Fix · Express / Node

Fix “Content Security Policy (CSP)” on Express / Node

Start with: Content-Security-Policy: default-src 'self'; object-src 'none'; base-uri 'self' -- then tighten.

res.setHeader("Content-Security-Policy", "default-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'");

Verify the fix

Re-run the Content Security Policy (CSP) check after deploying. Test config changes in staging first and keep a rollback: a wrong header can break a site faster than a missing one.

Other stacks: nginx · Apache · Caddy · Cloudflare

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