Reading JSON Configuration Files in ASP.NET Core

        public IConfigurationRoot Config { get; } = new ConfigurationBuilder()
                .SetBasePath(System.IO.Path.Combine(System.IO.Directory.GetCurrentDirectory(), "Options"))
                .AddJsonFile("SystemConfig.json", optional: true, reloadOnChange: true)
                .Build();

This method can read the configuration from the JSON file.
It can only read and cannot write.