For many years, Postman was a tool of choice for me when testing APIs while in development. It was a quick way to construct HTTP requests of any type and probe responses, test auth, things of that nature. It made quick work of figuring out how to design consumers, client wrappers and objects in Drupal to work with data structures from APIs.
However over the years Postman took some odd turns that makes it largely unusable for me, especially on Linux. The experience is clunky and awkward, and always requires signing in and several steps just to get to a point to start testing.
Thats when I discovered Bruno.
Bruno is a simple, offline-first desktop application for testing APIs with most of the same features as Postman.
I recently used it on a client finserv project that connected to various internal systems via an API and make it easy to test out requests and responses and fit them into Drupal and then test Drupal against the same API wrappers in custom modules. I can't say enough postitive things about Bruno and while JetBrains IDEs have an HTTP client, Bruno is just easier to use.