Unable to access user info object property - facebook chat api

Question

I'm using Facebook chat api to create a simple cli script that will reply to messages that are sent to my facebook account. I'm trying to assign and get the user name and my name to use them inside the reply but they are always undefined. I think that the object property aren't assigned correctly. Is there a fix for this?

require('dotenv').config();
const fs = require('fs');
const fb = require('facebook-chat-api'); 
const path = require('path');
const appStateFile = path.format({ dir: __dirname, base: 'appstate.json' });
let currentUser = null;

if( !fs.existsSync(appStateFile) ){
    //debug .env
    console.log(process.env);

    fb({email: process.env.FB_EMAIL, password: process.env.FB_PWD}, (err, api) => {
        if(err){ 
            return console.log(err);
        }
        console.log(api);
        api.setOptions({
            listenEvents: true
        });
        fs.writeFileSync(appStateFile, JSON.stringify(api.getAppState()));
        let id = api.getCurrentUserID();
        api.getUserInfo(id, (err, profile) => {
            console.log(profile); // profile is logged correctly
            currentUser = profile;
        });
        api.listenMqtt( (err, event) => {
            if(err){ 
                return console.log(err);
            }
            if(event.type === 'message'){
                console.log(event.body)
                api.getUserInfo(event.senderID, (err, user) => {
                    if(err){
                        return console.log(err);
                    }
                    console.log(user); // user object is logged correctly
                    api.sendMessage('...', event.threadID)
                });
            }
        });
    });
}else{
    fb({appState: JSON.parse(fs.readFileSync(appStateFile))}, (err, api) => {
        if(err){ 
            return console.log(err);
        }
        console.log(api);
        api.setOptions({
            listenEvents: true
        });

        let id = api.getCurrentUserID();
        api.getUserInfo(id, (err, profile) => {
            console.log(profile);
            currentUser = profile;
        });
        api.listenMqtt( (err, event) => {
            if(err){ 
                return console.log(err);
            }
            if(event.type === 'message'){
                console.log(event.body)
                api.getUserInfo(event.senderID, (err, user) => {
                    if(err){
                        return console.log(err);
                    }
                    console.log(user)
                    api.sendMessage(`FB Pager v1.0.\nHi ${user.name}!Your message was forwarded with an email to ${currentUser.name}.`, event.threadID)
                });
            }
        });
    });
}

Answer 1

After a lot of debug I've found the correct way to access the needed informations. Since the user informations after that are retrived are mapped to another object that is the userId, the only way to access to each property is to use a for loop. Initially I was thinking that this can be avoided but unfortunately it's necessary otherwise using only dot notation will result in undefined. This is how I've solved

api.getUserInfo(userId, (err, user) => {
  let username;
  if(err){
   return console.log(err);
  }
  for(var prop in user){
   username = user[prop].name;
  }
  api.sendMessage(`Hello ${username!}`, event.threadID);   
});