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JSON Articles
Page 9 of 16
Convert JSON to another JSON format with recursion JavaScript
Suppose, we have the following JSON object −const obj = { "context": { "device": { "localeCountryCode": "AX", "datetime": "3047-09-29T07:09:52.498Z" }, "currentLocation": { "country": "KM", "lon": -78789486, } } };We are required to write a JavaScript recursive function that initially takes in one such array.The function should split the above object into a "label" - "children" format.Therefore, the output for the above object should look like −const output = { ...
Read MoreDeep Search JSON Object JavaScript
Suppose we have the following nested JSON object −const obj = { id: 1, title: 'hello world', child: { id: null, title: 'foobar', child: { id: null, title: 'i should be in results array ' } }, foo: { id: null, title: 'i should be in results array too!' }, deep: [ { id: null, ...
Read MoreHow to turn a JSON object into a JavaScript array in JavaScript ?
Suppose, we have this JSON object where index keys are mapped to some literals −const obj = { "0": "Rakesh", "1": "Dinesh", "2": "Mohit", "3": "Rajan", "4": "Ashish" };We are required to write a JavaScript function that takes in one such object and uses the object values to construct an array of literals.ExampleThe code for this will be −const obj = { "0": "Rakesh", "1": "Dinesh", "2": "Mohit", "3": "Rajan", "4": "Ashish" }; const objectToArray = (obj) => { const res = []; const keys = Object.keys(obj); keys.forEach(el => { res[+el] = obj[el]; }); return res; }; console.log(objectToArray(obj));OutputAnd the output in the console will be −[ 'Rakesh', 'Dinesh', 'Mohit', 'Rajan', 'Ashish' ]
Read MoreFinding the smallest value in a JSON object in JavaScript
We are required to write a JavaScript function that takes in a JSON object as one and only argument.The JSON object has string keys mapped to some numbers. Our function should traverse through the object, find and return the smallest value from the object.ExampleThe code for this will be −const obj = { "a": 4, "b": 2, "c": 5, "d": 1, "e": 3 }; const findSmallestValue = obj => { const smallest = Object.keys(obj).reduce((acc, val) => { return Math.min(acc, obj[val]); }, Infinity); return smallest; } console.log(findSmallestValue(obj));OutputAnd the output in the console will be −1
Read MoreRead by key and parse as JSON in JavaScript
Suppose, we have a JSON array like this −const arr = [{ "data": [ { "W": 1, "A1": "123" }, { "W": 1, "A1": "456" }, { "W": 2, "A1": "4578" }, { "W": 2, "A1": "2423" }, { "W": 2, "A1": "2432" }, { "W": 2, "A1": "24324" } ] }];We are required to write a JavaScript function that takes in one such array and converts it to the following JSON array −[ { "1": ...
Read MoreWhat to use @SerializedName annotation using Gson in Java?
The @SerializedName annotation can be used to serialize a field with a different name instead of an actual field name. We can provide the expected serialized name as an annotation attribute, Gson can make sure to read or write a field with the provided name.Syntax@Retention(value=RUNTIME) @Target(value={FIELD, METHOD}) public @interface SerializedNameExampleimport com.google.gson.*; import com.google.gson.annotations.*; public class SerializedNameTest { public static void main(String args[]) { Gson gson = new GsonBuilder().setPrettyPrinting().create(); Person person = new Person(115, "Raja Ramesh", "Hyderabad"); String jsonStr = gson.toJson(person); System.out.println(jsonStr); } } // Person class class ...
Read MoreHow to implement custom JsonAdapter using Gson in Java?
The @JsonAdapter annotation can be used at field or class level to specify the Gson. The TypeAdapter class can be used to convert Java objects to and from JSON. By default, Gson library converts application classes to JSON by using built-in type adapters but we can override it by providing custom type adapters.Syntax@Retention(value=RUNTIME) @Target(value={TYPE, FIELD}) public @interface JsonAdapterExampleimport java.io.IOException; import com.google.gson.Gson; import com.google.gson.TypeAdapter; import com.google.gson.annotations.JsonAdapter; import com.google.gson.stream.JsonReader; import com.google.gson.stream.JsonWriter; public class JsonAdapterTest { public static void main(String[] args) { Gson gson = new Gson(); System.out.println(gson.toJson(new Customer())); } } // Customer class class Customer { ...
Read MoreHow to convert JsonNode to ArrayNode using Jackson API in Java?
A JsonNode is a base class for all JSON nodes that forms the JSON Tree Model whereas ArrayNode is a node class that represents an array mapped from JSON content. We can convert or translate JsonNode to ArrayNode by typecasting the ArrayNode to retrieve the values using the readTree() method of ObjectMapper class and get() method for accessing the value of a specified element of an array node.Syntaxpublic JsonNode readTree(String content) throws IOException, com.fasterxml.jackson.core.JsonProcessingExceptionExampleimport com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.node.ArrayNode; import com.fasterxml.jackson.core.JsonProcessingException; public class JSonNodeToArrayNodeTest { public static void main(String args[]) throws JsonProcessingException { String jsonStr = "{\"Technologies\" : [\"Java\", ...
Read MoreHow to search a value inside a JSON file using Jackson in Java?
The com.fasterxml.jackson.databind.node.ObjectNode class can be used to map the JSON object structure in Json content. We can search for a particular value inside the JSON file using the get() method of ObjectNode class, this method used for accessing the value of a specified field of an object node.Syntaxpublic JsonNode get(String fieldName)Exampleimport com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.node.ObjectNode; public class ObjectNodeTest { public static void main(String args[]) throws Exception { String jsonString = "{\"Id\":101, \"name\":\"Raja Ramesh\", \"address\":\"Madhapur\"}"; ObjectMapper mapper = new ObjectMapper(); ObjectNode node = mapper.readValue(jsonString, ObjectNode.class); if(node.has("name")) { ...
Read MoreHow to implement custom deserializer using @JsonDeserialize annotation in Java?\\n
The @JsonDeserialize annotation is used to declare custom deserializer while deserializing JSON to Java object. We can implement a custom deserializer by extending the StdDeserializer class with a generic type Employee and need to override the deserialize() method of StdDeserializer class.Syntax@Target(value={ANNOTATION_TYPE, METHOD, FIELD, TYPE, PARAMETER}) @Retention(value=RUNTIME) public @interface JsonDeserializeIn the below program, we can implement a custom deserializer using @JsonDeserialize annotationExampleimport java.io.*; import com.fasterxml.jackson.core.*; import com.fasterxml.jackson.databind.*; import com.fasterxml.jackson.databind.annotation.*; import com.fasterxml.jackson.databind.deser.std.*; public class JsonDeSerializeAnnotationTest { public static void main (String[] args) throws JsonProcessingException, IOException { Employee emp = new Employee(115, "Adithya"); ObjectMapper mapper = new ObjectMapper(); ...
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