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Developers often ignore frontend security. They think the backend does everything. Your frontend is your first line of defense. It stops attacks before they hit your server.
- Stop XSS: Clean user content. Use textContent instead of innerHTML. Modern frameworks do this by default.
- Stop CSRF: Use tokens and SameSite cookies. This stops malicious sites from making requests for your users.
- Use CSP: Content Security Policy limits what loads on your page. It stops most XSS attacks.
- Secure Cookies: Set cookies to HttpOnly and Secure. Use SameSite=Strict. Do not store tokens in localStorage. JavaScript steals them there.
- Safe Auth: Use authorization code flow with PKCE for OAuth. Put tokens in HttpOnly cookies. Keep tokens out of URLs.
- Third Party Risk: Self-host important scripts. Use Subresource Integrity tags for CDNs.
Security is a team effort. Your frontend protects the browser. Your backend protects the server. You need both.
Source: https://dev.to/therizwansaleem/frontend-security-xss-csrf-csp-and-secure-authentication-flows-4bg9