Jackson (API)

In computing, Jackson is a high-performance JSON processor for Java. Its developers extol the combination of fast, correct, lightweight, and ergonomic attributes of the library.^[1][2]

Jackson
Stable release	2.19.2 / July 18, 2025; 2 months ago (2025-07-18)
Repository	github.com/FasterXML/jackson.git
Operating system	Cross-platform
Type	API for JSON
License	Apache License 2.0
Website	github.com/FasterXML/jackson

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Implementation

Jackson provides multiple approaches to working with JSON, including using binding annotations on POJO classes for simple use cases.^[3][1]

Usage example

Sample code for reading and writing with POJOs may look like the following:^[1]

public class ReadWriteJackson {
  public static void main(String[] args) throws IOException {
    ObjectMapper mapper = new ObjectMapper();
   
    String jsonInput = "{\"id\":0,\"firstName\":\"Robin\",\"lastName\":\"Wilson\"}";
    Person q = mapper.readValue(jsonInput, Person.class);
    System.out.println("Read and parsed Person from JSON: " + q);
   
    Person p = new Person("Roger", "Rabbit");
    System.out.print("Person object " + p + " as JSON = ");
    mapper.writeValue(System.out, p);
  }
}