@fastify/helmet vs Source Defense How it works: side-by-side comparison (2026)

@fastify/helmet: A Fastify plugin that implements HTTP security headers through a wrapper around the helmet library to protect web applications from common vulnerabilities.

Source Defense How it works: Client-side security for websites against 3rd party vendor attacks. Built by Source Defense.

The table above shows where their features, integrations, deployment and company size fit differ.

@fastify/helmet is open-source with 453 GitHub stars. Source Defense How it works is made by Source Defense. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. @fastify/helmet and Source Defense How it works are both Runtime Application Self-Protection products, and both cover Web Security. Key differences: @fastify/helmet is Free while Source Defense How it works is Commercial, @fastify/helmet is open-source. Use the table above to see where features, deployment and company size fit differ.