JSONDecoderError: Extra data

{
   "backend_port":6712,
   "website_port":5000,
   "secret_key":"MY_PRECIOUS_SECRET_KEY",
   "salt":"MY_TABLE_SALT",
   "ssl":false,
   "ssl_cert":"/home/andres/.mycroft/personal_backend/certs/MycroftPersonalServer.crt",
   "ssl_key":"/home/andres/.mycroft/personal_backend/certs/MycroftPersonalServer.key",
   "mail_user":"xxx@gmail.com",
   "mail_password":"xxx",
   "mail_server":"smtp.googlemail.com",
   "mail_port":465
}{
   "stt":{
        "module":"google",
        "google":{

        }
   }
}

I get this response:

json.decoder.JSONDecodeError: Extra data: line 1 column 429 (char 428)