Should I create all folders upfront in a React project?
No. A simple structure you can grow is better than an elaborate one you do not understand. Add folders as the project demands them, not preemptively, to avoid over-engineering before you even know what you need.
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More FAQs in How to Plan the Project Structure for a React UI Build
List the screens, identify reusable components, group files by feature, sketch the component tree to see where state should live, plan routing, and keep it simple initially. Add folders as the project demands them, not preemptively.
Because it keeps related code together. A 'feed' feature has its components, hooks, and styles in one place, so you find everything about it quickly. Grouping by file type scatters related code across many folders.
Because it reveals where state should live and which props will be passed, before you write a line of code. This catches design issues early when they are cheap to fix, instead of during coding when they cause rework.
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