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I want to convert JSON with key & value

From this JSON:

To this JSON

Both Json I need to convert object like List of keyvalue pair <string, string="">
Ex: Key = Name
Value = Vasanthakumar

What I have tried:

I tried using Json converter but No luck to get success.
Updated 7-Aug-21 5:44am
Richard MacCutchan 4-Aug-21 9:23am    
You first need to deserialize the source text, add the relevant fields to the classes and then serialize the result.
vasanthkumarmk 4-Aug-21 10:59am    
When I deseralize using List of keyvalue pair, the second json array looks correct order [0] => key = Name; Value=Vasanthakumar etc....
But the first json array looks [0] => [0][1] => key = key; Value = Name;
key = value; value = Vasanthakumar etc...
Richard MacCutchan 4-Aug-21 11:39am    
Sorry, we are not here to write people's code. MSDN contains plenty of code samples for serializing and deserializing JSON.

1 solution

Here is a sample program.

For clarity, I just manually created the source data with a class initialization.

The OP will mostly likely need to create the source data class instance with JsonConvert.DeserializeObject<sourceroot>(sourceJsonData) statement;

Here is a link to a tool that will create a C# class based on Json structures. It can be very helpful.

Code was built in Visual Studio 2019, and is a .Net 4.8 framework Console application.

using Newtonsoft.Json;
using System.Collections.Generic;

namespace CodeProject_JSonConverter
    class Program
        static void Main(string[] args)
            // This code block is to create sample data only. Use the JsonConvert.DeserializeObject<Root>(myJsonResponse) 
            // to initialize the sourceData class. 

            var sourceData = new SourceRoot
                error = false,
                parameters = new List<SourceParameter>
                    new SourceParameter {Name = "Vasanthakumar", FirstName = "Vasanth", LastName = "Kumar", Phone = "1234567890"}

            // This is the block of code that will convert the deserialized source class to the target class
            var targetData = new TargetRoot();
            targetData.parameters = new List<TargetParameter>();

            targetData.error = sourceData.error;
            foreach (var item in sourceData.parameters)
                targetData.parameters.Add(new TargetParameter { key = nameof(SourceParameter.Name), value = item.Name });
                targetData.parameters.Add(new TargetParameter { key = nameof(SourceParameter.FirstName), value = item.FirstName });
                targetData.parameters.Add(new TargetParameter { key = nameof(SourceParameter.LastName), value = item.LastName });
                targetData.parameters.Add(new TargetParameter { key = nameof(SourceParameter.Phone), value = item.Phone });

            // Serializes the target class into the new Json format
            var targetJson = JsonConvert.SerializeObject(targetData);

    public class SourceRoot
        public bool error { get; set; }
        public List<SourceParameter> parameters { get; set; }

    public class SourceParameter
        public string Name { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string Phone { get; set; }
    public class TargetRoot
        public bool error { get; set; }
        public List<TargetParameter> parameters { get; set; }

    public class TargetParameter
        public string key { get; set; }
        public string value { get; set; }

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