Insert Key value pair into existing JSON in C#

Question

I have a json like below

{
    "name": "Ram",
    "Age": "25",
    "ContactDetails": {
        "MobNo": "1"
    }
}

Please suggest how to add

"Address": {
    "No": "123",
    "Street": "abc"
}

into ContactDetails

Deserialize the JSON string to an object, add the address details and serialize the object. — brz
– brz, Commented Jun 3, 2020 at 10:00
Welcome to StackOverflow! Have a look at learn.microsoft.com/en-us/dotnet/standard/serialization/… and post some sample code if you're stuck — Bernard Vander Beken
– Bernard Vander Beken, Commented Jun 3, 2020 at 10:03

Tomas Chabada · Accepted Answer · 2020-06-03 10:05:47Z

4

This should work (using Newtonsoft.Json)

var json = 
    @"{
        ""name"": ""Ram"",
        ""Age"": ""25"",
        ""ContactDetails"": {
            ""MobNo"": ""1""
        }
    }";

var jObject = JObject.Parse(json);
jObject["ContactDetails"]["Address"] = JObject.Parse(@"{""No"":""123"",""Street"":""abc""}");

var resultAsJsonString = jObject.ToString();

The result is:

{
  "name": "Ram",
  "Age": "25",
  "ContactDetails": {
    "MobNo": "1",
    "Address": {
      "No": "123",
      "Street": "abc"
    }
  }
}

answered Jun 3, 2020 at 10:05

Tomas Chabada

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2 Comments

Roadside Romeozz Over a year ago

one more query ,i need to insert some more values into existing jsonarray {"products":["a","b,"c","etc"]} , please suggest how to do it

Tomas Chabada Over a year ago

Just use JArray: var jObject = JObject.Parse(json); var jArray = jObject["products"] as JArray; jArray.Add("new_product");

Guru Stron · Accepted Answer · 2020-06-03 10:05:54Z

1

One of the options would be use Newtonsoft's Json.NET to parse json into JObject, find needed token, and add property to it:

var jObj = JObject.Parse(jsonString);
var jObjToExtend = (JObject)jObj.SelectToken("$.ContactDetails");
jObjToExtend.Add("Address", JObject.FromObject(new { No = "123", Street = "abc" }));

answered Jun 3, 2020 at 10:05

Guru Stron

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Comments

Gowthaman · Accepted Answer · 2020-06-03 10:04:00Z

0

Just Deserialize the JSON into object, then insert the value that you need to insert to it. Then, Serialize the object into JSON.

Reference: https://learn.microsoft.com/en-us/dotnet/standard/serialization/system-text-json-how-to

answered Jun 3, 2020 at 10:04

Gowthaman

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