Cypress

Cypress is a test automation framework for testing Web Applications. It is implemented in Javascript and part of the framework runs inside the same browser where the application under test is being executed. Cypress executes your test scripts inside that same browser too. That architecture gives Cypress a lot of power for interacting with the pages of the application and puts it into a position to interact with backend API calls as well. It also means all your test scripts are written in Javascript.

Image: Aleksey Boev, CC-BY-SA 3.0