How Spring Boot auto-configures Jackson?

1. Auto-Configuration:

Spring Boot includes spring-boot-starter-json which provides the ObjectMapper bean.

2. Customizing Jackson:

• Application Properties: Use spring.jackson.* properties (e.g., spring.jackson.date-format).
• Jackson2ObjectMapperBuilderCustomizer: Register a bean of this type for fine-grained control.
• @JsonIgnore / @JsonProperty: Use annotations on your DTOs to control serialization/deserialization.

3. Java 8 Support:

Spring Boot automatically registers the JavaTimeModule to handle LocalDateTime and other Java 8 date types.