Send Message BOT Telegram NodeJs

Intruduction

Create telegram bot to send message from NODEJS Apps.

Create BOT Telegram

• Goto BotFather
• Open it from mobile device or web.telegram.org
• type

  \newbot

• Follow instruction
• When completed youll get API Token, copy it to somewhere saved.

Test BOT

• Open Postman/Insomnia or anything like that.
• Create GET request sample.

    # HTTP request format
    # https://api.telegram.org/bot<token>/METHOD_NAME

    # our first method /getMe
    https://api.telegram.org/bot123456:ABC-DEF1234ghIkl-zyx57W2v1u123ew11/getMe

• Now you can see your user data

Building NodeJS

• Init nodejs app

    # configure as needed
    npm init;

    # install dependencies
    npm i express axios body-parser --save;

    # create main file
    touch index.js;

• Create index.js

    // Dependencies
    const express = require('express');
    const app = express();
    const axios = require('axios');
    const bodyParser = require('body-parser');
    const port = 80;
    const url = 'https://api.telegram.org/bot';
    const apiToken = '{api-token-given-by-BotFather}';
    // Configurations
    app.use(bodyParser.json());
    // Endpoints
    app.post('/', (req, res) => {
        // console.log(req.body);
        const chatId = req.body.message.chat.id;
        const sentMessage = req.body.message.text;
        // Regex for hello
        if (sentMessage.match(/hello/gi)) {
            axios.post(`${url}${apiToken}/sendMessage`,
                {
                        chat_id: chatId,
                        text: 'hello back 👋'
                })
                .then((response) => {
                        res.status(200).send(response);
                }).catch((error) => {
                        res.send(error);
                });
        } else {
            // if no hello present, just respond with 200
            res.status(200).send({});
        }
    });
    // Listening
    app.listen(port, () => {
        console.log(`Listening on port ${port}`);
    });

• Try access route and it will send notif to your telegram

Reference

• Create bot telegram