Postman

Postman is an API development platform for designing, testing, documenting, and monitoring APIs. It provides a graphical interface for constructing HTTP requests, inspecting responses, and organizing related requests into collections that can be shared across teams. The platform supports REST, GraphQL, WebSocket, gRPC, and SOAP protocols.

Beyond manual request testing, Postman supports automated test scripts written in JavaScript that validate response status codes, body content, headers, and response times. Collections can be run sequentially with dynamic variables, enabling end-to-end API workflow testing. Mock servers simulate API responses before the backend is built, allowing frontend development to proceed in parallel. The documentation feature auto-generates API reference pages from collections.

For web development teams, Postman is valuable throughout the API lifecycle. During development, it provides quick feedback for testing endpoints. During integration, shared collections ensure frontend and backend teams agree on request and response formats. In production, monitors can run collections on a schedule to detect regressions and outages. While alternatives like Insomnia and command-line tools like curl and httpie exist, Postman's combination of visual interface, automation, and team collaboration features makes it the most widely adopted API testing tool.