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Node.js Bot.hears() Method
  • Difficulty Level : Expert
  • Last Updated : 05 Jan, 2021

The Bot.hears() method is used in the Node.js telegraf Module. This module provides various functions to interact with the official Telegram Bot API. This method executes when the given captured message matches with given keywords. 
Syntax: 

TelegrafBot.hears(keyword, callback)

Parameters: This Method accepts two parameters as mentioned above and described below: 

  • keyword: It can be array, String, or mixed that to be matched.  
  • Callback: This function encapsulate telegram update information and executes it when a keyword matches.

Return Type: The return type of the function is void.
Installing Module: Install the module using the following command: 

npm install telegraf

Steps to get the keys:

Step 1: 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:
 



Step 2: Type /start and then click on /newbot as shown below:
 

Step 3: Now type the name of the bot and that must be unique.
 

Step 4: Now just copy the token From the BotFather. And for deleting the token simply search /delete token in BotFather.

Project Structure:

Filename: bot.js

Javascript

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// Requiring module
const telegraf = require("telegraf");
  
// Your Token
var token = 'Enter your token';
  
// Creating object of Telegraf
const bot = new telegraf(token); 
  
bot.hears("GFG", ctrx => {
  
  // ctx object holds the Update object
  // from Telegram API So you can use
  // everything you see there
    
  // Exexutes when 'GFG' keyword match
  ctrx.reply("GFG valid Form");  
})
  
bot.hears("ByeBye", ctrx => { 
  
  // Executes when 'ByeBye' keyword match
  ctrx.reply("Bye bye");  
})
  
// Launch the program
bot.launch()

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Run bot.js file using the following command:

node bot.js

Output:

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