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stackoverflow.com › questions › 14228912 › how-to-convert-list-to-json-in-java

How to convert List to Json in Java - Stack Overflow

1 of 8

153

Use GSON library for that. Here is the sample code

List<String> foo = new ArrayList<String>();
foo.add("A");
foo.add("B");
foo.add("C");

String json = new Gson().toJson(foo );

Here is the maven dependency for Gson

<dependencies>
    <!--  Gson: Java to Json conversion -->
    <dependency>
        <groupId>com.google.code.gson</groupId>
        <artifactId>gson</artifactId>
        <version>2.2.2</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

Or you can directly download jar from here and put it in your class path

http://code.google.com/p/google-gson/downloads/detail?name=gson-1.0.jar&can=4&q=

To send Json to client you can use spring or in simple servlet add this code

response.getWriter().write(json);

2 of 8

You need an external library for this.

JSONArray jsonA = JSONArray.fromObject(mybeanList);
System.out.println(jsonA);

Google GSON is one of such libraries

You can also take a look here for examples on converting Java object collection to JSON string.

stackoverflow.com › questions › 15332733 › how-to-convert-list-data-into-json-in-java

How to convert list data into json in java - Stack Overflow

1 of 8

Using gson it is much simpler. Use following code snippet:

 // create a new Gson instance
 Gson gson = new Gson();
 // convert your list to json
 String jsonCartList = gson.toJson(cartList);
 // print your generated json
 System.out.println("jsonCartList: " + jsonCartList);

Converting back from JSON string to your Java object

 // Converts JSON string into a List of Product object
 Type type = new TypeToken<List<Product>>(){}.getType();
 List<Product> prodList = gson.fromJson(jsonCartList, type);

 // print your List<Product>
 System.out.println("prodList: " + prodList);

2 of 8

public static List<Product> getCartList() {

    JSONObject responseDetailsJson = new JSONObject();
    JSONArray jsonArray = new JSONArray();

    List<Product> cartList = new Vector<Product>(cartMap.keySet().size());
    for(Product p : cartMap.keySet()) {
        cartList.add(p);
        JSONObject formDetailsJson = new JSONObject();
        formDetailsJson.put("id", "1");
        formDetailsJson.put("name", "name1");
       jsonArray.add(formDetailsJson);
    }
    responseDetailsJson.put("forms", jsonArray);//Here you can see the data in json format

    return cartList;

}

you can get the data in the following form

{
    "forms": [
        { "id": "1", "name": "name1" },
        { "id": "2", "name": "name2" } 
    ]
}

tutorialspoint.com › how-can-we-convert-a-list-to-the-json-array-in-java

How can we convert a list to the JSON array in Java?

April 22, 2025 - Following is the code to convert a list to a JSON array using the Jackson library: import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ArrayNode; import java.util.Arrays; import java.util.List; public class ListToJsonArrayJackson { public static void main(String[] args) throws Exception { List<String> list = Arrays.asList("apple", "banana", "cherry"); ObjectMapper mapper = new ObjectMapper(); ArrayNode arrayNode = mapper.valueToTree(list); System.out.println("JSON Array: " + arrayNode.toPrettyString()); } }

stackoverflow.com › questions › 44589381 › how-to-convert-json-string-into-list-of-java-object

How to convert JSON string into List of Java object? - Stack Overflow

mkyong.com › home › java › how to parse json array with jackson

1 of 11

186

You are asking Jackson to parse a StudentList. Tell it to parse a List (of students) instead. Since List is generic you will typically use a TypeReference

List<Student> participantJsonList = mapper.readValue(jsonString, new TypeReference<List<Student>>(){});

2 of 11

For any one who looks for answer yet:

1.Add jackson-databind library to your build tools like Gradle or Maven

2.in your Code:

ObjectMapper mapper = new ObjectMapper();

List<Student> studentList = new ArrayList<>();

studentList = Arrays.asList(mapper.readValue(jsonStringArray, Student[].class));

Mkyong

How to parse JSON Array with Jackson - Mkyong.com

April 23, 2024 - package com.mkyong.json.jackson; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import com.mkyong.json.model.Person; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Map; public class JsonArrayToObjectExample3 { public static void main(String[] args) throws JsonProcessingException { // Create a list of Person objects List<Person> people = Arrays.asList( new Person("mkyong", 42), new Person("ah pig", 20) ); // Wrap the list in a Map with "Person" as the key Map<String, List<Person>> wrapper

Find elsewhere

Google Bing Mojeek

Quora

quora.com › How-do-I-convert-a-list-to-JSON-in-Java

How to convert a list to JSON in Java - Quora

Answer (1 of 8): Just use ObjectMapper from fasterxml library. [code]import com.fasterxml.jackson.databind.ObjectMapper; ObjectMapper mapper = new ObjectMapper(); String jsonString = mapper.writeValueAsString(anyObject); [/code]

Stack Abuse

stackabuse.com › converting-json-array-to-a-java-array-or-list

Convert JSON Array to a Java Array or List with Jackson

September 8, 2020 - We don't always deal with JSON in String format. Oftentimes, the contents come from a File. Thankfully, Jackson makes this task as easy as the last one, we just provide the File to the readValue() method: final ObjectMapper objectMapper = new ObjectMapper(); List<Language> langList = objectMapper.readValue( new File("langs.json"), new TypeReference<List<Language>>(){}); langList.forEach(x -> System.out.println(x.toString())); ... [ { "name": "Java", "description": "Java is a class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible."

tutorialspoint.com › how-to-convert-a-list-to-json-array-using-the-jackson-library-in-java

How to convert a List to JSON array using the Jackson library in Java?

April 29, 2025 - The writeValueAsString() method of the ObjectMapper class serializes a given Java object, such as a List or ArrayList, into JSON-formatted String.

Java Code Geeks

javacodegeeks.com › home › core java

Converting JSON Array to Java List with Gson - Java Code Geeks

April 25, 2024 - Gson, a cornerstone Java library for JSON parsing, stands ready to streamline this conversion process. In this comprehensive guide, we delve into various strategies for seamlessly transforming a JSON array into an equivalent java.util.List object using Gson.

Attacomsian

attacomsian.com › blog › jackson-convert-json-array-to-from-java-list

Convert JSON array to a list using Jackson in Java

November 6, 2022 - In this short tutorial, you'll learn how to use the Jackson library to convert a JSON array string into a list of Java Objects and vice versa.

tutorialspoint.com › convert-a-list-of-objects-to-json-using-the-gson-library-in-java

Convert a list of objects to JSON using the Gson library in Java?

April 22, 2025 - import com.google.gson.Gson; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonParser; import java.util.ArrayList; import java.util.List; public class ListToJsonTree { public static void main(String[] args) { // Create a list of objects List<Person> personList = new ArrayList<>(); personList.add(new Person("Ansh", 23)); personList.add(new Person("Bam", 17)); personList.add(new Person("Ace", 22)); // Create a Gson instance Gson gson = new Gson(); // Convert the list to JSON array JsonElement jsonElement = gson.toJsonTree(personList); JsonArray jsonArray = jsonElement.getAsJsonArray(); // Convert the JSON array to string String jsonString = jsonArray.toString(); // Print the JSON string System.out.println(jsonString); } }

Java Guides

javaguides.net › 2019 › 07 › convert-list-to-json-array-using-jackson.html

Convert List to JSON Array Using Jackson

July 21, 2019 - In this quick article, I will show how to convert a List to JSON array using Jackson. Check out complete Jackson tutorial at Java Jackson JSON Tutorial with Examples. We are using Jackson library to convert Java List to JSON array so let's add below Jackson dependency to your project's classpath ...

tutorialspoint.com › how-can-we-convert-a-json-array-to-a-list-using-jackson-in-java

How can we convert a JSON array to a list using Jackson in Java?\\n

June 5, 2025 - import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.ObjectMapper; import java.util.List; import java.io.IOException; import java.util.ArrayList; public class JsonArrayToList{ public static void main(String[] args) { String jsonArray = "[{"name":"John","age":30},{"name":"Jane","age":25}]"; ObjectMapper objectMapper = new ObjectMapper(); try { List<Person> personList = objectMapper.readValue(jsonArray, new TypeReference<List<Person>>(){}); for (Person person : personList) { System.out.println("Name: " + person.getName() + ", Age: " + person.getAge()); } }

GitHub

gist.github.com › sheharyarn › cba56ff154de2cc62fc5

Simple Java Class to convert Lists/Maps to JSON and vice versa · GitHub

Simple Java Class to convert Lists/Maps to JSON and vice versa - SimpleJSON.java

DevGenius

blog.devgenius.io › how-to-convert-a-java-list-to-a-json-array-a-simple-guide-d3428951a488

How to Convert a Java List to a JSON Array: A Simple Guide | by M Business Solutions | Dev Genius

December 5, 2024 - Fortunately, converting a Java List to a JSON array is straightforward with the help of libraries like Jackson or Gson. In this blog, we’ll walk through different methods for converting a Java List into a JSON array and explore the best practices for handling this conversion.

GeeksforGeeks

geeksforgeeks.org › java › how-to-convert-an-arraylist-of-objects-to-a-json-array-in-java

How to Convert an ArrayList of Objects to a JSON Array in Java? - GeeksforGeeks

July 23, 2025 - Here we are adding the logic of converting an ArrayList of objects to a JSON array of Java in the main class. ... package org.example; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.databind.ObjectMapper; import java.util.ArrayList; import java.util.List; public class Main { public static void main(String[] args) { // Create an ArrayList of objects List<Course> courses = new ArrayList<>(); courses.add( new Course(1, "Java", "25000", "3 Months")); courses.add( new Course(2, "C++", "20000", "3 Months")); // Convert the ArrayList to a JSON array ObjectMapper objectMapper = new ObjectMapper(); try { String jsonArray = objectMapper.writeValueAsString(courses); System.out.println(jsonArray); } catch (JsonProcessingException e) { e.printStackTrace(); } } }

Coderanch

coderanch.com › t › 713115 › java › conversion-array-list-Json-object

conversion of array list to Json object string (Java in General forum at Coderanch)

July 19, 2019 - programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums · this forum made possible by our volunteer staff, including ... ... Hi I have two lists Edge1List and Edge2List which I add to element on them. Edge1List:[o,p] and Edge2List: [p,null]. I convert Edge1List and Edge2List to JsonArray with the name of EdgeJsonArray1 and EdgeJsonArray2 respectively.

stackoverflow.com › questions › 32252606 › json-get-list-of-json-objects

java - JSON: Get list of JSON Objects - Stack Overflow