Postman

Postman is a comprehensive, cross-platform application that provides developers with a set of powerful yet fairly accessible tools for sharing, testing, documenting and monitoring APIs, basically covering the full spectrum of API development.

Originally available only as a Google Chrome extension, you should know that this utility can now be deployed and run just as efficiently on all major OSes out there, thanks to its smooth-running and easy to install Windows, macOS, and Linux clients. This said, getting started with Postman requires you to undergo a hassle-free installation process, followed by a quick log-in procedure. You can use your official Postman credentials or create an account in practically no time using an existing Google account as a starting point. The utility boasts an intuitive interface with support for two themes, one more suited for very-well lit work environments while the other for darker rooms.

Construct requests and read responses, track changes within APIs, and take advantage of a multitude of collections and environments for testing and sharing APIs. If you go for the paid versions, dubbed Postman Pro and Postman Enterprise, you get some neat collaboration features besides the advanced monitoring security and administration-orientated tools. This allows you and your team to develop API within a unified and distraction-free environment.

With all that in mind, it is no wonder that Postman has gained so much popularity since it was first launched as a Chrome addon, as it makes the process of thoroughly testing, documenting and sharing APIs almost effortless. Postman is definitely a must-have (or at least a must-try) for every developer who regularly works with APIs for their web- or mobile-based projects.