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JSON vs XML: Why JSON Won the Web

D

Dayang

• 5 min read

The Early Days: XML's Reign

In the early 2000s, XML (eXtensible Markup Language) was the king of data exchange. It was powerful, strict, and verbose.

<user>
  <id>1</id>
  <name>John Doe</name>
</user>

Enterprises loved it. SOAP APIs were the standard. But developers hated it. Parsing XML in JavaScript was a nightmare of DOM traversals and complexity.

The Rise of JSON

Douglas Crockford popularized JSON (JavaScript Object Notation), and it changed everything.

{
  "id": 1,
  "name": "John Doe"
}

Why JSON Won

  1. Simplicity: It maps directly to data structures (objects and arrays) in most programming languages.
  2. Size: JSON is significantly lighter than XML because it lacks closing tags.
  3. JavaScript Native: JSON.parse() is built into the browser.

Is XML Dead?

Not quite. XML is still widely used in:

  • Enterprise Legacy Systems: Banks and insurance companies rarely rewrite working SOAP APIs.
  • Configuration: SVG images, Android layouts, and RSS feeds are all XML-based.

However, for modern Web APIs, JSON is the undisputed winner. That's why our JSON Formatter is one of our most popular tools!