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And yet I still can't easily get it to ignore `node_modules` folders.

Please use git (or similar) for code. GitLab even has free private repos for personal projects.

Dropbox is for binary files (like PDF, MSOffice, etc).

Sometimes you just want to share code between computers without committing it.

Does Git have an easy way to share "uncommitted" code that doesn't involve committing it on a branch and rebaseing it later?

I say this as a huge fan of Git, that's one scenario where a Dropbox folder is stronger than Git

Dropbox is for whatever I want to put in it. Including code! Just because I keep my project folders inside of Dropbox doesn't mean i'm not using git.

Syncthing handles this pretty well. Only downside (upside in some cases) is that it's self hosted rather than a service.