Snippet

Renaming JSON Fields with @JsonProperty

@JsonProperty allows you to define a custom name for a field in the generated JSON, decoupling Java names from the API contract.

snippet.java

java

public class UserResponse {
    @JsonProperty("user_name")
    private String username;
}

spring

Breakdown

@JsonProperty("user_name")

Maps the Java field 'username' to 'user_name' in the JSON output.

private String username;

The internal Java field name, which can follow camelCase conventions.