HTML Sanitization Guide: DOMPurify and Allowlist Rules
Sanitize HTML to prevent XSS: use DOMPurify allowlists, strip event handlers, and understand which tags and attributes are safe to keep.
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Tags: html, security, sanitization
HTML Sanitization Guide: DOMPurify, Sanitize.js, and Allowlist Rules When users can submit HTML content that gets rendered in a browser — rich text editors, comment systems, documentation wikis, email preview tools — you have an XSS attack surface. Sanitization is the process of removing or neutralizing HTML that could execute attacker-controlled code. The wrong approach is writing a regex that removes tags. The right approach is using a dedicated sanitization library that applies an allowlist of safe tags and attributes. This guide covers how to do that correctly. Why Regex Sanitization Fails Before getting into libraries, it's worth understanding why ad-hoc sanitization fails. These are all valid XSS vectors that bypass naive filters: A regex can catch but not . It can catch but not…
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