Resizing Images with Node.js

My fun with Node.js continues. Yesterday I put together a script to resize jpegs on-the-fly: imageSize.

As part of my c2bk program I've been revisiting this site and cleaning up pieces that have broken over the years. One of those pieces is a few dozen galleries of photos I posted here between 1999-2005. Before photo-sharing sites existed you had to do it yourself. The photos are small and not very good, but they are part of my history.

I added thumbnails for each gallery to my archive page. The images are small, but they're not thumbnail-sized which made that archive page inefficient to load. Picking those images out one by one and creating thumbnails seemed like a hassle. Even writing a script to do it seemed like it wasn't worth the time involved.

Then I thought, what if I could just specify the image size in the URL and have them automatically be the correct size? That sounded like a job for node.js and CloudFront. Resizing the image was quick work with sharp. It took a bit to get the URL path-parsing working correctly and to add some caching headers to the response, but then it was all set.

By putting this behind CloudFront, the images are generated on-demand when needed but should be served from Amazon's servers most of the time. Might be overkill for some thumbnails on my archive page, but it's a handy thing to have in my toolbox for future blog/photography experimentation.
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