What is JSON?
JSON (JavaScript Object Notation) is THE standard design for human-readable data interchange. It is a light-weight, human-readable format for storing and transporting data. Since JSON works with a tree structure, it looks like
JSON is mainly used when data is sent from a server to a web page.
How to create JSON string in C#
Create your new console project from Visual Studio.
Click File, New Project, Console Application.
Once the editor is opened, go to “Project”.
Click on “Manage NuGet Packages”.
Search “Newtonsoft.JSON” on Nuget Package Manager in the browse window and install it.
You can also install
Newtonsoft.JSON
from the terminal using this command:dotnet add package Newtonsoft.Json
- Add the relevant libraries as part of the code. The programming language used is C#:
using System;using System.Collections.Generic;using Newtonsoft.Json;
- Create a class. For example, let’s create the class
studentInfo
that stores thename
,Roll
(as in roll number), and the list of courses each student is studying during the semester. We will output this information as a JSON string:
class studentInfo{ public int Roll {get; set;} public string name {get; set;} public List<string> courses {get; set;}}
- Define a new instance of class
studentInfo
in the main function. In this example, I have named itstudent1
. Add relevant values to store in this class attribute:
studentInfo student1 = new studentInfo() { Roll = 110, name = "Alex", courses = new List<string>() { "Math230", "Calculus1", "CS100", "ML" } };
- Convert the object to a JSON string by serializing the object. Serialization will return a string. Finally, output the string.
string stringjson = JsonConvert.SerializeObject(student1);Console.WriteLine(stringjson);
Code
// necessary libraries to be used
using System;
using System.Collections.Generic;
using Newtonsoft.Json;
namespace JsonParser
{
// Define a class to store values to be converted to JSON
class studentInfo
{
// Make sure all class attributes have relevant getter setter.
// Roll Number
public int Roll {get; set;}
// Name of the student
public string name {get; set;}
// The List of courses studying
public List<string> courses {get; set;}
}
class HelloWorld
{
// Main function
static void Main()
{
// Creating a new instance of class studentInfo
studentInfo student1 = new studentInfo()
{
// Roll number
Roll = 110,
// Name
name = "Alex",
//list of courses
courses = new List<string>()
{
"Math230",
"Calculus1",
"CS100",
"ML"
}
};
Console.WriteLine("JSON converted string: ");
// convert to Json string by seralization of the instance of class.
string stringjson = JsonConvert.SerializeObject(student1);
Console.WriteLine(stringjson);
}
}
}
Sample output
JSON converted string:{"Roll":110,"name":"Alex","courses":["Math230","Calculus1","CS100","ML"]}
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