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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
The passwords are encrypted using salted sha512 and stored in the database. You can check out my implementation at https://github.com/JoshuaPeddle/Notes-app.
Curios what the backend is comprised of. If you're not already using it take a look at PassportJS and in particular Google OAuth (and maybe other identity providers like Facebook, Apple, Github etc. It's surprisingly easy to learn and it makes maintaining secure logins extremely easy so if someone has MFA on their Google account for example they can use that without having to create a new identity.