JSON vs XML: Which Should You Use?
JSON and XML both structure data, but JSON is lighter and XML is more expressive. Compare syntax, size, features, and ideal use cases.
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.
Got a file to check?
Paste it in. Errors come back in plain English.