How to Convert the Object to a JSON String in C#

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Minahil Noor Feb 02, 2024
Csharp Csharp JSON
  1. C# Program to Convert an Object to JSON String Using JavaScriptSerializer().Serialize() Method
  2. C# Program to Convert an Object to a JSON String Using JsonConvert.SerializeObject() Method
  3. C# Program to Convert an Object to JSON String Using JObject.FromObject() Method
How to Convert the Object to a JSON String in C#

In C#, information can be converted into a useful format called JavaScript Object Notation (JSON). It is converted because the JSON format is simpler to understand and easier to process.

This article focuses on the methods to convert a C# object into a JSON string.

C# Program to Convert an Object to JSON String Using JavaScriptSerializer().Serialize() Method

To implement this method, we first create a custom class object that contains the information. This object is then passed as a parameter to JavaScriptSerializer().Serialize() method. As a result, we get our information converted to a JSON string.

The correct syntax to use this method is as follows:

var jsonStringName = new JavaScriptSerializer();
var jsonStringResult = jsonStringName.Serialize(ObjectName);

Example Code:

using System;
using System.Web.Script.Serialization;

class Conversion {
  static void Main() {
    // Creating Custom Class Object
    var Object =
        new MyInformation { firstName = "Olivia", lastName = "Mason",
                            dateOfBirth = new DateOfBirth { year = 1999, month = 06, day = 19 } };
    // Creating a JavaScriptSerializer Object
    var jsonString = new JavaScriptSerializer();
    // Use of Serialize() method
    var jsonStringResult = jsonString.Serialize(Object);
    Console.WriteLine(jsonStringResult);
  }
}
// Custom Classes
public class MyInformation {
  public string firstName;
  public string lastName;
  public DateOfBirth dateOfBirth;
}

public class DateOfBirth {
  public int year;
  public int month;
  public int day;
}

Output:

{
    "firstName":"Olivia",
    "lastName":"Mason",
    "dateOfBirth":
    {
        "year":"1999",
        "month":"06",
        "day":"19"
    }
}

C# Program to Convert an Object to a JSON String Using JsonConvert.SerializeObject() Method

JsonConvert.SerializeObject() is a JsonConvert class method. It is used to convert a C# object into a JSON string. The object is passed as a parameter to this method.

The correct syntax to use this method is as follows:

JsonConvert.SerializeObject(ObjectName);

Example Code:

using System;
using Newtonsoft.Json;

namespace JSONConversion {
  public class Conversion {
    public static void Main(string[] args) {
      // Creating custom class object
      Name NewName = new Name { FirstName = "Olivia", LastName = "Mason" };
      // Use of JsonConvert.SerializeObject()
      string jsonString = JsonConvert.SerializeObject(NewName);
      Console.WriteLine(jsonString);
    }
    // Creating custom class
    public class Name {
      public string FirstName;
      public string LastName;
    }
  }
}

Output:

{
    'FirstName': 'Olivia',
    'LastName': 'Mason'
}

C# Program to Convert an Object to JSON String Using JObject.FromObject() Method

This method can be implemented in the earlier versions of .Net. It easily converts a C# object to a JSON string. The object name is passed as a parameter to this method.

The correct syntax to use this method is as follows:

JObject.FromObject(ObjectName);

Example Code:

using System;
using Newtonsoft.Json.Linq;

namespace JSONConversion {
  public class Conversion {
    public static void Main(string[] args) {
      name Name = new name { firstname = "Olivia", lastname = "Mason" };
      // Use of the method
      var json = JObject.FromObject(Name);
      Console.WriteLine(json);
    }
    public class name {
      public string firstname;
      public string lastname;
    }
  }
}

Output:

{
  "firstname": "Olivia",
  "lastname": "Mason"
}

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