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Nginx

413 Request Entity Too Large on file upload

The Issue

Users trying to upload files get 413 Request Entity Too Large.

Root Cause

Nginx has a default `client_max_body_size` of 1MB. Any upload larger than this is rejected before it reaches your app.

How to Fix
  1. Increase the limit in nginx.conf inside the `server` or `location` block: `client_max_body_size 50M;`
  2. Reload nginx: `sudo systemctl reload nginx`
  3. Also check if your app framework has its own body size limit (Express: `express.json({ limit: "50mb" })`)
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