Get the width and height of an image in node.js

Installing GraphicsMagick or ImageMagick isn't at all needed, determining the dimensions of a image is as easy as looking at the header. image-size is a pure javascript implementation of said feature which is very easy to use.

https://github.com/netroy/image-size

var sizeOf = require('image-size');
sizeOf('images/funny-cats.png', function (err, dimensions) {
  console.log(dimensions.width, dimensions.height);
});

Yes this is possible but you will need to install GraphicsMagick or ImageMagick.

I have used both and I can recommend GraphicsMagick it's lot faster.

Once you have installed both the program and it's module you would do something like this to get the width and height.

gm = require('gm');

// obtain the size of an image
gm('test.jpg')
.size(function (err, size) {
  if (!err) {
    console.log('width = ' + size.width);
    console.log('height = ' + size.height);
  }
});