This series is about integrating Node.js with Drupal 7 using the Node.js Integration contributed module on Drupal.org. The Node.js Integration project contains a number of submodules, and a separate Node.js application written in Javascript, that uses the Express, Socket.io, and Request packages.
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This collection covers a topic in Drupal 7 which may or may not be the version you're using. We're keeping this tutorial online as a courtesy to users of Drupal 7, but we consider it archived.