Postman

Postman began as a simple Chrome extension designed to help developers send HTTP requests and test API endpoints without writing command-line curl scripts. It has since evolved into a massive, comprehensive API lifecycle platform used by over twenty million developers worldwide. Its primary strength remains its accessibility. A developer can open Postman, paste in an API endpoint, add a bearer token for authorization, and hit "Send" to immediately see the JSON response from the server. This makes debugging incredibly fast. As the software matured, it added the ability to save these requests into "Collections," which act as interactive documentation. Entire engineering teams can share a Postman Collection, ensuring everyone is testing against the exact same API parameters. In recent years, Postman has expanded heavily into automated testing and governance. Developers can write JavaScript tests that execute immediately after an API call finishes, verifying that the response contains the correct data structure. These tests can be integrated into CI/CD pipelines, ensuring that a new code deployment doesn't accidentally break an existing API endpoint.