JSONArray att = new JSONArray(YourList);
Blogger
javarevisited.blogspot.com › 2013 › 04 › convert-json-array-to-string-array-list-java-from.html
How to Convert JSON array to String array in Java - GSon example
This Java example uses the GSON library to create a List of String from JSON array and further Java standard library to convert List to an array. Instead of declaring JSON array in Code, which we did here for demonstration purposes, you can also read input from a file, database, or any URL.
Top answer 1 of 2
4
JSONArray att = new JSONArray(YourList);
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3
You can use Gson to convert List<String> to JSON
List<String> listStrings = new ArrayList<String>();
listStrings.add("a");
listStrings.add("b");
Gson objGson = new Gson();
System.out.println(objGson.toJson(listStrings));
Output
["a","b"]
GeeksforGeeks
geeksforgeeks.org › java › how-to-convert-json-array-to-string-array-in-java
How to Convert JSON Array to String Array in Java? - GeeksforGeeks
July 23, 2025 - Given a JSON array, we will discuss how to convert it into a String array in Java. ... Let's start with creating a JSON array in Java. Here, we will use some example data to input into the array, but you can use the data as per your requirements. ... Note that we will import the org.json package in order to use this command. This is later discussed in the code. ... We now add some example data into the array.
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For anyone else who might need this:
String jsonString = "[\"string1\",\"string2\",\"string3\"]";
ObjectMapper mapper = new ObjectMapper();
List<String> strings = mapper.readValue(jsonString, List.class);
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3
As ryzhman said, you are able to cast it to a List, but only of the object (JSONArray in ryzhman's case) extends the ArrayList class. You don't need an entire method for this. You can simply:
List<String> listOfStrings = new JSONArray(data);
Or if you are using IBM's JSONArray (com.ibm.json.java.JSONArray):
List<String> listOfStrings = (JSONArray) jsonObject.get("key");
Top answer 1 of 2
2
Add below dependency to your code
<!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.5</version>
</dependency>
And add your lists in map and then convert it to JSON String.
Map<String, List<String>> map=new HashMap<>();
map.put("First Grade", list1);
map.put("Second Grade", list2);
map.put("Third Grade", list3);
ObjectMapper mapper = new ObjectMapper();
try {
String json = mapper.writeValueAsString(map);
System.out.println(json);
} catch (JsonProcessingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
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If you are going from a ArrayList<String> to JSONArray then you can use GSON library
ArrayList<String> listOfStudentNames = new ArrayList<String>;
listOfStudentNames.add("Tom");
listOfStudentNames.add("Cat");
listOfStudentNames.add("Ed");
...
Gson gson = new Gson();
String data = gson.toJson(listOfStudentNames);
JsonArray jsonArray = new JsonParser().parse(data).getAsJsonArray();
Adambien
adambien.blog › roller › abien › entry › list_string_to_jsonarray_conversion
List<String> to JsonArray Conversion with JSON-P and Java EE 8
January 10, 2019 - List<String> can be converted into JsonArray with: import javax.json.Json; import javax.json.JsonArray; import javax.json.stream.JsonCollectors; import org.junit.jupiter.api.Test; public class StringListToJsonArrayTest { @Test public void conversion() { JsonArray jsonStringArray = ...
Mkyong
mkyong.com › home › java › how to parse json array with jackson
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.List; public class JsonArrayToObjectExample2 { public static void main(String[] args) throws JsonProcessingException { List<Person> list = Arrays.asList( new Person("mkyong", 42), new Person("ah pig", 20) ); ObjectMapper mapper = new ObjectMapper(); String result = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(list); System.out.println(result); } } Output · [ { "name" : "mkyong", "age" : 42 }, { "name" : "ah pig", "age" : 20 } ] This example converts a list of Person objects to a JSON string with the list labeled as "Person": JsonArrayToObjectExample3.java ·
TutorialsPoint
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 - Then, create a list of strings. Then we will create an instance of the Gson class. Next, we will convert the list to a JSON array using the toJsonTree() method of Gson. Finally, we will print the JSON array. Following is the code to convert a list to a JSON array using the Gson library: import ...
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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);
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14
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.
Java Tips
javatips.net › blog › convert-java-collection-list-string-array-into-json
Convert Java Collection / List / String[] Array Into JSON
April 30, 2016 - package net.javatips; import java.util.LinkedList; import java.util.List; import com.google.gson.Gson; import com.google.gson.GsonBuilder; public class Main { public static void main(String[] args) { // Configure gson GsonBuilder gsonBuilder = new GsonBuilder(); Gson gson = gsonBuilder.create(); //Convert List of string into JSON List<String> strList = new LinkedList<String>(); strList.add("How"); strList.add("Are"); strList.add("You"); System.out.println("JSON String List "+gson.toJson(strList)); //Convert List of Object into JSON List<Student> studentList = new LinkedList<Student>(); Student
Baeldung
baeldung.com › home › java › java list › converting a java list to a json array
Converting a Java List to a Json Array | Baeldung
June 18, 2025 - Furthermore, web services and APIs often rely on JSON format to provide public data in a standardized manner. Its versatility makes it compatible with modern programming languages, allowing seamless integration across different platforms and technologies. In this scenario, let’s consider a Java list named “articles” that contains elements as follows: public List<String> list = Arrays.asList("Article 1", "Article 2", "Article 3"); public String expectedJsonArray = "[\"Article 1\",\"Article 2\",\"Article 3\"]";
Adam-bien
adam-bien.com › roller › abien › entry › list_string_to_jsonarray_conversion
List to JsonArray Conversion with JSON-P and Java EE 8
January 10, 2019 - List<String> can be converted into JsonArray with: import javax.json.Json; import javax.json.JsonArray; import javax.json.stream.JsonCollectors; import org.junit.jupiter.api.Test; public class StringListToJsonArrayTest { @Test public void conversion() { JsonArray jsonStringArray = ...
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]
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220
Here you get JSONObject so change this line:
JSONArray jsonArray = new JSONArray(readlocationFeed);
with following:
JSONObject jsnobject = new JSONObject(readlocationFeed);
and after
JSONArray jsonArray = jsnobject.getJSONArray("locations");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject explrObject = jsonArray.getJSONObject(i);
}
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Input String
[
{
"userName": "sandeep",
"age": 30
},
{
"userName": "vivan",
"age": 5
}
]
Simple Way to Convert String to JSON
public class Test
{
public static void main(String[] args) throws JSONException
{
String data = "[{\"userName\": \"sandeep\",\"age\":30},{\"userName\": \"vivan\",\"age\":5}] ";
JSONArray jsonArr = new JSONArray(data);
for (int i = 0; i < jsonArr.length(); i++)
{
JSONObject jsonObj = jsonArr.getJSONObject(i);
System.out.println(jsonObj);
}
}
}
Output
{"userName":"sandeep","age":30}
{"userName":"vivan","age":5}
Top answer 1 of 16
204
ArrayList<String> listdata = new ArrayList<String>();
JSONArray jArray = (JSONArray)jsonObject;
if (jArray != null) {
for (int i=0;i<jArray.length();i++){
listdata.add(jArray.getString(i));
}
}
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85
I've done it using Gson (by Google).
Add the following line to your module's build.gradle:
dependencies {
// ...
// Note that `compile` will be deprecated. Use `implementation` instead.
// See https://stackoverflow.com/a/44409111 for more info
implementation 'com.google.code.gson:gson:2.8.2'
}
JSON string:
private String jsonString = "[\n" +
" {\n" +
" \"id\": \"c200\",\n" +
" \"name\": \"Ravi Tamada\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c201\",\n" +
" \"name\": \"Johnny Depp\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c202\",\n" +
" \"name\": \"Leonardo Dicaprio\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c203\",\n" +
" \"name\": \"John Wayne\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c204\",\n" +
" \"name\": \"Angelina Jolie\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c205\",\n" +
" \"name\": \"Dido\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c206\",\n" +
" \"name\": \"Adele\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c207\",\n" +
" \"name\": \"Hugh Jackman\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c208\",\n" +
" \"name\": \"Will Smith\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c209\",\n" +
" \"name\": \"Clint Eastwood\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c2010\",\n" +
" \"name\": \"Barack Obama\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c2011\",\n" +
" \"name\": \"Kate Winslet\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"female\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" },\n" +
" {\n" +
" \"id\": \"c2012\",\n" +
" \"name\": \"Eminem\",\n" +
" \"email\": \"[email protected]\",\n" +
" \"address\": \"xx-xx-xxxx,x - street, x - country\",\n" +
" \"gender\" : \"male\",\n" +
" \"phone\": {\n" +
" \"mobile\": \"+91 0000000000\",\n" +
" \"home\": \"00 000000\",\n" +
" \"office\": \"00 000000\"\n" +
" }\n" +
" }\n" +
" ]";
ContactModel.java:
public class ContactModel {
public String id;
public String name;
public String email;
}
Code for converting a JSON string to ArrayList<Model>:
Note: You have to import java.lang.reflect.Type;:
// Top of file
import java.lang.reflect.Type;
// ...
private void parseJSON() {
Gson gson = new Gson();
Type type = new TypeToken<List<ContactModel>>(){}.getType();
List<ContactModel> contactList = gson.fromJson(jsonString, type);
for (ContactModel contact : contactList){
Log.i("Contact Details", contact.id + "-" + contact.name + "-" + contact.email);
}
}
Hope this will help you.
Java Guides
javaguides.net › 2019 › 07 › convert-list-to-json-array-using-jackson.html
Convert List to JSON Array Using Jackson
July 21, 2019 - ObjectMapper mapper = new ObjectMapper(); mapper.enable(SerializationFeature.INDENT_OUTPUT); List < String > progLangs = new ArrayList < > (); progLangs.add("C"); progLangs.add("C++"); progLangs.add("Java"); progLangs.add("Java EE"); progLangs.add("Python"); progLangs.add("Scala"); progLangs.add("JavaScript"); // Serialize Object to JSON.
TutorialsPoint
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 - This method is particularly useful when you want to save the JSON output to an external location such as a file system or a network stream. import java.util.*; import java.io.File; import com.fasterxml.jackson.databind.ObjectMapper; public class ListToJSONArrayTest { public static void main(String[] args) { List < String > list = new ArrayList < > (); list.add("JAVA"); list.add("PYTHON"); list.add("SCALA"); list.add(".NET"); list.add("TESTING"); ObjectMapper objectMapper = new ObjectMapper(); try { // Writing the list directly into a JSON file objectMapper.writeValue(new File("list.json"), list); System.out.println("JSON array has been written to list.json file."); } catch (Exception e) { e.printStackTrace(); } } }
Top answer 1 of 2
3
If it is only an array of string you want, you can use the below - List currentGroupIdsList = new ArrayList(Arrays.asList(stringifiedArray.split(",")));Here stringifiedArray is received from the frontend and converted into simple of strings.Hope this helps!
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2
Try .fromJson(arrayOfStrings, JsonArray,class) instead of converting it into JsonObject.class
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 - Created by Guido van Rossum and first released in 1991.'} Language{name='JS', description='JS is a programming language that conforms to the ECMAScript specification. JavaScript is high-level, often just-in-time compiled, and multi-paradigm.'} In this article, we've used Jackson to parse and map the values from a JSON String and file into a Java array and list.
TutorialsPoint
tutorialspoint.com › how-can-we-convert-a-jsonarray-to-string-array-in-java
How can we convert a JSONArray to String Array in Java?
June 6, 2025 - We can convert a JSONArray to String ... "); jsonArray.put("SOUTH AFRICA "); jsonArray.put("ENGLAND "); jsonArray.put("NEWZEALAND "); List < String > list = new ArrayList < String > (); for (int i = 0; i < jsonArray.length(); i++) { list.add(jsonArray.getString(i)); } System.out...