Cloudinary provides a library for simplifying the integration even further, along with Node.js sample code for uploading and transforming images.
You can find sample projects that demonstrate common Cloudinary's usage in Node.js here:
Included two sample projects:
This sample project uploads local and remote images to Cloudinary and generates URLs for applying various image transformations on the uploaded files.
A fully working web application that allows you to uploads photos, maintain a database with references to them, list them with their metadata, and display them using various cloud-based transformations. Image uploading is performed both from the server side and directly from the browser using a jQuery plugin.