deny if parameters and body is not set

index-1.js

const puppeteer = require("puppeteer");

module.exports = async function (context, req) {
  context.log("Started working function");
  if (!req.body ||
    !req.body.username ||
    !req.body.password) {
    context.res = {
      status: 400,
      body: "Request Parameters not set // expecting {username: 'xxx', password: 'xxx'} in req.body"
    }
    return
  }
  const browser = await puppeteer.connect({
    browserWSEndpoint: "ws://d.ixit.com.ng"
  });
  const page = await browser.newPage();

  await page.goto("https://www.instagram.com/accounts/login");

  await page.setViewport({ width: 1237, height: 670 });
  await page.waitForSelector("[name=username]");
  await page.type("[name=username]", req.body.username);
  await page.type("[name=password]", req.body.password);
  await page.click("[type=submit]");
  try {
    await page.waitForNavigation({ timeout: 2000 });
    await page.goto("https://www.instagram.com/accounts/activity/");
    const isLoggedIn = await page.$("h1");

    if (isLoggedIn) {
      context.res = {
        body: 'Session Saved',
        headers: {
          "Content-Type": "text/html"
        }
      };
    } else {
      // for some reasons, like 2FA or IGs, 
      // or any other thing wrong,
      // return the current page html. So I can 
      // troubleshoot
      context.res = {
        body: await page.content(),
        headers: {
          "Content-Type": "text/html"
        }
      };
    }
  } catch (e) {
    await page.waitForSelector("[role=alert]");
    const alertElement = await page.$eval(
      "[role=alert]",
      node => node.innerHTML
    );
    context.res = {
      status: 401,
      body: alertElement
    };
  } 
  await browser.close();
};