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JSON vs XML

Data objects vs Document trees.

XML was the standard before JSON took over the web. Its main advantage is "metadata through attributes", allowing you to attach info to a node without nesting. Today, it remains relevant in industries where strict validation and document-style data are paramount.

Why choose XML?

  • Supports attributes and mixed content.
  • Strict validation with XSD/DTD.
  • Powerful transformation with XSLT.
  • Better for complex document structures.

Trade-offs

  • Very verbose (heavy bandwidth).
  • Parsing requires specialized DOM/SAX libraries.
  • Does not map directly to JS arrays/objects.

Best Use Cases

1
Enterprise SOAP web services.
2
Document publishing (Office, SVG, XHTML).
3
Telecommunications configuration.
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Visual Comparison

Example Payload
Standard JSON
{
  "book": {
    "title": "Clean Code",
    "author": "Robert C. Martin",
    "year": 2008
  }
}

* High symbol redundancy, repeatable keys.

XML Format
<book>
  <title>Clean Code</title>
  <author>Robert C. Martin</author>
  <year>2008</year>
</book>

* Specialized for xml use cases.

Structure

JSON maps to HashMaps. XML maps to Trees.

Safety

JSON is simple data. XML offers strict schemas.

Parsers

XML parsers are available in all major languages.