I have given here a small demo on how to create image thumbnail using jimp - a java script image manipulator library. i have used nodeJs for this simple demo.

JIMP npm package can be found below link
https://github.com/abrly/NodeJSThumbn...

Sample code can be downloaded from my gitHub link below
https://github.com/abrly/NodeJSThumbn...

nodejs demo
npm
thumbnail creation
fileupload