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In this 4th instalment of my NodeJS Performance Optimizations series, I show you how to test the availability of your API Server. The tool I’ll be using for my tests is called AutoCannon. It’s written entirely in NodeJS and is very similar to Apache Benchmark, Artillery, K6, Wrk, etc. This is good news because you are not forced to use it to follow along with this article. Most of the theory and principles mentioned can apply to any platform and environment.