How to Properly Serialize Java 8 LocalDateTime to JSON in Spring Boot?

Converting Java 8 LocalDateTime to JSON in Spring Boot

In Spring Boot, formatting Java 8 LocalDateTime objects for JSON output can pose challenges. While traditional date formatting works as expected, LocalDateTime presents a unique formatting issue.

One common problem is that LocalDateTime fields are converted to a detailed structure with attributes like "year," "month," and so on, instead of a simple string representation. To address this issue, additional configuration is required.

To resolve this, follow these steps:

1. Add the Jackson Dependency:

   • Include the following dependency in your project:

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

2. Configure Spring:

   • Add the following line to your application.properties file:

     spring.jackson.serialization.write_dates_as_timestamps=false

   • This will ensure that a proper converter is used to serialize dates as strings.

Now, Spring Boot will automatically register a LocalDateTime converter. However, if you want to customize the date format, you can use the following annotations:

• @JsonFormat: Use this annotation to specify the desired date format.
• @DateTimeFormat: Use this annotation to specify the ISO date format.

Note: In Spring Boot 2.x, the configuration steps described above are no longer required, as Spring now natively handles LocalDateTime conversion.

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