u/kernelangus420

How strictly should I avoid a Node/Express handler returning a value to the client, but have some process continue in the background to finish processing it?

If the background is expected to take another 1~2 seconds is it acceptable?

Or should I avoid them and relegate all background tasks, big or small, to a dedicated job queue at the cost of complexity.

Client side image resizing is simple (uses Canvas and toBlob) and saves bandwidth, why aren't more people doing it?

Advantages:

• Naturally supports all the image formats that the device's camera supports (e.g HEIC) and converts it to universal PNG or WEBP.
• Resizes the image to smaller size which saves bandwidth.
• Bonus: Create multiple image sizes too and upload all of them so you don't have to do it on the server.
• If you're doing it anyway, might as well support client cropping and rotating.

Disadvantages:

• More code on the client app, although handing canvas is really small since most of it is done natively
• You loose the EXIF data unless you process it specifically
• If you do resize to multiple sizes and upload separately you use more bandwidth and you have to trust the uploader didn't fudge the different dimensions
• Doesn't support old browsers