DOMPurify vs @fastify/helmet: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
DOMPurify is a free runtime application self-protection tool. @fastify/helmet is a free runtime application self-protection tool. Compare features, ratings, integrations, and community reviews side by side to find the best runtime application self-protection fit for your security stack.
CST VerdictBased on our analysis of available product data, here is our conclusion:
Frontend developers and security teams protecting user-facing applications from XSS will find DOMPurify essential because it strips malicious scripts from HTML without breaking legitimate functionality, something most sanitizers fail at consistently. With 16,746 GitHub stars and active maintenance across thousands of production deployments, the library has been battle-tested against real XSS vectors that OWASP regularly updates. Skip this if your threat model requires server-side output encoding as your primary defense; DOMPurify is client-side hygiene, not a replacement for secure coding practices upstream.
Fastify teams building APIs that need HTTP header security without operational overhead should start with @fastify/helmet; it's a thin wrapper around the battle-tested helmet library, meaning you get OWASP Top 10 mitigations (CSP, HSTS, X-Frame-Options) with minimal configuration beyond `fastify.register()`. The 453 GitHub stars and zero-friction npm install make adoption frictionless for small-to-mid teams. Skip this if you need dynamic policy management, request-level header mutation, or centralized policy enforcement across multiple services; @fastify/helmet is intentionally static and Fastify-bound, not a gateway or orchestration tool.
