finishing a notification -system & other features

I've created a system that has a client and an admin area and I need help getting notifications to appear on both sides. The notification has a bell with the number of unseen messages the same as YouTube. I need that to display whenever a message is sent to the intended user. I also have some dummy data from MongoDB (an array of objects) that needs to be pulled in and format into an HTML table that will appear in a PDF. I've written the code to generate the PDF, just need the data formatted to look good in the PDF. I also need help with creating an array of objects from a dynamic form on a webpage. Each time a button is clicked a set of new text fields are presented to the user. The values from those text fields need to be stored in an array of objects in MongoDB. The keys are the same in each object in the array. There is exactly 7 key/value pairs, once it reaches the 7, a new object with the new key/value pairs from the text fields should be added to a new object in the array.I have an example if it sounds too abstract. It's really not. If you also have any experience with passwordless authentication and can give advice, it would be very much appreciated. I have a GitHub repo available and you'll need some time for me to demo the project to be sure we understand one another.