add new field in every json object in a array javascript

I am working on a react app where I am fetching a JSON response from a route which is basically a list of JSON objects.

Now I want to add a field in every JSON object according to another field in that JSON object:

Here’s my response:

{
  messages: [
    {
      msgId: "2021082111010755885",
      interfaceId: 5,
      status: "QUEUED",
      createdAt: "2021-08-21 11:01:07.89554",
      modifiedAt: "2021-08-21 11:01:07.89554",
      count: 0,
    },
    {
      msgId: "2021082012204615964",
      interfaceId: 5,
      status: "QUEUED",
      createdAt: "2021-08-20 12:20:46.187297",
      modifiedAt: "2021-08-20 12:31:06.622",
      count: 5,
    },
    {
      msgId: "2021082012204575430",
      interfaceId: 5,
      status: "QUEUED",
      createdAt: "2021-08-20 12:20:46.187297",
      modifiedAt: "2021-08-20 12:27:06.473",
      count: 3,
    },
    {
      msgId: "2021082012204613152",
      interfaceId: 5,
      status: "QUEUED",
      createdAt: "2021-08-20 12:20:46.187297",
      modifiedAt: "2021-08-20 12:28:06.517",
      count: 3,
    },
  ];
}

Now I want to insert a field named mString which is status+"A" where status is from the same object.I want to insert it in every object in the above array.How can I do this?

Answer

Just loop though array and add

const data = {
  "messages": [
    {
      "msgId": "2021082111010755885",
      "interfaceId": 5,
      "status": "QUEUED",
      "createdAt": "2021-08-21 11:01:07.89554",
      "modifiedAt": "2021-08-21 11:01:07.89554",
      "count": 0,

    },
    {
      "msgId": "2021082012204615964",
      "interfaceId": 5,
      "status": "QUEUED",
      "createdAt": "2021-08-20 12:20:46.187297",
      "modifiedAt": "2021-08-20 12:31:06.622",
      "count": 5,

    },
    {
      "msgId": "2021082012204575430",
      "interfaceId": 5,
      "status": "QUEUED",
      "createdAt": "2021-08-20 12:20:46.187297",
      "modifiedAt": "2021-08-20 12:27:06.473",
      "count": 3,

    },
    {
      "msgId": "2021082012204613152",
      "interfaceId": 5,
      "status": "QUEUED",
      "createdAt": "2021-08-20 12:20:46.187297",
      "modifiedAt": "2021-08-20 12:28:06.517",
      "count": 3,

    }
  ]
}

data.messages.forEach((node) => node.mString = node.status + "A");

console.log(data);