Tutorial by Examples: json

Lets assume you have a class called Person with just name private class Person { public String name; public Person(String name) { this.name = name; } } Code: Gson gson = new Gson(); String json = "{\"name\": \"John\"}"; Person person ...

String json = "{\"name\": \"John\", \"age\":21}"; JsonObject jsonObject = new JsonParser().parse(json).getAsJsonObject(); System.out.println(jsonObject.get("name").getAsString()); //John System.out.println(jsonObject.get("age").getAs...

manifest.json gives information about the extension, such as the most important files and the capabilities that the extension might use. Among the supported manifest fields for extensions, the following three are required. { "manifest_version": 2, "name": "My Exte...

To create a pure JSON table you need to provide a single field with the type JSONB: CREATE TABLE mytable (data JSONB NOT NULL); You should also create a basic index: CREATE INDEX mytable_idx ON mytable USING gin (data jsonb_path_ops); At this point you can insert data in to the table and que...

Taking a complex JSON document in a table: CREATE TABLE mytable (data JSONB NOT NULL); CREATE INDEX mytable_idx ON mytable USING gin (data jsonb_path_ops); INSERT INTO mytable VALUES($$ { "name": "Alice", "emails": [ "[email protected]", ...

The example shows parsing a JSON object using the Gson library from Google. Parsing objects: class Robot { //OPTIONAL - this annotation allows for the key to be different from the field name, and can be omitted if key and field name are same . Also this is good coding practice as it decouple ...

This snippet will grab a JSON formatted resource, decode it and print it in PHP array format. // Fetch $response = wp_remote_get( 'http://www.example.com/resource.json' ); if ( ! is_wp_error( $response ) ) { $headers = wp_remote_retrieve_headers( $response ); if ( isset( $headers[ 'con...

main.rs extern crate serde; extern crate serde_json; // Import this crate to derive the Serialize and Deserialize traits. #[macro_use] extern crate serde_derive; #[derive(Serialize, Deserialize, Debug)] struct Point { x: i32, y: i32, } fn main() { let point = Point { x: ...

SwiftyJSON is a Swift framework built to remove the need for optional chaining in normal JSON serialization. You can download it here: https://github.com/SwiftyJSON/SwiftyJSON Without SwiftyJSON, your code would look like this to find the name of the first book in a JSON object: if let jsonObject...

json.Marshal from the package "encoding/json" encodes a value to JSON. The parameter is the value to encode. The returned values are an array of bytes representing the JSON-encoded input (on success), and an error (on failure). decodedValue := []string{"foo", "bar"} ...

json.Unmarshal from the package "encoding/json" decodes a JSON value into the value pointed by the given variable. The parameters are the value to decode in []bytes and a variable to use as a storage for the de-serialized value. The returned value is an error (on failure). encodedValue :...

Using the apt package manager sudo apt-get update sudo apt-get install nodejs sudo apt-get install npm sudo ln -s /usr/bin/nodejs /usr/bin/node # the node & npm versions in apt are outdated. This is how you can update them: sudo npm install -g npm sudo npm install -g n sudo n stabl...

Standard installation All Node.js binaries, installers, and source files can be downloaded here. You can download just the node.exe runtime or use the Windows installer (.msi), which will also install npm, the recommended package manager for Node.js, and configure paths. Installation by package m...

Let's say we have the following data: >>> data = {"cats": [{"name": "Tubbs", "color": "white"}, {"name": "Pepper", "color": "black"}]} Just dumping this as JSON does not do anything special here: ...

A request for the top 10 most recently active StackOverflow posts using the Stack Exchange API. package main import ( "encoding/json" "fmt" "net/http" "net/url" ) const apiURL = "https://api.stackexchange.com/2.2/posts?" ...

Define your class that will represent your custom error. public class ErrorDto { public int Code { get; set; } public string Message { get; set; } // other fields public override string ToString() { return JsonConvert.SerializeObject(this); } } Then put nex...

NSDictionary *myDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"value1", @"key1", @"value2", @"key2", nil]; NSMutableDictionary *mutableDictionary = [myDictionary mutableCopy]; NSData *data = [NSJSONSerialization dataWithJSONObject:myDiction...

Creating a DB and a Table DROP DATABASE IF EXISTS books_db; CREATE DATABASE books_db WITH ENCODING='UTF8' TEMPLATE template0; DROP TABLE IF EXISTS books; CREATE TABLE books ( id SERIAL PRIMARY KEY, client TEXT NOT NULL, data JSONb NOT NULL ); Populating the DB INSERT INTO books...

You can broadcast more complex messages by serializing the payload before you publish it: // definition of a message public class ChatMessage { public Guid Id { get; set; } public string User { get; set; } public string Text { get; set; } } // grab an instance of an ISubscriber...

{ "some_string": null, "ather_string": "something" } If we will use this way: JSONObject json = new JSONObject(jsonStr); String someString = json.optString("some_string"); We will have output: someString = "null"; So we need to...