An honest comparison of JSON and XML — speed, readability, tooling, validation, and where each still makes sense.
The short answer
Use JSON for APIs and modern apps. Use XML when you need schema validation, namespaces, or legacy enterprise systems.
JSON wins on
Compactness (about 40% smaller), native JavaScript support, cleaner syntax, better modern tooling.
XML still wins on
Schema validation (XSD), namespace support, mixed content, XSLT, and industries that mandate it (SOAP, banking, government).
Why both exist in 2025
JSON dominates new projects. XML is not going anywhere in regulated industries where validation is a feature.
Format and validate
Use our JSON Formatter to beautify or minify JSON instantly.