Postman
Postman is a popular API development and testing platform that lets developers design, document, test, and debug HTTP APIs through a graphical interface and collaborative workspace.
Definition
Postman is a popular API development and testing platform that lets developers design, document, test, and debug HTTP APIs through a graphical interface and collaborative workspace.
Overview
Postman began as a browser extension for sending HTTP requests and has grown into a full API platform used across the software development lifecycle: designing endpoints, writing automated test scripts, mocking servers before a backend exists, monitoring live APIs, and documenting them for other developers to consume. Its request builder lets developers construct and send HTTP requests with custom headers, authentication, and body payloads, then inspect responses without writing any client code. Collections — organized, shareable groups of API requests — are central to how teams use Postman, letting developers save common requests, environment variables, and automated test assertions (written in JavaScript) that run against every request in a collection. These collections can be exported and version-controlled, or generated automatically from an OpenAPI specification, bridging the gap between API design documents and hands-on testing. Postman is widely used alongside frameworks like Express.js or FastAPI during backend development, and is frequently compared to lighter-weight alternatives like Insomnia. Its collaborative workspace features — shared collections, comments, and team environments — have made it a standard tool for API-first teams coordinating frontend and backend development.
Key Features
- Graphical request builder for sending and inspecting HTTP requests
- Collections for organizing and sharing groups of API requests
- Automated test scripting in JavaScript for validating responses
- Environment variables for testing across dev, staging, and production
- Mock servers for testing against an API before the backend is built
- API monitoring for tracking uptime and performance over time
- Import/export support for OpenAPI and other API specification formats
- Team workspaces for collaborative API development