Mastering JSON in Java using Jackson

Tags: java

Written by: Tushar Sharma

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JSON(Javascript Object Notation) is the universal language for data exchange in modern applications, particularly when working with REST APIs. In Java, Jackson library is often used for JSON processing.

Jackson Core Components

ObjectMapper: Bridge between JSON and Java objects
JsonNode: Tree model for dynamic JSON navigation
ObjectNode/ArrayNode: Mutable JSON node builder

Json Parsing fundamentals

Parse JSON String

Building JSON dynamically

Create new JSON object

Java Objects <-> JSON Conversion

Deserialization (JSON -> Object)

Serialization (Object -> JSON)

Common Issues

Date Handling

Don't forget to register JavaTimeModule

Extra Getters

If the getter have no corresponding field, then deserialization would fail

Use Ignore Unknown Properties

Or use Read-Only Properties