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Creating and Testing APIs with Swagger

Mar 11, 2025

Lecture on Creating and Testing APIs with Swagger and ChatGPT

Introduction

  • Objective: Learn to create API server and test APIs using Swagger with the help of ChatGPT.
  • Audience: QA Engineers, Software Developers, and Engineers.
  • Presenter: Sergi Kenko, Founder of Kodify QA Boot Camp.

Tools and Technologies

  • ChatGPT: Used for assistance in creating the API server.
  • Node.js: Platform for running JavaScript on the server-side.
  • Swagger: Tool for API documentation and testing.
  • Visual Studio Code (VS Code): IDE used for coding.

Setting Up the Environment

  1. Register and Log in to ChatGPT
    • Use either free version (3.5) or paid version (4).
  2. Download and Set Up VS Code
    • Available for Windows and Mac.

Steps to Create an API Server

  1. Initialize the Project
    • Use npm init -y to create a package.json file.
  2. Install Dependencies
    • Express: Framework for running the API server.
    • Swagger UI Express: For Swagger UI.
    • YAML JS: To work with YAML file format.
  3. Create Server File
    • File: server.js
    • Contains code for running the backend server.
  4. Set Up Swagger Documentation
    • File: swagger.yaml
    • Used for defining API documentation in YAML.
  5. Update Server File
    • Integrate Swagger UI into the server.

CRUD Operations with Swagger

  • CRUD: Create, Read, Update, Delete operations.
  • Endpoints:
    • GET: Retrieve data (localhost:port/items).
    • POST: Add new data.
    • PUT: Update existing data.
    • DELETE: Remove data.

Testing APIs with Swagger

  1. POST Request
    • Add items with a name and automatically generated ID.
  2. GET Request
    • Retrieve all items to verify additions/modifications.
  3. PUT Request
    • Update item details using the ID.
  4. DELETE Request
    • Remove items by ID.
  5. Error Handling
    • Check for not found items with distinct responses.

Explanation of Key Concepts

  • Ports: Specify different ports for running multiple servers.
  • YAML: Configuration language used for writing Swagger documentation.
  • Testing with Swagger: Validate API operations and responses.

Conclusion

  • Encouragement: Like, comment, and share the video.
  • Additional Learning: Links for further courses provided.