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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.
Another inspiration was Stockinformer, where I liked the alarm feature. I wanted to build something similar of my own using free time over the holidays. An alert system that only notifies when there is a drop. And the buying part I'd then do manually. I didn't want to spend too much time on a code that would probably be forgotten once it's successfully served its purpose. I'm located in Germany, so I focused on EU stores that ship to Germany. If you're here for the code, you can jump straight to it.