Because the JSON API uses SnakeCase For more information, see Translation: WebAPI Design Best Practices (https://qiita.com/mserizawa/items/b833e407d89abd21ee72).
If it is SpringBoot 2.0.5.RELEASE, it should be described in application.yml.
application.yml
spring:
jackson:
property-naming-strategy: SNAKE_CASE
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