Is it possible to create and update custom objects using rest? I seen different questions that suggest it isn't yet available without using a client or SOAP but I need to be able to access it through http calls alone. (I know I can probably do it for soap but I'm attempting to make it as least complicated for me as possible).
Based on the discussions in the comments, you have two requests here:
- To create custom objects using API/UI
- To create records within those custom objects
You can achieve these using the different APIs available.
The links in the answer should help you get started.