Inspiring by carrierwave on Rails. I wrote a image processing framework to handle images with different versions on node.js and express. Integrate with node-imagemagick and can upload image to Amazon S3. It is just a simple version of carrierwave with similiar Api. But I am comfortable with the features, which is enough for my requirement right now. I will try to improve the image processing efficiency, and add more processing options for future usage.
You can check this project on Github