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styled-components
Visual primitives for the component age. Use the best bits of ES6 and CSS to style your apps without stress π
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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.
3. Styled Component - If you familiar to CSS then you know that there are some limitation there like you can't use conditions directly there but in Styled component which is a module , you can use inline css and can use conditions in css. It's optional but still i want you to have a look. styled docs
4. use Context and Redux - At last but my favorite part is Redux , without going in details if you want to use same value in different component(files) then you can use Redux or use Context in Reactjs. Both will do the job but if your project is large then go for Redux or go for use Context. I used it to give dark and light mode functionality in my website Ref - Redux