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webpack
A bundler for javascript and friends. Packs many modules into a few bundled assets. Code Splitting allows for loading parts of the application on demand. Through "loaders", modules can be CommonJs, AMD, ES6 modules, CSS, Images, JSON, Coffeescript, LESS, ... and your custom stuff.
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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.
You can use an online service like beautifier.io to try to clean it up a bit. There is no way to get the original human readable JS back though. If you are interested in reading source code, you might have more luck looking at repos on GitHub, which will not be minified.
I don't know to be honest (about the specifics). Have a look at Webpack - that's one of the more common tools for doing this sort of thing, so it'll give you a flavour of what's going on.