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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.
That depends. If the value you're trying to get is put there statically on the webpage, then you can just use fetch to download the website, (depending on your node version you may need node-fetch) and use something like htmlparser2 to find the value you need. If the value you need is put there dynamically, like it's a modern SPA, it would probably be easier to use puppeteer which basically gives you access to the website through a headless browser.