DEV Community: Randomiser

How to create whatsapp bot using javascript ?

Randomiser — Wed, 01 Dec 2021 13:39:07 +0000

To build a whatsapp bot we will be using whatsapp-web.js

Step 1) Create a project
Run following commands

$ npm i whatsapp-web.js

You will also require to install qrcode-terminal for generating QR Code. Install it using

$ npm i qrcode-terminal

Step 2) Create index.js

Add following code

const qrcode = require('qrcode-terminal');

const { Client } = require('whatsapp-web.js');
const client = new Client();

client.on('qr', qr => {
    qrcode.generate(qr, {small: true});
});

client.on('ready', () => {
    console.log('Client is ready!');
});

client.initialize();

First it will Display QR code,
you can scan in your whats app -> Linked devices and add new device

After Sucessfully Scan you should get message
"Client is ready!"

Step 3) Listen to Messages

client.on('message', message => {
    console.log(message.body);
});

Inside on message call back you will get message object and listen to specific message like this

client.on('message', message => {
    if(message.body === '!ping') {
        message.reply('pong');
    }
});

Step 4) Saving session
One proble you will face is ,you have to scan QR Code every time.

So for that you can store your session in .json file and when it will start app ,first it will check that is already authenticated or not, and if its authenticated
then continue using previous session.

So first we have to import 'fs' for creating a .json file

const fs = require('fs');
const { Client } = require('whatsapp-web.js');

// Path where the session data will be stored
const SESSION_FILE_PATH = './session.json';

// Load the session data if it has been previously saved
let sessionData;
if(fs.existsSync(SESSION_FILE_PATH)) {
    sessionData = require(SESSION_FILE_PATH);
}

// Use the saved values
const client = new Client({
    session: sessionData
});

// Save session values to the file upon successful auth
client.on('authenticated', (session) => {
    sessionData = session;
    fs.writeFile(SESSION_FILE_PATH, JSON.stringify(session), (err) => {
        if (err) {
            console.error(err);
        }
    });
});

Step 6) Downloading Media

client.on('message', async msg => {
    if(msg.hasMedia) {
        const media = await msg.downloadMedia();
        // do something with the media data here
    }
});

Step 7) Sending Media

const { MessageMedia } = require('whatsapp-web.js');

const media = new MessageMedia('image/png', base64Image);
chat.sendMessage(media);

I have created my own bot using this package
Click here to see my bot

15 Tips For Being A Great Programmer

Randomiser — Wed, 24 Mar 2021 11:16:01 +0000

1.Delete unused code
No need to save useless code, delete the code whenever it's necessary.

2. Learn to read other’s code
you should read others’ code as well to become a great programmer. When you will try to understand someone else’s code your thinking capabilities will increase. you can goto GitHub. and check open-source codes.

3.Pair program
Pair programming allows you to play the role of both teacher and student.

4.Get involved in the community
Surrounding yourself with like-minded people will motivate you to push through the lows. create coders community, join discord server of coders and connect with great developers on Twitter/LinkedIn.

5.Learn by doing
Don’t just watch tutorials or just read books, make projects while learning.

6.Keep learning
The more you learn the more you earn ,That’s very true,you have to learn daily.every day new technology is coming you should be updated with all these.

7.Be open-minded
Technology changes, and it changes quickly. Don’t oppose new technology; learn it and then form an opinion.

Checkout my website for complete post click here

Download Instagram reels video in a flutter.

Randomiser — Tue, 11 Aug 2020 14:11:21 +0000

Hello friends, I have published the flutter package flutter_insta to pub.dev

Using this package you can get details of the Instagram user such as profile picture URL, a number of followers, following, Bio, website and download reels video.

Package link: https://pub.dev/packages/flutter_insta

Github link: https://github.com/viralvaghela/flutter_insta

Example:

import 'package:flutter_insta/flutter_insta.dart';

String downloadLink =  await flutterInsta.downloadReels("https://www.instagram.com/reel/CDlGkdZgB2y/"); //URL

Published my first flutter package

Randomiser — Sat, 25 Jul 2020 12:55:08 +0000

Hello developers, Today I have published my first flutter package flutter_insta to pub.dev.

Using this plugin you can get details of the Instagram user.

How to Use ?

LINK : https://pub.dev/packages/flutter_insta

First add in dependency

dependencies:
  flutter_insta: ^0.0.6

You can install packages from the command line:

$ flutter pub get

Import it

import 'package:flutter_insta/flutter_insta.dart';

Now you have to create object of FlutterInsta class

FlutterInsta flutterInsta = new FlutterInsta("coding_boy_");

and inside constructor pass the username.

Now you can get all details like this

print("Username : ${flutterInsta.username}");
print("Followers : ${flutterInsta.followers}");
print("Folowing : ${flutterInsta.following}");
print("Bio : ${flutterInsta.bio}");
print("Website : ${flutterInsta.website}");
print("Profile Image : ${flutterInsta.imgurl}");

Thanks for reading :) , if you found it useful then please like the plugin and give your valuable feedback.

Answer: Is there any API in Java to access wikipedia data

Randomiser — Thu, 02 Jul 2020 15:38:12 +0000

Jun 5 '20

You can use Jwiki to get Wikipedia data Example :

Jwiki jwiki = new Jwiki("elon musk");
System.out.println("Title :"+jwiki.getDisplayTitle()); //get title
System.out.println("Text : "+jwiki.getExtractText());  //get summary text
System.out.println("Image : "+jwiki.getImageURL());    //get image URL

Open Full Answer

Wikipedia Scraper in Java

Randomiser — Fri, 05 Jun 2020 14:15:59 +0000

i have created a simple java tool to get data from Wikipedia.

Have a look here on Github Repo

Example

 Jwiki jwiki = new Jwiki("elon musk"); 
 System.out.println("Title :"+jwiki.getDisplayTitle());
 System.out.println("Text : "+jwiki.getExtractText());  
 System.out.println("Image : "+jwiki.getImageURL());

Telegram Bot in Java

Randomiser — Mon, 18 May 2020 13:45:47 +0000

Hello world, recently I have create a telegram bot using java and spring boot.

This bot will show you random programming joke, programming quote and COVID live data.

you can check source code on my Github repo

https://github.com/viralvaghela/Telegram-Bot-Array-Index-Out-Of-Bound