ConvertersLesson 30Free preview

JSON to Java

This lesson is part of Web Developer Tools · All levels

Summary

The JSON to Java converter produces a POJO class with a field that matches the key name on the JSON. Each field has a type such as a String, int, boolean, or List, and can be equipped with a getter and a setter. To read JSON into an object, use a library like Jackson or Gson with a mapping annotation when the field name is different. The resulting converter needs to be adjusted to the Java naming rules and the possible value null.

Key points

Creating a POJO class with a field according to the JSON key
The type of field is selected based on the value, e.g. String or int
Annotations like @JsonProperty help map specific key names
Jackson and Gson is a popular library for serialization
The name of the Java field is generally camelCase, as opposed to the JSON key

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