Playwright API Testing — Beginner to Advanced

Overview

This PDF provides a practical TypeScript handbook for Playwright API testing, covering topics from foundational concepts to advanced framework design. It addresses authentication, storage state, UI+API workflows, reusable clients, test data, negative testing, debugging, and CI/CD. The guide is structured to assist users ranging from beginners in API testing to those seeking to build production-ready frameworks. Each chapter includes simple language, a TypeScript example, a key takeaway, and a hands-on practice task. It helps users understand how Playwright API testing functions in real projects, starting from the initial request through to developing a comprehensive testing framework.

Table of contents

1. What Is API Testing in Playwright?
2. Project Setup for API Testing
3. Using the Built-in request Fixture
4. Sending a GET Request
5. Query Parameters with params
6. Sending a POST Request with JSON
7. Updating a Resource with PUT
8. Partial Updates with PATCH
9. Deleting Resources
10. Request Headers
11. Understanding APIResponse
12. Parsing JSON Safely
13. Strong Assertions for API Tests
14. Response Header Assertions
15. Bearer Token Authentication

Who this resource is for

• API Tester