How can I set Id value to environment variable from the response when there is array?

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This is covered in the training within the Learning Center on the page Postman page after you login.

Go to Postman Training and I would start with “Galaxy APIs 101” then the “Galaxy Testing and Automation” courses.

Introduction | Postman Learning Center

Also check out the following link.

Using variables | Postman Learning Center

The code you need in the test tab of your request is as follows;

// var response = pm.response.json();
var response = 
{
    "Message": "Successfully ",
    "Status": 0,

    "ResponseCode": 0,

    "Data": [
        {
            "ID": 10675,
            "cx_lName": "Name2",
            "cx_Folder": "Folder"
        }
    ]
}

console.log(typeof(response)) // this should be a javascript object, same as pm.response.json()
console.log(response); // whats in that object

console.log(response.Data[0].ID); // first element in the data array - arrays start at zero

pm.environment.set("ID", response.Data[0].ID); // save it to an environment variable

console.log(pm.environment.get("ID")); // console log that environment variable
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