A script that logs you into Instagram using JavaScript & Google Puppeteer (headless Chrome)

log-in-to-instagram.js

/* INSTRUCTIONS ON HOW TO RUN VIA COMMAND LINE
 * $ node -v
 * $ 12.14.0
 * $ npm -v
 * $ 6.14.9
 * $ cd directory-containing-log-in-to-instagram-script
 * $ npm init
 * $ npm install puppeteer
 * $ node log-in-to-instagram.js 
*/

const puppeteer = require('puppeteer');

const instagramUrl = 'https://www.instagram.com';
const instagramLoginPath = 'accounts/login';

const user = 'yourUsername'; // change this to your username
const pass = 'yourPassword'; // change this to your password

const usernameFieldSelector = 'input[type=text][name=username]';
const passwordFieldSelector = 'input[type=password][name=password]';
const loginButtonSelector = 'button[type=submit]';

const statCountSelectorMap = new Map([
  ['posts', '#react-root > section > main > div > ul > li:nth-child(1) > span > span'],
  ['followers', '#react-root > section > main > div > ul > li:nth-child(2) > a > span'],
  ['following', '#react-root > section > main > div > ul > li:nth-child(3) > a > span'],
]);

const browserOptions = {
  headless: true,
  slowMo: 100,
  defaultViewport: { width: 350, height: 600 },
  isMobile: true,
};

(async () => {
  // initialize the browser
  const browser = await puppeteer.launch(browserOptions);

  // initialize page to be scraped
  const page = await browser.pages().then((pages) => pages[0]);

  // navigate to the login page
  await page.goto(`${instagramUrl}/${instagramLoginPath}`);

  // wait for username field to appear
  await page.waitForSelector(usernameFieldSelector);

  // fill in username and password then click login button
  console.log('filling username ...\n');
  await page.click(usernameFieldSelector);
  await page.type(usernameFieldSelector, user);
  console.log('filling password ...\n');
  await page.click(passwordFieldSelector);
  await page.type(passwordFieldSelector, pass);
  console.log('clicking login button ...\n');
  await page.waitForSelector(loginButtonSelector);
  await page.click(loginButtonSelector);
  await page.waitForTimeout(2000);

  // navigate to your instagram page
  console.log('looks like we logged in\n');
  console.log('navigating to the instagram page of this user\n');
  await page.goto(`${instagramUrl}/${user}`);
  await page.waitForSelector(statCountSelectorMap.get('posts'));

  console.log(`here are the stats for ${user}`);

  statCountSelectorMap.forEach(async (selector, stat) => {
    const statCountElementHandle = await page.$(selector);
    const statCountJSHandle = await statCountElementHandle.getProperty('innerText');
    const statCount = await statCountJSHandle.jsonValue();
    console.log(`\t# of ${stat}: `, statCount);
  });
  
  console.log('\ndone, closing browser\n');
  await browser.close();
})();