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


Is it possible to get the width and height of an image in node.js (on the server side, not the client side)? I need to find the width and height of an image in a node.js library that I'm writing.

9/22/2012 1:21:36 AM

Accepted Answer

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
.size(function (err, size) {
  if (!err) {
    console.log('width = ' + size.width);
    console.log('height = ' + size.height);
1/11/2014 6:45:11 PM

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.

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

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