When using Spring MVC for REST, how do you enable Jackson to pretty-print rendered JSON?

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If you are using Spring Boot 1.2 or later the simple solution is to add

spring.jackson.serialization.INDENT_OUTPUT=true

to the application.properties file. This assumes that you are using Jackson for serialization.

If you are using an earlier version of Spring Boot then you can add

http.mappers.json-pretty-print=true

This solution still works with Spring Boot 1.2 but it is deprecated and will eventually be removed entirely. You will get a deprecation warning in the log at startup time.

(tested using spring-boot-starter-web)

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