JSON vs XML: what is the difference?
Advanced Topics
JSON and XML both store structured data, but JSON is a lightweight data format while XML is a verbose markup language. For most modern web APIs, JSON is smaller, faster to parse, and easier to read, which is why it has become the default. XML still appears in enterprise, financial, and document-heavy systems.
| Aspect | JSON | XML |
|---|---|---|
| Type | Data format | Markup language |
| Syntax | Key-value pairs & arrays | Nested tags |
| Size | Smaller / less verbose | Larger (open + close tags) |
| Comments | Not supported | Supported |
| Best for | Web APIs, configs | Documents, enterprise systems |
JSON example
{ "user": { "name": "Ada" } }XML example
<user><name>Ada</name></user>When to use which
- Choose JSON for web/mobile APIs, microservices, and config, where speed and simplicity win.
- Choose XML for highly structured documents, mixed content, or systems that mandate it (many banking/enterprise integrations).
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