File Uploads End-to-End

Part of the Full Stack Developer Roadmap.

Summary

The complete flow of a user selecting a file in React, sending it to your Express backend, and storing it (locally or in cloud storage) — touching the frontend, backend and storage layer all at once.

How to Learn This

1Build a file upload form in React sending a `FormData` request.
2Accept and validate the upload on the backend using Multer.
3Store the file in cloud storage and return a URL the frontend can display.

Full-Stack Data Flow

Next.js App Router

More topics in Connecting Frontend & Backend

CORS API Integration with Fetch/Axios React Query / TanStack Query Environment Variables & API URLs Loading & Error States Optimistic UI Full-Stack Data Flow

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