Read (Parse) JSON data from URL in Windows Forms using C# and VB.Net

Use WebClient class.

Refer below example.

First import the Newtonsoft.Json namespace.

Code

C#

protected void Page_Load(object sender, EventArgs e)
{
    ServicePointManager.Expect100Continue = true;
    ServicePointManager.SecurityProtocol = (SecurityProtocolType)3072;
    WebClient webClient = new WebClient();
    string json = (new WebClient()).DownloadString("https://raw.githubusercontent.com/aspsnippets/test/master/Customers.json");
    DataTable dt = JsonConvert.DeserializeObject<DataTable>(json);
}

VB.Net

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    ServicePointManager.Expect100Continue = True
    ServicePointManager.SecurityProtocol = CType(3072, SecurityProtocolType)
    Dim webClient As WebClient = New WebClient()
    Dim json As String = (New WebClient()).DownloadString("https://raw.githubusercontent.com/aspsnippets/test/master/Customers.json")
    Dim dt As DataTable = JsonConvert.DeserializeObject(Of DataTable)(json)
End Sub

The use the DataTable to do rest of the task.

Refer below article for more details.

Read (Parse) JSON data from URL in ASP.Net using C# and VB.Net

As per your JSON use below code.

C#

DataTable dt = JsonConvert.DeserializeObject<DataTable>("[" + json.Replace("CREDENTIALS:", "") + "]");

VB.Net

Dim dt As DataTable = JsonConvert.DeserializeObject(Of DataTable)("[" + json.Replace("CREDENTIALS:", "") + "]")