[Telerik Kendo UI][dotnet core 2.x] Grid not showing data

Startup.cs

// I was getting an empty grid even though the POST request returned a [200] response
// and there was data in the response body when I checked the browser console.
// 
// Turns out .NET Core MVC has a behavior of formatting anything that passes the Json() function to be camelCased.
// Telerik Kendo was probably looking for something like "response.Data" but the response gave "response.data", note the lowercase

// Go to your Startup.cs in your project and add the following to the MVC services

services.AddMvc()
  .AddJsonOptions(option => option.SerializerSettings.ContractResolver = new DefaultContractResolver()); // Add JsonOptions
  
// If camelCase was the issue, it should be solved
// I wasted half a day to figure what was wrong since no error was thrown, hope it helps whoever needs this