Master Postman: Install, Configure, and Debug APIs Like a Pro

Postman is an API debugging tool that makes testing easy and allows backend developers to export results for frontend debugging.

Installation

Download from https://www.getpostman.com/downloads/.

Run the installer by double‑clicking the package.

Settings

Theme

Postman offers a light and a dark theme, accessible via File → Settings.

Adjust Font Size

Use the Zoom In and Zoom Out buttons under View to change the font size, especially on large screens.

API Debugging

Test interfaces are from the mall‑admin backend; start it and test directly.

GET Request

POST Request with JSON

POST Request with Form Data

File Upload

Authenticated Requests

Login to Get Token

Set Token Header and Call Protected API

Import/Export Collections

Save Debug Information

Export Collection

Import Collection

Tips

Set Different Environments

Define multiple environment variables (e.g., local and test) and reference them in request URLs to avoid hard‑coding host addresses.

Add Local Environment

Add Test Environment

Reference Environment Variable

Switch Environments

Set Global Login Token

Define a token once and reference it across requests; when the token expires, update it in a single place.