For Instagram

index.js

// This file is relative, it could be any name but the extension should be .js, as in javascript.

const Client = require('instagram-private-api').V1;
const device = new Client.Device('my_device');
const storage = new Client.CookieFileStorage(__dirname + '/cookies/my_account.json');

Client.Session.create(device, storage, 'my_username', 'my_password')
    .then(session => {
        return session.getAccount();
    })
    .then(account => {
        console.log(`Username: ${account.params.username}`);
        console.log(`Number of followers: ${account.params.follower_count}`);
    })
    .catch(err => {
        console.log(`Error: ${err}`);
    });

install.sh

# Copy and paste this code in shell / terminal after you've navigated into the code directory, this file doesn't matter, only the npm code below does.

npm install instagram-private-api