According to the error message in the browser's dev tools the Employee.json file was not found. That means the path is wrong or the file does not exist in the application root. Have you checked if the file exists in production?
GET https://mets.azurewebsites.net/Employees.json 404 (Not Found)
If you are Visual Studio to publish the app, click on the file in solution explorer and set the "Copy to Output Directory" to "Copy Always"
Otherwise, simply copy the file to the application root.