JSON vs XML: When to Use Each Format in 2026

JSON vs XML: Key Differences

JSON and XML are both text-based data formats used to transmit structured data. JSON has largely replaced XML for REST APIs, but XML still dominates in enterprise systems, SOAP services, and document formats.

Syntax Comparison

// JSON
{"user": {"name": "Alice", "age": 30, "roles": ["admin", "user"]}}

// XML
<user>
  <name>Alice</name>
  <age>30</age>
  <roles><role>admin</role><role>user</role></roles>
</user>

Comparison Table

When to Use JSON

• REST APIs and web services
• JavaScript applications (native parsing)
• Config files (package.json, tsconfig.json)
• NoSQL databases (MongoDB, DynamoDB)

When to Use XML

• SOAP web services
• Microsoft Office formats (DOCX, XLSX)
• SVG graphics
• RSS/Atom feeds
• Enterprise B2B integrations

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