jsonschema2xsd

JSON Schema (Draft-03) conversion to XSD.

Install

$ git clone https://github.com/donniegallardo/jsonschema2xsd.git
$ cd  jsonschema2xsd/
$ npm install -g

Running the program

$ jsonschema2xsd

Example command usage:

Command	Description
jsonschema2xsd -h	Displays help
jsonschema2xsd schema.xsd	Converts schema file to xsd
jsonschema2xsd -f schema.xsd	Converts schema file to xsd
jsonschema2xsd -u https://.../basicschema.json	Converts schema to xsd
`cat schema.json	jsonschema2xsd`

Sample JSON Schema

{
    "title": "Person",
    "type": "object",
    "properties": {
        "firstName": {
            "type": "string"
        },
        "lastName": {
            "type": "string"
        },
        "age": {
            "description": "Age in years",
            "type": "integer",
            "minimum": 0
        }
    }
}

Sample XSD Schema generated by the tool

<?xml version="1.0"?>
<xs:schema 
  xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:element name="Person">
    <xs:complexType>
      <xs:sequence>
        <xs:element name="firstName" type="xs:string"/>
        <xs:element name="lastName" type="xs:string"/>
        <!--Age in years-->
        <xs:element name="age">
          <xs:simpleType>
            <xs:restriction base="xs:integer">
              <xs:minInclusive value="0"/>
            </xs:restriction>
          </xs:simpleType>
        </xs:element>
      </xs:sequence>
    </xs:complexType>
  </xs:element>
</xs:schema>

LIMITATIONS

• Keywords for numbers
  • divisibleBy draft-03
• Keywords for strings
  • [formatMaximum / formatMinimum and formatExclusiveMaximum / formatExclusiveMinimum] (v5)
• Keywords for arrays
  • maxItems/minItems
  • uniqueItems
  • additionalItems
• Keywords for objects
  • maxProperties/minProperties
  • required draft-v04
  • patternProperties
  • additionalProperties
  • dependencies
• Keywords for all types
  • constant
  • not
  • oneOf
  • anyOf
  • allOf
  • switch

REFERENCES

• https://tools.ietf.org/rfcdiff?url1=draft-zyp-json-schema-03.txt&url2=draft-zyp-json-schema-04.txt
• https://docs.oracle.com/cd/E12461_01/140/funtional_artifacts_guide/or-fasg-standards.htm
• http://www.informatik.uni-ulm.de/pm/fileadmin/pm/home/fruehwirth/drafts/Bsc-Nogatz.pdf
• https://github.com/highsource/jsonix-schema-compiler/wiki/JSON-Schema-for-XML-Schema
• https://spacetelescope.github.io/understanding-json-schema/
• https://www.w3.org/TR/xmlschema-0/#OccurrenceConstraints
• http://www.datypic.com/books/defxmlschema/examples.html
• https://devutilsonline.com/xsd-xml/generate-xml-from-xsd
• http://json-schema.org/

It's still a work in progress... Code has not been refactored, prettified or modularized as of this moment. Currently on prototyping phase. No automated test as of the moment.