Go to Instagram and login to your account for which you want to find out the list of desired accounts
Go to your profile and open up followers or following list
Could automate this process in the future, but for now, manually scroll down to the bottom of the list so that all the nodes containing the account names are present on the screen
Check the classname of any of the account name by right clicking on it and selecting inspect, which right now will be a span element and containing a class .se6yk
Select all the elements by typing the following the commands in your browser's console
Copy accountNames and if this list corresponds to followers, then create a followers.js file and store the copied array in variable named followers and export it using the following snippet
module.exports={ followers }
Follow the above two points for other list as well
Once you have created both followers.js and following.js, open up terminal and run the following command to get the list of accounts not following you back
node index.js
About
Simple piece of code which lets the user determine the accounts which are not following back the user