I’ve been a Postman user for my entire developer career. I remember when it was just a simple Chrome extension that made pentesting APIs slightly less painful. Those were simpler times. Today, I find myself joining the growing exodus of developers abandoning these tools because they sell out.
Go back to the future:
https://addons.mozilla.org/en-US/firefox/addon/rester/
I also use Bruno: https://github.com/usebruno/bruno