I just converted jsonNode result to lower case and now it does not matter what case the key name is in.

Using reader As New StreamReader(ext_manifest)
    Do Until reader.EndOfStream
        node_data = reader.ReadToEnd
    Loop
End Using

       
Dim node As JsonNode = JsonNode.Parse(node_data.tolower)
first_name = node("name").ToString
msgbox(first_name)