Storing Uploaded Files and Serving Them in Express

Short summary

Learn how to persist uploaded files with Multer and expose them via URLs using Express's static file serving middleware. The complete guide covers storage configuration, public URL construction, and critical security practices including MIME type validation and filesize limits. Production tips include environment-based URL configuration and defense against arbitrary file types.

• •Multer uploads to local filesystem; express.static serves them via URLs
• •Critical: validate file types and sizes; sanitize filenames to prevent collisions
• •For production: externalize baseUrl to environment variables and implement security filters

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