Mapping JSON Values to XML Elements

Q

What is the standard to map JSON values to XML elements?

✍: FYIcenter.com

A

There seems to be no industry standard on how to map JSON values to XML elements.

But there are some commonly used conventions:

1. Automatically adding a root element with "root" or "document" as the element tag. For example:

JSON: 
{
    "a": 1,
    "b": 2
}

XML:
<root>
	<a>1</a>
	<b>2</b>
</root>

2. JSON String and Boolean values are converted to XML text content as is. For example:

JSON: 
{
    "a": "20.20",
    "b": true
}

XML:
<root>
	<a>20.20</a>
	<b>true</b>
</root>

3. JSON Number values are normalized first and then converted to XML text contents. For example:

JSON: 
{
    "a": 20.0200,
    "b": 0.314159e01
}

XML:
<root>
	<a>20.02</a>
	<b>3.14159</b>
</root>

4. JSON Null values are converted to empty XML text contents. For example:

JSON: 
{
    "a": null
}

XML:
<root>
	<a/>
</root>

5. JSON Array values are converted to a sequence of XML sub elements with "element" at the tag. For example:

JSON: 
[
    2,
    4,
    8
]

XML:
<root>
	<element>2</element>
	<element>4</element>
	<element>8</element>
</root>

6. JSON Object values are converted to a sequence of XML sub elements with their property names as element tags. Any illegal characters in XML tag names are placed with "_". XML tag names will be prefixed with "_" if they start with numeric characters. For example:

JSON: 
{
    "a": null,
    "x+y": "X plus Y",
    "x-y": "X minus Y",
    "007": "Double O Seven",
    "fyi.pi": 0.314159e01,
    "fyi:pi": 0.314159e01,
    "fyi_pi": "0.314159e01",
    "fyi>pi": "31.4159e-1",
    "error msg": "Something wrong!"
}

XML:
<root>
  <a/>
  <x_y>X plus Y</x_y>
  <x-y>X minus Y</x-y>
  <_007>Double O Seven</_007>
  <fyi.pi>3.14159</fyi.pi>
  <fyi_pi>3.14159</fyi_pi>
  <fyi_pi>0.314159e01</fyi_pi>
  <fyi_pi>31.4159e-1</fyi_pi>
  <error_msg>Something wrong!</error_msg>
</root>

 

JSON to XML Conversion

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2017-08-29, 105👍, 0💬