Node.js Bot.start() Method

The Bot.start() method is used in the Node.js Telegraf Bot Module. This module provides various functions to interact with the official Telegram Bot API. This method executes when a new user first time starts the bot or types a reserved module keyword /start.

Syntax: 

TelegrafBot.start(callback function(Context function))

Parameters: This Method accepts one parameter as mentioned above and described below: 

• Callback function: It accepts only one parameter that holds the Update object from Telegram API.

Return Type: The return type of the function is void. 

Installing Module: Install this module using the following command: 

npm install telegraf

Steps to get the keys: 

First, get the GET BOT_TOKEN from BOTFATHER in the telegram. Just search for BOTFATHER in Telegram and select the verified one as shown below: 

Type /start and then click on /newbot as shown below: 

Now type the name of the bot and that must be unique. 

Now just copy the token From the BotFather. And for deleting the token simply search /delete the token in BotFather.

Project Structure: 

Filename: bot.js 

Javascript

// Requiring module
const telegraf = require("telegraf");

// Set your token
const token = 'YOUR_TOKEN';

// Creating a new object of Telegraf
const bot = new telegraf(token);

// The ctx object holds the update
// object from Telegram API
bot.start(ctx => {

    // Sending the message
    ctx.reply("Thanking you for choosing new bot");
});

// Calling the launch function
bot.launch()

Run the bot.js file using the following command:

node bot.js

Output: