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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.
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Many of the other files that come with the base "hello-world" web component serve important purposes also. I've annotated many of the files found in this project and uploaded them to a GitHub repository that can be found here.
Yarn is another package manager for JavaScript. It is very similar to npm as it enables users to reuse code from other developers by helping them register dependencies in their project. It registers dependencies to the package.json just like npm.
The next step is to download Node.JS. You want to get the current LTS (Long Term Support) version for increased stability. To install, head to nodejs.org and click the nice big green "LTS" button. The site should recognize the OS that you are working with and give you the right installer.