JSON vs XML
Complete comparison of JSON and XML data formats. Learn the differences in syntax, performance, use cases, and when to choose each format.
JSON and XML are the two most common data interchange formats. JSON has largely replaced XML for web APIs and modern applications, but XML remains essential in specific domains.
Quick Comparison
| Feature | JSON | XML |
|---|---|---|
| Syntax | Curly braces + arrays | Tags with open/close |
| Data types | String, number, boolean, null, object, array | Everything is text |
| Readability | More concise | More verbose |
| Parsing speed | Native in JavaScript, fast | Requires XML parser |
| Schema validation | JSON Schema | XSD, DTD, Relax NG |
| Comments | Not supported | Supported |
| Namespaces | Not supported | Supported |
| File size | 30-50% smaller | Larger due to closing tags |
When to Use JSON
REST APIs and GraphQL responses
Configuration files (`package.json`, `tsconfig.json`)
NoSQL databases (MongoDB, CouchDB)
Real-time messaging (WebSocket, Kafka)
Single-page applications
When to Use XML
SOAP web services (legacy enterprise systems)
Document markup (HTML is technically XML-adjacent)
SVG graphics
RSS/Atom feeds
Systems requiring namespaces or advanced schema validation
Converting Between Formats
Use our JSON to XML Converter to transform JSON documents into XML, or the XML to JSON Converter for the reverse direction — both run 100% client-side.
Related Tools
Written by JSON Studio
Engineering Team