Fixed JSONEncode method for Minecraft Console Client (https://github.com/ORelio/Minecraft-Console-Client/blob/5b430562ca1194c216f05a48d792eae98b0d40ff/MinecraftClient/Protocol/ProtocolHandler.cs#L266-L290)

MinecraftConsoleClient_FixedJSONEncode.cs

/// <summary>
/// Encode a string to a json string.
/// Will convert special chars to \u0000 unicode escape sequences.
/// </summary>
/// <param name="text">Source text</param>
/// <returns>Encoded text</returns>


private static string jsonEncode(string text)
{
    StringBuilder result = new StringBuilder();
    foreach (char c in text)
    {
        if ((c >= '0' && c <= '9') ||
            (c >= 'a' && c <= 'z') ||
            (c >= 'A' && c <= 'Z'))
        {
            result.Append(c);
        }
        else
        {
            result.AppendFormat(@"\u{0:x4}", (int)c)
        } 
    }
    return result.ToString();
}