API Testing Cheat Sheet

Published by SoftwareTestPilot

PDF • 48 pages • Cheat Sheet • All Levels • API Testing

Published 9 September 2026 • Updated 28 September 2026

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API Testing Cheat Sheet — practical API Testing notes for software testers, 48 pages.

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Overview

This API Testing Cheat Sheet provides a quick reference for API testing concepts and practices. It covers fundamental HTTP principles, REST, JSON, authentication, status codes, and various testing techniques. The PDF is designed as a desk reference for use when writing API tests, reviewing test cases, debugging failures, or preparing for interviews. Each page in this cheat sheet is a focused reference card, offering practical insights and checklists. It is tool-neutral, with dedicated reference pages for Postman and curl. This resource helps in designing regression suites and understanding API standards, including HTTP semantics (RFC 9110), OpenAPI 3.2.1, and OWASP API Security Top 10 2023.

What you'll learn

Identify HTTP request and response components.
Categorize HTTP methods and status codes.
Distinguish path and query parameters.
Apply positive and negative testing techniques.
Validate API authentication and authorization.
Test pagination, sorting, filtering, and search.
Interpret OpenAPI specifications.

Topics covered

postman
rest-api

HTTP Request Anatomy
HTTP Response Anatomy
Methods - Quick Reference
Status Code Families
Headers - Must Know
Path vs Query Parameters
JSON Quick Reference
Positive Test Checklist
Negative Test Matrix
Boundary Testing
Required Field Matrix
Authentication Quick Reference
OAuth 2.0 Tester Notes
Authorization Matrix
Pagination Cheat Sheet

Skills covered

API Testing

Who this resource is for

API Tester