How to Customize JSON Serialization of Java 8 LocalDates in Spring Boot?

Customizing JSON Serialization of Java 8 LocalDates in Spring Boot

Problem:

When formatting a Java 8 LocalDateTime within a Spring Boot application, the resulting JSON representation consists of verbose field values instead of the desired ISO date format.

Solution:

Prior to Spring Boot 2.x, additional configuration is required to achieve the desired formatting:

1. Add the following dependency:

   compile("com.fasterxml.jackson.datatype:jackson-datatype-jsr310:2.4.0")

2. Enable timestamp-free date serialization by adding the following to application.properties:

   spring.jackson.serialization.write_dates_as_timestamps=false

3. Include the following annotation on the LocalDateTime property getter:

   @JsonFormat(pattern="yyyy-MM-dd")
   public LocalDateTime getStartDate() {
    return startDate;
   }

Explanation:

Including the jackson-datatype-jsr310 dependency registers a converter for LocalDateTime. Configuring write_dates_as_timestamps to false ensures that the default converter is used, resulting in a serialized date in the ISO format yyyy-MM-dd. The @JsonFormat annotation further customizes the format to the desired string representation.

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