Pro RESTful APIs with Micronaut: Build Java-Based Microservices with REST, JSON, and XML

© The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2025

S. PatniPro RESTful APIs with Micronauthttps://doi.org/10.1007/979-8-8688-1243-9_3

3. Introduction: XML and JSON

Sanjay Patni¹  

(1)

Milpitas, CA, USA

 

This chapter introduces basic concepts about XML and JSON. At the end of this chapter, there is an exercise to demonstrate XML and JSON responses from a Micronaut app.

What Is XML?

Extensible Markup Language (XML) is a text-based markup language which is a standard for data interchange on the Web. As with HTML, you identify data using tags (identifiers enclosed in angle brackets, like this: <...>). Collectively, the tags are known as “markup.” It puts a label on a piece of data that identifies it (e.g., <message>...</message> ...