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turbo
The speed of a single-page web application without having to write any JavaScript (by hotwired)
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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.
So if you have used hotwired/turbo you will get a pretty SPA like experience with very little work. Turbo goes a long way to make a traditional multi page application feel like a SPA (single page application).
I'm using morphdom to patch our DOM. Its a very simple library that compares two DOM elements and updates only the differences. It is extremely performant and does not even use a Virtual DOM, just the DOM you already have!