This post is the first in the A Node.JS Holiday Season series from the Identity team at Mozilla, who last month delivered the first beta release of Persona. To make Persona, we built a collection tools addressing areas ranging from debugging, to localization, to dependency management, and more. This series of posts will share our learnings and tools with the community, tools which are relevant to anyone building a high availability service with Node.JS. We hope you enjoy the series, and look forward to your thoughts and contributions. We’ll start off with a topic about a nitty-gritty Node.js problem: memory leaks. We present node-memwatch – a library to help discover and isolate memory leaks in Node.