xss-prevention

To prevent XSS when rendering user-generated content, you must apply context-aware output encoding for HTML, attributes, JavaScript, and URLs. This ensures injected script tags are safely escaped before execution in the browser.

The best way to sanitize user-provided HTML is using dedicated libraries like DOMPurify. This safely removes malicious code while preserving permitted formatting, ensuring scripts embedded in user input cannot execute in other users' browsers.

You need a Content Security Policy (CSP) to mitigate XSS impact by restricting resource loading and script execution. Implementing CSP headers adds a defense-in-depth layer alongside output encoding and input sanitization.

Yes, this XSS prevention guidance offers framework-specific best practices for React and Vue.js. It helps developers securely handle dynamic HTML rendering and construct frontend components without introducing script injection vulnerabilities.

Output encoding fails to stop XSS when applied incorrectly for the execution context, such as using HTML encoding inside JavaScript or URL attributes. Context-aware encoding functions are required to prevent script injection across all contexts.