How to Properly Format LocalDateTime JSON in Spring Boot?

Formatting JSON LocalDateTime in Spring Boot

In Spring Boot applications, formatting Java 8 LocalDateTime values as JSON can present challenges. While converting regular dates is straightforward, LocalDateTime values often result in an undesirable format:

"startDate" : {
    "year" : 2010,
    "month" : "JANUARY",
    "dayOfMonth" : 1,
    "dayOfWeek" : "FRIDAY",
    "dayOfYear" : 1,
    "monthValue" : 1,
    "hour" : 2,
    "minute" : 2,
    "second" : 0,
    "nano" : 0,
    "chronology" : {
      "id" : "ISO",
      "calendarType" : "iso8601"
    }
  }

To address this issue, follow these steps:

1. Add the JSR-310 Converter Dependency:

   <dependency>
       <groupId>com.fasterxml.jackson.datatype</groupId>
       <artifactId>jackson-datatype-jsr310</artifactId>
   </dependency>

   This dependency provides a converter that Spring will automatically register.

2. Configure Application Properties:

   spring.jackson.serialization.write_dates_as_timestamps=false

   This setting ensures the usage of a proper converter, resulting in the following format:

   "startDate": "2016-03-16T13:56:39.492"

3. Customize Date Format (Optional):

   Use the @JsonFormat annotation to override the default format:

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

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