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; 3 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

• Free and open-source software portal

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]

package org.wikipedia.examples;

import java.io.IOException;

import com.fasterxml.jackson.databind.ObjectMapper;

record Person(int id, String firstName, String lastName) {}

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.printf("Read and parsed Person from JSON: %s%n", q);
   
        Person p = new Person(1, "Roger", "Rabbit");
        System.out.printf("Person object %s as JSON =%n");
        mapper.writeValue(System.out, p);
    }
}