JSON vs XML: Which Should You Use?

JSON and XML solve the same problem — structured data interchange — but they come from different eras and make different trade-offs.

Syntax weight

XML is verbose with opening and closing tags:

<user><name>Alice</name><age>30</age></user>

JSON is lighter:

{ "user": { "name": "Alice", "age": 30 } }

For the same data, JSON is typically smaller and faster to parse, which is why APIs largely moved to it.

Feature comparison

Feature	JSON	XML
Attributes	No	Yes
Comments	No	Yes
Namespaces	No	Yes
Schema validation	JSON Schema	XSD/DTD
Native types	Yes (number, bool, null)	No (all text)
Mixed content	No	Yes

Where each wins

Use JSON for:

• REST APIs and web services
• JavaScript-heavy apps (it's native)
• Mobile and bandwidth-sensitive contexts

Use XML for:

• SOAP and many enterprise/government systems
• Documents with mixed text and markup (like HTML)
• Cases needing namespaces or rich schema validation

The trend

JSON dominates new web development, while XML persists in legacy, enterprise, and document-centric domains. You'll meet both.

Need to convert?

Use the JSON to XML converter to move data between the two formats in either direction.