XML to JSON and JSON to XML

Est. read: 7 minDeveloper

XML structure converting into JSON objects

Summary

Definition: XML and JSON are different data models that require explicit rules to convert between.

Why it matters: Incorrect assumptions can silently drop data or change meaning.

Pitfall: Attributes, order, and mixed content are easy to lose.

Guide start

XML and JSON both represent structured data, but they use different data models.
Reliable conversion requires explicit mapping rules and acceptance of tradeoffs.

Key terms

XML element: A tagged structure that contains data or other elements.
Attribute: Name-value metadata attached to an XML element.
Mixed content: Text and elements interleaved in XML.
Convention: A chosen rule not defined by a standard.
Schema: Rules that describe valid structure and data.

XML and JSON data models

XML vs JSON

XML

Elements, attributes, ordered content.

JSON

Objects, arrays, unordered members.

Both

Text-based data formats.

XML is often document-centric, while JSON is data-centric.

Standards note

There is no universal, lossless mapping between arbitrary XML and JSON.

The W3C defines a specific XML representation of JSON for XPath, XQuery,
and XSLT. It does not define a general XML to JSON conversion.

Mapping elements and attributes

XML attributes have no direct equivalent in JSON. You must choose a convention,
such as storing attributes under a prefixed key.

Common mix-up: XML attributes do not automatically become JSON object keys.

Example

A simple XML element with an attribute.

XML input

<user id="42">Ada</user>

Example

One possible JSON representation using conventions.

JSON output

{
  "user": {
    "@id": "42",
    "#text": "Ada"
  }
}

Different tools may use different keys or structures for attributes and text.

What does not convert cleanly

XML mixed content.
XML namespaces.
Element ordering significance.
Comments and processing instructions.

When not to convert

Avoid conversion when document order, mixed content, or namespaces carry meaning.
JSON cannot represent these features reliably.

Practical validation

Practical check

Define attribute and text conventions.
Convert XML to JSON.
Validate JSON output.
Convert back only if required.
Validate XML against schema if available.

Use with Encrypt Online

Convert data using XML to JSON.
Generate XML using JSON to XML.
Validate formats before and after conversion.

FAQ

Is there a standard XML to JSON mapping? No. All XML to JSON mappings involve conventions and tradeoffs.

Do repeated XML elements become arrays? Often yes, but this is a convention, not a requirement.

Will comments convert? No. Comments and processing instructions are dropped.

Guide end - You can now convert XML and JSON with clear expectations and safer defaults.Back to top