Jackson - Change Name of Field

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1. Overview

This quick tutorial illustrates how to change the name of a field to map to another JSON property on serialization.

If you want to dig deeper and learn other cool things you can do with the Jackson 2 – head on over to the main Jackson tutorial.

2. Change Name of Field for Serialization

Working with a simple entity:

public class MyDto {
    private String stringValue;

    public MyDto() {
        super();
    }

    public String getStringValue() {
        return stringValue;
    }

    public void setStringValue(String stringValue) {
        this.stringValue = stringValue;
    }
}

Serializing it will result in the following JSON:

{"stringValue":"some value"}

To customize that output so that, instead of stringValue we get – for example – strVal, we need to simply annotate the getter:

@JsonProperty("strVal")
public String getStringValue() {
    return stringValue;
}

Now, on serialization, we will get the desired output:

{"strVal":"some value"}

A simple unit test should verify the output is correct:

@Test
public void givenNameOfFieldIsChanged_whenSerializing_thenCorrect() 
  throws JsonParseException, IOException {
    ObjectMapper mapper = new ObjectMapper();
    MyDtoFieldNameChanged dtoObject = new MyDtoFieldNameChanged();
    dtoObject.setStringValue("a");

    String dtoAsString = mapper.writeValueAsString(dtoObject);

    assertThat(dtoAsString, not(containsString("stringValue")));
    assertThat(dtoAsString, containsString("strVal"));
}

3. Conclusion

Marshaling an entity to adhere to a specific JSON format is a common task – and this article shows how to do is simply by using the @JsonProperty annotation.

The code backing this article is available on GitHub. Once you're logged in as a Baeldung Pro Member, start learning and coding on the project.

Of course, Azure Container Apps has really solid support for our ecosystem, from a number of build options, managed Java components, native metrics, dynamic logger, and quite a bit more.

To learn more about Java features on Azure Container Apps, visit the documentation page.

You can also ask questions and leave feedback on the Azure Container Apps GitHub page.

Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.

Try a 14-Day Free Trial of Orkes Conductor today.

Orkes is the leading workflow orchestration platform built to enable teams to transform the way they develop, connect, and deploy applications, microservices, AI agents, and more.

Try a 14-Day Free Trial of Orkes Conductor today.