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@fastify/rate-limit is a free api security tool. Source Defense How it works is a commercial api security tool by Source Defense. Compare features, ratings, integrations, and community reviews side by side to find the best api security fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Teams building Node.js APIs who need rate limiting without the operational overhead of a separate service should reach for @fastify/rate-limit. The plugin ships as a native Fastify middleware with sub-millisecond latency overhead, making it practical for high-throughput routes where traditional gateway-level rate limiting adds unacceptable latency. Not for buyers who need distributed rate limiting across multiple instances without in-memory state coordination or those who require sophisticated quota management beyond simple request-per-window rules.
Mid-market and enterprise security teams managing high-risk third-party vendor ecosystems should use Source Defense How it works for its two-line code deployment against Magecart and formjacking attacks that traditional WAFs miss entirely. The agentless SaaS model deploys in hours rather than weeks, and the machine learning-based access control actually enforces least-privilege vendor permissions at the client side, which maps directly to GV.SC supply chain controls. This tool prioritizes real-time prevention over forensics, so organizations needing deep historical breach analysis or incident response workflows should look elsewhere.
Client-side security for websites against 3rd party vendor attacks
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Common questions about comparing @fastify/rate-limit vs Source Defense How it works for your api security needs.
@fastify/rate-limit: A low overhead rate limiter for your routes..
Source Defense How it works: Client-side security for websites against 3rd party vendor attacks. built by Source Defense. headquartered in Israel. Core capabilities include Real-time sandbox isolation technology, Protection against Magecart and Formjacking attacks, Automated and dynamic policy configuration..
Both serve the API Security market but differ in approach, feature depth, and target audience.
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