This is the detail write up for my previous tutorial posted on DTube.

source

What Will I Learn?

• Discord.js API
• Trigger a discord bot
• Simple GET request with Axios

Requirements

• Node.js installed and discord account with developer's mode enabled
• Basic understanding on Node.js , NPM and Yarn

Difficulty

Basic

Description

Setting up Discord Account

Setting up the bot on https://discordapp.com and choose

Developers > My App > New App >

Fill up the details > Create a bot >

Copy the Discord Token Generated and save in .env >

Generate a link to add the bot

Install NPM packages

Run npm init or yarn init to initialise the project.

• Run npm install discord.js dotenv axios --save or yarn add discord.js dotenv axios to install require library.
• Run npm install --save-dev nodemon or yarn add --dev nodemon to install required development library.

discord.js - A library to make Discord bot.
dotenv - to save private data in .env file
axios - A HTTP Request library
nodemon - A library that watch .js file, when on change it will restart node.

Start the project

In root folder create a file call index.js.

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const Discord = require('discord.js');
const dotenv = require('dotenv');
const axios = require('axios');
dotenv.config();

Import all required dependencied/library

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const client = new Discord.Client();

Create a discord client

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client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});

When the bot is connected to Discord shows in the console

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client.on('message', msg => {
// MAIN CODE HERE
})

When the bot received a discord message, this client will listen to that event

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client.login(process.env.DISCORD_TOKEN); 

Login to the server with the token generated previously

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In the main code (client.on('message', msg => {}))

Check wether the message belongs to bot or not.

  if (msg.author.id !== 'BOT_ID') {
    // INSERT CODE HERE
  }

If trigger ($) is called in the channel

    let trigger = '$';
    let content = msg.content;
    let firstLetter = content.substring(0, 1);
    if (firstLetter === trigger) {
     // INSERT CODE HERE
    }

After trigger check the option

let option = content.substring(1).split(' ')[0];
switch (option) {
  case 'help':
    msg.reply('help');
    break;
  case 'weather':
    msg.reply('good weather');
    break;
  case 'api':
    // DO SOMETHING
    break;
  default:
    msg.reply('error');
}

So when $help will make bot reply 'help', and $weather the bot will reply 'good weather'.

In the case 'api': we are going to call an API using Axios library.

axios
            .get('https://reqres.in/api/users?page=2')
            .then(data => data.data)
            .then(data => {
              msg.reply(`\`\`\`${data.total}\`\`\``);
            });
break;

Axios will set a get request to https://reqres.in/api/users?page=2 and the data received in total value will be return. Some advance stuff you can do with API like getting weather data, currency price in CoinMarketCap and more features.

The full source code

const Discord = require('discord.js');
const dotenv = require('dotenv');
const axios = require('axios');

dotenv.config();

const client = new Discord.Client();

client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});

client.on('message', msg => {
  if (msg.author.id !== '417272012835258388') {
    let trigger = '$';
    let content = msg.content;
    let firstLetter = content.substring(0, 1);
    if (firstLetter === trigger) {
      let option = content.substring(1).split(' ')[0];
      switch (option) {
        case 'help':
          msg.reply('help');
          break;
        case 'weather':
          msg.reply('good weather');
          break;
        case 'api':
          axios
            .get('https://reqres.in/api/users?page=2')
            .then(data => data.data)
            .then(data => {
              msg.reply(`\`\`\`${data.total}\`\`\``);
            });
          break;
        default:
          msg.reply('error');
      }
    }
  }
});

client.login(process.env.DISCORD_TOKEN); // Start server

To run this, simply just run node index.js or nodemon index.js

Video Tutorial

DTube

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YouTube

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Posted on Utopian.io - Rewarding Open Source Contributors

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