[dsp1234]

In all seriousness, though, it did make my brain tilt about 15 degrees to see the words "JavaScript" and "SDK" next to each other like that.

AWS has two JavaScript SDKs.

https://aws.amazon.com/sdk-for-browser/

https://aws.amazon.com/sdk-for-node-js/

[smarx]

And Dropbox has one for API v1: https://github.com/dropbox/dropbox-js. There will be one for v2 as well.