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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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View on GitHub
How did I settle on Svelte? I'm already working in React and Vue and have worked a little with Ember long ago (I've even played with the now abandoned Cell.js). Angular seems to be a different flavor of the React/Vue/Ember gang. Svelte though looks to have some novel ideas that I wanted to expose myself to.
Every three months, Root sets aside three days (called "hack days") for all its engineers to work on something of their choice. This time around I wanted to have some fun and also learn a little about Svelte (Root mostly uses React & React Native). So I chose to make a browser-based Wireworld using Svelte!
I had no idea how bad listening for things like key presses and dragging events are today. Given how nice and fairly standard a lot of the APIs across browsers and platforms have become, I was shocked at how rough this space is. I think if I had to do this again, this will be one area where I defer to a library (like hammer.js).