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React builds great interfaces. It does not make your app immune to attacks. You must protect your user data.
Follow these steps to secure your React applications.
Stop Cross-Site Scripting (XSS)
XSS happens when attackers inject scripts into your pages. React escapes values in JSX by default. This prevents most attacks.
Do not use dangerouslySetInnerHTML unless you have no choice. If you use it, use a library like DOMPurify to clean the content first.
Store tokens safely
Where you store authentication tokens matters.
- LocalStorage: Avoid this. Attackers use XSS to steal tokens from here.
- HttpOnly Cookies: Use this. Setting HttpOnly and Secure flags prevents JavaScript from accessing the cookie.
Protect your routes
Create private routes using Hooks or Higher-Order Components. Always back your client-side checks with server-side validation. Never trust the client alone.
Validate all input
Sanitize user input before it reaches your backend. Your API endpoints are the main targets for data manipulation.
Manage your dependencies
A single bad package can ruin your security.
- Use npm audit to scan for vulnerabilities.
- Keep packages updated with tools like Dependabot.
Use a Content Security Policy (CSP)
Set up a CSP on your server. This tells the browser which content sources are trusted. It adds a layer of defense against XSS and injection attacks.
Security is a constant process. Use React protections and follow industry standards to build safer apps.
Source: https://dev.to/farukh/essential-web-security-best-practices-for-react-js-2f0d