org.json.JSONArray may be what you want.
String message;
JSONObject json = new JSONObject();
json.put("name", "student");
JSONArray array = new JSONArray();
JSONObject item = new JSONObject();
item.put("information", "test");
item.put("id", 3);
item.put("name", "course1");
array.put(item);
json.put("course", array);
message = json.toString();
// message
// {"course":[{"id":3,"information":"test","name":"course1"}],"name":"student"}
Top answer 1 of 6
266
org.json.JSONArray may be what you want.
String message;
JSONObject json = new JSONObject();
json.put("name", "student");
JSONArray array = new JSONArray();
JSONObject item = new JSONObject();
item.put("information", "test");
item.put("id", 3);
item.put("name", "course1");
array.put(item);
json.put("course", array);
message = json.toString();
// message
// {"course":[{"id":3,"information":"test","name":"course1"}],"name":"student"}
2 of 6
13
In contrast to what the accepted answer proposes, the documentation says that for JSONArray() you must use put(value) no add(value).
https://developer.android.com/reference/org/json/JSONArray.html#put(java.lang.Object)
(Android API 19-27. Kotlin 1.2.50)
Baeldung
baeldung.com › home › json › introduction to json-java (org.json)
Introduction to JSON-Java | Baeldung
June 20, 2025 - In the example below, the package uses the getters from the DemoBean class and creates an appropriate JSONObject for the same. To get a JSONObject from a Java Object, we’ll have to use a class that is a valid Java Bean:
Generate example JSON from Java classes
Jackson? It is the built in for SpringBoot. https://www.baeldung.com/jackson-object-mapper-tutorial More on reddit.com
9
5
February 8, 2023Creating JSON object in JAVA client to post into REST API
Hi, I am writing a java client that makes REST calls to Camunda. I understand the following code should allow me to create JSON string that is correctly formatted so that it can be posted into the API ( as per the variable format we see here: https://docs.camunda.org/manual/7.4/reference/r... More on forum.camunda.io
0
0
April 22, 2016can anyone tell me how to construct a custom json request in java
It's better that you not use a string and have variables in them. The best way to do it is have a class which resembles the structure of your json and then create an object of that class by setting the values you were setting for the json. Ex. class JsonRequest { String jsonrpc; String method; Map params; Integer id; } This resembles the structure of your request ( I have kept params as a map so you can add more params ) And after creating a class , you can instantiate an object with the required values. Ex. Map params = new HashMap<>(); params.put("account", 1920); JsonRequest jr = new JsonRequest("2.0", "getAccount", params, 123) Assuming that you have an all arguments constructor After setting the values you can use libraries like Gson or ObjectMapper to convert this object to json string; You can just google this step. More on reddit.com
3
1
April 22, 2021Is it common that it's so difficult to handle JSON payloads in Java?
No? It's rather easy to work with JSON in Java, but Java remains a statically typed language. If you want to manipulate them dynamically, just deserialize them to a JsonTree-like object and work your way through that. Or maybe even a HashMap. More on reddit.com
22
7
December 20, 2019Videos
18:29
JSON in Java - Writing to Files - YouTube
14:44
Create Complex Json in Java | Json Object | Json Array In Java ...
17:21
34. Create JSON Object payload using Java Map - YouTube
05:47
Create Java classes from JSON Object - YouTube
How to Write Data to Json File using JAVA Code
13:31
48. How To Create JSON Object Payload Using POJO? - YouTube
CodeSignal
codesignal.com › learn › courses › handling-json-files-with-java › lessons › creating-and-writing-json-data-with-java-using-jackson
Creating and Writing JSON Data with Java
In previous lessons, you learned how to parse JSON files in Java and explore JSON's hierarchical structure. Now, we'll focus on constructing JSON objects and writing them to files. In this lesson, you'll discover how to create JSON objects using Java classes and serialize them using the Jackson library's ObjectMapper class.
Oracle
docs.oracle.com › javaee › 7 › api › javax › json › JsonObjectBuilder.html
JsonObjectBuilder (Java(TM) EE 7 Specification APIs)
A builder for creating JsonObject models from scratch. This interface initializes an empty JSON object model and provides methods to add name/value pairs to the object model and to return the resulting object.
Medium
medium.com › @benpourian › how-to-create-a-java-object-from-a-json-object-c47c08b030c5
How to create a Java Object from a JSON object | by Benjamin Pourian | Medium
October 25, 2018 - This will be a very brief guide to creating a Java object from a JSON object using the popular gson` google library. I will first demonstrate a simple JSON → POJO example then follow that with another example where I will be using annotations provided by gson to instantiate a new object by capturing the relevant serialized name.
W3Docs
w3docs.com › java
How to create JSON Object using String?
You can also use the org.json library to create a JSON object from scratch, by adding key-value pairs to the object using the put method: JSONObject jsonObject = new JSONObject(); jsonObject.put("key1", "value1"); jsonObject.put("key2", "value2");
GeeksforGeeks
geeksforgeeks.org › java › how-to-generate-json-with-jsongenerator-in-java
How to Generate JSON with JsonGenerator in Java? - GeeksforGeeks
June 8, 2022 - The JsonObjectBuilder interface acts as a builder for creating JsonObject models from scratch. This interface initializes an empty JSON object model and provides methods to add name/value pairs to the object model and to return the resulting object.
TutorialsPoint
tutorialspoint.com › json › json_java_example.htm
JSON with Java
Following is another example that shows a JSON object streaming using Java JSONObject − · import org.json.simple.JSONObject; class JsonEncodeDemo { public static void main(String[] args) { JSONObject obj = new JSONObject(); obj.put("name","foo"); obj.put("num",new Integer(100)); obj.put("balance",new Double(1000.21)); obj.put("is_vip",new Boolean(true)); StringWriter out = new StringWriter(); obj.writeJSONString(out); String jsonText = out.toString(); System.out.print(jsonText); } }
GeeksforGeeks
geeksforgeeks.org › java › working-with-json-data-in-java
Working with JSON Data in Java - GeeksforGeeks
December 23, 2025 - JSON encoding means converting Java data into JSON format. Example: Create and Print JSON Object.
Stleary
stleary.github.io › JSON-java › org › json › JSONObject.html
JSONObject
If the object is null, return the NULL object. If it is an array or collection, wrap it in a JSONArray. If it is a map, wrap it in a JSONObject. If it is a standard property (Double, String, et al) then it is already wrapped. Otherwise, if it comes from one of the java packages, turn it into ...
Reddit
reddit.com › r/learnjava › generate example json from java classes
r/learnjava on Reddit: Generate example JSON from Java classes
February 8, 2023 -
TL;DR: Looking for a tool that can generate example-json from POJOs
We use an event-driven architecture and dispatch the event-payloads as json-strings. We also have to document the structure of these payloads and currently we do this by typing json-examples manually.
The payloads are basically just POJOs with a constructor, getters and setters.
I'm looking for a tool to streamline the documentation-process! Is there a software that can generate example json from Java classes?
I'm really thankful for any recommendation!
Oracle
docs.oracle.com › javaee › 7 › api › javax › json › JsonObject.html
JsonObject (Java(TM) EE 7 Specification APIs)
javax.json · All Superinterfaces: ... It also provides unmodifiable map view to the JSON object name/value mappings. A JsonObject instance can be created from an input source using JsonReader.readObject()....
Camunda
forum.camunda.io › camunda 7 topics › discussion & questions
Creating JSON object in JAVA client to post into REST API - Discussion & Questions - Camunda Forum
April 22, 2016 - Hi, I am writing a java client that makes REST calls to Camunda. I understand the following code should allow me to create JSON string that is correctly formatted so that it can be posted into the API ( as per the variable format we see here: https://docs.camunda.org/manual/7.4/reference/rest/process-definition/post-start-process-instance/#request ). My example code is this package sandbox.camunda; import org.camunda.bpm.engine.variable.Variables; import org.camunda.bpm.engine.variable.valu...
Javatpoint
javatpoint.com › java-json-example
Java JSON Example
Java JSON example for beginners and professionals with examples of JSON with java, install json.simple, java json encode, java json encode using map, java json array encode, java json array encode using List, java json decode. Learn Java JSON example with array, object, schema, encode, decode, ...
Attacomsian
attacomsian.com › blog › jackson-create-json-object
How to create a JSON Object using Jackson
October 14, 2022 - A short tutorial to learn how to create a JSON object using Jackson API.
JavaMadeSoEasy
javamadesoeasy.com › 2018 › 09 › create-json-using-javaxjsonjsonobjectbu.html
JavaMadeSoEasy.com (JMSE): Create JSON using javax.json.JsonObjectBuilder - Write int, String and Array in java
If you are beginner don't worry learn how to Create new Maven project - In 2 minutes · We can use Jackson api for for processing JSON in java. Jackson JSON examples · Convert JSON string to java Object - using Jackson · Convert java object to JSON string and pretty print Json in java - using Jackson ·
TutorialsPoint
tutorialspoint.com › how-to-write-create-a-json-file-using-java
How to Write/create a JSON file using Java?
May 7, 2025 - Insert the required key-value pairs using the put() method of the JSONObject class. ... FileWriter file = new FileWriter("E:/output.json"); file.write(jsonObject.toJSONString()); file.close(); Below is an example of a Java program that creates a JSON object and writes it into a file named ...
DigitalOcean
digitalocean.com › community › tutorials › java-json-example
Java JSON Example | DigitalOcean
August 4, 2022 - The factory classes provide all the various ways to create these objects. javax.json.JsonObject: JsonObject represents an immutable JSON object value. Let’s look into the usage of Java JSON API with simple program, we have a JSON object stored in a file employee.txt as;
Reddit
reddit.com › r/javahelp › can anyone tell me how to construct a custom json request in java
r/javahelp on Reddit: can anyone tell me how to construct a custom json request in java
April 22, 2021 -
below is a copy of the string i want to edit and send but when i try to use a varible in the string i get a error ( string litral ) i think its because i not formating the escape char correcly but im lost can any show me how to use escape chars with in a string
httpPostRequests testing = new httpPostRequests("{\"jsonrpc\":\"2.0\",\"method\":\"getaccount\",\"params\":{\""\account\":1920},\"id\":123}","http://localhost:4003");
Top answer 1 of 3
2
It's better that you not use a string and have variables in them. The best way to do it is have a class which resembles the structure of your json and then create an object of that class by setting the values you were setting for the json. Ex. class JsonRequest { String jsonrpc; String method; Map params; Integer id; } This resembles the structure of your request ( I have kept params as a map so you can add more params ) And after creating a class , you can instantiate an object with the required values. Ex. Map params = new HashMap<>(); params.put("account", 1920); JsonRequest jr = new JsonRequest("2.0", "getAccount", params, 123) Assuming that you have an all arguments constructor After setting the values you can use libraries like Gson or ObjectMapper to convert this object to json string; You can just google this step.
2 of 3
1
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Java Guides
javaguides.net › 2019 › 07 › java-create-json-example-json.html
Java Create JSON Example - JSON Processing API
July 16, 2019 - In this post, we will learn how to create a JSON object from Java object using JSON-P library. Check out complete JSON-P tutorial at Java JSON Processing Tutorial.