Telegram Bot - Save Group Messages

This is the code to save group messages in a MySQL database using Telegram Bot API.

//Using Telegram Bot API for easy usage of telegram messages.
const TelegramBot = require('node-telegram-bot-api');

//Using Mysql to save mesages to mysql database
var mysql = require('mysql');


//initiate a mysql connection.
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : '',
  database : 'telegram'
});

//connect to mysql
connection.connect();


//CHange the Bot Token as per your Bot's Token
const token = '';

const bot = new TelegramBot(token, {polling: true});


//On Message event in group

bot.on("message", (msg) => {
    
    //chat id of user and message id of the message
    var chat_id = msg.chat.id;
    var msg_id = msg.message_id;
    
    
    //FROM PART
    var user_id = msg.from.id;
    var bot_check = msg.from.is_bot;
    var first = msg.from.first_name;
    var username = msg.from.username;
    
    //GROUP DETAILS
    var group_name = msg.chat.title;
    var group_username = msg.chat.username;
    
    //message send by the user
    var message = msg.text
    
    var date = msg.date;
    
    
    console.log(msg);
    
            if(bot_check == false){

                
                //MYSQL Coding
                
                            var user_name = "null";
                            var group_user_name = "null";
                            var name_group = "null";

                            if(!isEmpty(username)){
                               user_name = username;
                            }

                            if(!isEmpty(group_username)){
                               group_user_name = group_username;
                            }

                            if(!isEmpty(group_name)){
                               name_group = group_name;
                            }



                            var post  = {user_id: user_id , first: first , username: user_name,  group_name: name_group , group_username: group_user_name , num_msg: "0" , date: date};
                
                            ///Change Data structure as per your convenience

                            var query = connection.query('INSERT INTO users SET ?', post, function (error, results, fields) {
                              if (error) throw error;
                              
                            });

                        

                });


            }
        
        
    });


bot.on('polling_error', (error) => {
  console.log(error);  // => 'EPARSE'
});

function isEmpty(value) {
    return typeof value == 'string' && !value.replace(/\s/g,'') || typeof value == 'undefined' || value === null;
  }

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