTypes become JSON properties, sequences suggest property order (though JSON is unordered), and simpleTypes with restrictions are mapped to JSON Schema `enum` or `pattern` constraints where possible.
Is the XSD converter free?
Yes, it is 100% free and open for unlimited use. There are no daily limits, and since it runs in your browser, it's extremely fast even for large schemas.
How to create mock JSON from XSD?
Use the "XSD → JSON Sample" tab. Input your XSD, and the tool will generate a "dummy" JSON object filled with placeholder strings, numbers, and booleans that satisfy the schema's requirements.
Is this compatible with Draft 07/2019-09?
The output is generated targeting JSON Schema Draft 07, which strikes the best balance between modern features and compatibility with major validators in Python, Java, and Node.js.
Can I use this for API validation?
Absolutely. The schemas generated here can be dropped directly into libraries like `ajv` (Node.js), `jsonschema` (Python), or framework middleware to validate incoming API requests automatically.