TerrariaPluginTemplate/ConfigPlugin/Config.cs

using Newtonsoft.Json;

namespace ConfigPlugin;

public class Config
{
    public string? CustomMessage;
    public string? Player;
    
    public void Write()
    {
        File.WriteAllText(ConfigPlugin.ConfigPath, JsonConvert.SerializeObject(this, Formatting.Indented));
    }

    public static Config? Read()
    {
        return !File.Exists(ConfigPlugin.ConfigPath) ? new Config() : JsonConvert.DeserializeObject<Config>(File.ReadAllText(ConfigPlugin.ConfigPath));
    }
}