I’m currently using ex_force for my Salesforce REST API integrations. It’s using an up to date version of Tesla (http client), works with Jason, and I’ve found it pretty straightforward to use. Currently have a separate module for Auth concerns and some basic caching using Cachex for tokens and metadata like record type ids.

I also found chulkilee/ex_force. It’s brand new which I guess is why it didn’t turn up in my initial web search. The code looks well written and tested — think I’m going to give it a try.

I’d also be curious if you were able to integrate with salesforce streaming API.

Based on this discussion ending in April 2019, their aren’t many options. In that thread, they reference two libraries, both of which appear unmaintained. I bet with a week of love, either of those libraries could be made current and be fine.

What was your mileage?