XML vs JSON
Complete comparison — when to use which format
Same Data, Two Formats
XML
<?xml version="1.0" encoding="UTF-8"?>
<user>
<name>alice</name>
<roles>
<role>admin</role>
<role>editor</role>
</roles>
<settings theme="dark" notifications="true" />
</user>JSON
{
"name": "alice",
"roles": ["admin", "editor"],
"settings": {
"theme": "dark",
"notifications": "true"
}
}Comparison Table
| Aspect | XML | JSON |
|---|---|---|
| Syntax verbosity | Verbose (tags, attributes, closing tags) | Compact (braces, brackets) |
| Attributes vs keys | Attributes + element content | All key-value pairs |
| Namespaces | Built-in (xmlns) | Convention-based (prefixes) |
| Schemas | XSD (XML Schema Definition) | JSON Schema |
| Transformation | XSLT for styling/transforms | Custom code or libraries |
| Ecosystem | Enterprise, SOAP, configs, docs | Web APIs, modern apps |
| API usage trends | Legacy, declining | Dominant for REST APIs |
Verdict
Use XML when you need namespaces, XSD validation, or XSLT — common in enterprise systems, SOAP, and document formats. Use JSON for modern web APIs, configs, and data exchange — it's lighter, easier to parse in JavaScript, and the de facto standard for REST.
JSON has largely replaced XML for new API design. DuskTools helps you format and validate JSON.