JSON-to-XML Conversion Rules

This section provides a simple set of JSON-to-XML Conversion Rules that preserves the structure of the original JSON document. You can build your own converter with those rules.

If you are a developer, you may want to implement your own JSON-to-XML converter so that you have the full control of the output.

To implement own JSON-to-XML converter, you need define a set of conversion rules first. Here is my suggestion to build a simple converter that preserves the original XML document structure.

1. Create a root element, <root>...</root>, to store the entire document converted from the JSON document.

2. For a JSON primitive value, convert the value as the text content of the current XML element. You can add XML Schema Instance type, xsi:string, xsi:float, or xsi:boolean, to identify its type, if you want to.

3. For a JSON Null value, convert the value as an empty text content of the current XML element. You can add XML Schema Instance type, xsi:nil, to identify its type, if you want to.

4. For a JSON Array value, convert the value to multiple XML elements by repeating the current XML element. Then loop through each item in the JSON Array to populate each XML element.

5. For a JSON Object value, convert the value to child element of the current XML element. Then loop through each property in the JSON object to populate each child element, by using the property name as the child element tag with "_" to replace any special characters.

Here is a sample XML document, xml.html, that we can use to validate our conversion rules. Note that some elements and attributes are deprecated in latest HTML specifications. But it is still a valid XML document.

{
  "dictionary": {
    "word": [
      {
        "update": {
          "date": "2020-01-01"
        },
        "name": {
          "is acronym": true,
          "value": "DTD"
        },
        "definition": "Document Type Definition",
        "origin": null
        
      },
      {
        "update": {
          "date": "1000-01-01"
        },
        "name": {
          "is acronym": false,
          "value": "Dog"
        },
        "definition": "A domesticated carnivorous mammal",
        "origin": "docga"
      }
    ]
  }
}

If you apply our conversion rules, the converted XML should be:

<root>
  <dictionary>
    <word>
      <name>
        <is_acronym>true</is_acronym>
        <value>DTD</value>
      </name>
      <update>
        <date>2020-01-01</date>
      </update>
      <definition>Document Type Definition</definition>
      <origin></origin>
    </word>
    <word>
      <name>
        <value>Dog</value>
        <is_acronym>false</is_acronym>
      </name>
      <update>
        <date>1000-01-01</date>
      </update>
      <definition>A domesticated carnivorous mammal</definition>
      <origin>docga</origin>
    </word>
  </dictionary>
</root>

I think the output is almost perfect! The original JSON document structure is exactly preserved in the output XML document. But some JSON data type information, like number, boolean or null, is lost in the XML document. What do you think?

Exercise: Build an JSON-to-XML converter in your favorite language using above conversion rules.

Table of Contents

 About This Book

 Introduction of XML (eXtensible Markup Language)

 XML File Syntax

 XML File Browsers

XML-JSON Document Conversion

 What Is JSON (JavaScript Object Notation)

 Convert XML Document to JSON Document

 XML-to-JSON Conversion Rules

 XML-to-JSON Conversion Tool at onlinexmltools.com

 XML-to-JSON Conversion Library for Java

 XML-to-JSON Conversion Module for Python

 Convert JSON Document to XML Document

JSON-to-XML Conversion Rules

 JSON-to-XML Conversion Tool at onlinexmltools.com

 JSON-to-XML Conversion Library for Java

 JSON-to-XML Conversion Module for Python

 DOM (Document Object Model) Programming Interface

 SAX (Simple API for XML) Programming Interface

 DTD (Document Type Definition) Introduction

 Syntaxes of DTD Statements

 Validating an XML Document against the Specified DTD Document Type

 XSD (XML Schema Definition) Introduction

 Syntaxes of XSD Statements

 Validating XML Documents Against Specified XML Schemas

 XSL (Extensible Stylesheet Language) Introduction

 XSLT (XSL Transformations) Introduction

 Java Implementation of XSLT

 XPath (XML Path) Language

 XSLT Elements as Programming Statements

 Control and Generate XML Element in the Result

 PHP Extensions for XML Manipulation

 XML Notepad - XML Editor

 XML Tools Plugin for Notepad++

 XML Plugin Packages for Atom Editor

 XML 1.1 Changes and Parsing Examples

 Outdated Tutorials

 References

 Full Version in PDF/EPUB