![]() ![]() ObjectMapper is the most commonly used part of the Jackson library as it’s the easiest way to convert between POJOs and JSON. Simple Data Binding which converts JSON to and from Java Maps, Lists, Strings, Numbers, Booleans, and null objects.įull Data Binding which Converts JSON to and from any Java class. It allows us to do conversion between POJOs and JSON documents using property accessors or using annotations. ![]() It is the most flexible approach as it allows us to traverse the node tree when the JSON document doesn’t map well to a POJO. An ObjectMapper is responsible for building a tree of JsonNode nodes. The Tree Model creates an in-memory tree representation of the JSON document. The API provides a JsonParser that reads JSON into POJOs and a JsonGenerator that writes POJOs into JSON. It reads and writes JSON content as discrete events. It’s the fastest approach of the three and the one with the least overhead. With those, Jackson offers us three ways to handle JSON-POJO conversion: Streaming API Under the hood, Jackson has three core packages Streaming, Databind, and Annotations. Moreover, it’s an open-source project that is actively developed and maintained by a wide community. Jackson is preferred by many people because of its maturity (13 years old) and its excellent integration with popular frameworks, such as Spring. It also supports many other data formats such as CSV, YML, and XML. Jackson is mainly known as a library that converts JSON strings and Plain Old Java Objects (POJOs). ![]()
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