Developer Tools
JSON to XML Schema Converter
Paste sample JSON and get a complete XML Schema (XSD) instantly. OpenToolLab's converter generates validation schemas entirely in your browser — your data never leaves your device.
Generated XSD
What makes this tool different
Automatic XSD generation
The converter infers XML Schema types from JSON data, creating complete type definitions automatically.
Nested type support
Deeply nested JSON generates complete XSD with complexType definitions for each level of nesting.
Attribute handling
JSON properties with @ prefix are mapped to XML attributes in the generated schema.
100% client-side
All generation happens in your browser. Your data is never uploaded to any server.
About this tool
JSON to XML Schema Converter: everything you need to know
XML Schema (XSD) defines the structure and validation rules for XML documents. When you are building systems that exchange XML data — SOAP services, enterprise integrations, document workflows — you need an XSD to validate incoming and outgoing XML. Generating an XSD from sample data is faster and less error-prone than writing it by hand.
OpenToolLab's free JSON to XML Schema converter creates complete XSD files from sample JSON data. Paste a JSON object that represents your desired XML structure, and the converter generates a fully valid XSD with element definitions, complex types, attribute declarations, and data type mappings. The output follows the XSD 1.0 specification and works with all standard XML validators.
Privacy is guaranteed because all generation happens in your browser. Your sample data — which may contain real API responses, production configurations, or sensitive structures — never leaves your device. There is no server processing and no data collection.
The converter correctly maps JSON data types to XSD types. Strings become xs:string, numbers become xs:decimal or xs:integer, booleans become xs:boolean, and null values become xs:anyType. Nested objects generate complexType definitions with element children. Arrays generate repeated element definitions. Properties prefixed with @ are mapped to XML attributes.
Common use cases include generating XSD for SOAP web services, validating XML configuration files, creating data contracts for enterprise integrations, documenting XML structures, and converting API specifications from JSON to XML formats. The tool is essential for developers working with both JSON and XML ecosystems.
OpenToolLab imposes no limits. Generate as many schemas as you need, from any size sample data, with no signup and no premium tier.
FAQ
JSON to XML Schema Converter — frequently asked questions
What is a JSON to XML Schema converter?
A JSON to XML Schema converter generates an XSD (XML Schema Definition) file from sample JSON data. The XSD defines the structure, data types, and validation rules for XML documents.
How do I generate an XSD from JSON?
Paste your sample JSON into OpenToolLab's converter and click Generate. The tool creates a complete XSD with element definitions, complex types, and attribute declarations.
What is XML Schema (XSD)?
XML Schema Definition (XSD) is a language for defining the structure and data types of XML documents. It validates that XML documents conform to expected formats, similar to JSON Schema for JSON.
Can I convert complex nested JSON to XSD?
Yes. The converter handles deeply nested JSON objects, generating complexType definitions for each level of nesting in the XSD output.
Is this tool free and private?
Yes. All generation happens in your browser. Your sample data is analyzed locally and never sent to any server.
What is the difference between JSON Schema and XSD?
JSON Schema validates JSON data and is used in web APIs. XSD validates XML data and is used in enterprise systems, SOAP services, and document workflows. Both serve the same purpose for their respective formats.
Can I customize the generated schema?
Yes. After generation, you can edit the XSD to add custom constraints, annotations, enumerations, patterns, and min/max values.
How do I validate XML against the generated schema?
Use an XML parser or validator that supports XSD, such as libxml2, lxml (Python), Java's javax.xml.validation, or online XML validators.
Can I export the XSD file?
Yes. Click the download button to save the generated XML Schema as a .xsd file, or copy it to your clipboard.
Does this support all JSON data types?
Yes. Strings, numbers, booleans, null, arrays, and objects are mapped to appropriate XSD types including xs:string, xs:decimal, xs:boolean, and complex types.
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