Inform users before they upload if the file is too large or the wrong format.
The humble file upload is a microcosm of web development: it touches frontend UX, backend security, network performance, and legal compliance. To do it well, you must balance competing needs. upload file
| Regulation | Requirement | |------------|-------------| | GDPR / CCPA | Right to delete uploaded files; obtain consent before scanning content; log access. | | HIPAA (healthcare) | Encrypt files at rest (AES-256) and in transit (TLS 1.2+); audit trails. | | PCI-DSS (payment cards) | Never allow upload of unencrypted PAN; scan all files for malware. | | FINRA / SEC | Retain uploaded financial records for 5-7 years; immutable storage. | Inform users before they upload if the file