Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Automate API workflows. Chain HTTP requests. Validate. Zero code.

Real API Design-first Development Platform Design. Debug. Test. Document. Mock. Build APIs Faster & Together.

The world’s first API testing platform that auto-generates unit test cases with dependency mocks from API calls. Using advanced AI, it simplifies test creation, debugging, and evolution, ensuring comprehensive coverage and boosting software quality.

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.

Burp or Burp Suite is a set of tools used for penetration testing of web applications. It is developed by a company named Portswigger who make freely available a Web Security Academy which has a range of lessons on penetration testing.