100 Negative API Test Cases Every QA Should Know
Published by SoftwareTestPilot
PDF • 17 pages • Test Cases • All Levels • API Testing
Published 5 October 2026 • Updated 5 October 2026
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This guide details 100 negative API test cases across 11 categories, structured to help QA, SDET, and API testers prove an API cannot be broken, bypassed, or abused.
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Overview
This guide details 100 negative API test cases across 11 categories, structured to help QA, SDET, and API testers prove an API cannot be broken, bypassed, or abused. It covers what to send, what the API must answer, and how to automate these tests, focusing on achieving a clean 4xx response without 500 errors, data leaks, or changed records. The cases range from authentication and validation to injection and concurrency, with each case prioritized by risk (high, medium, low) for effective test planning. This practical handbook is designed to be automation-ready, supporting data-driven testing with tools like pytest and Postman. It provides guidance on automating the 100 cases, prioritizing, mapping, and reporting findings, and includes interview questions and answers. The content is suitable for professionals looking to enhance their understanding and application of robust negative API testing strategies.
What you'll learn
- Apply 100 negative API test cases.
- Categorize negative test cases by type.
- Prioritize test cases by risk level.
- Automate negative API tests effectively.
- Interpret API negative response codes.
- Identify potential API security flaws.
Topics covered
- manual-testing
Table of contents
- How to Use This Guide
- Category 1: Authentication
- Category 2: Authorization and Access Control
- Category 3: Headers, Methods and Content Type
- Category 4: Path and Query Parameters
- Category 5: JSON Body Structure
- Category 6: Field Validation
- Category 7: Resource State and Business Rules
- Category 8: Pagination, Filtering and Sorting
- Category 9: File Upload
- Category 10: Security and Injection
- Category 11: Rate Limits, Concurrency and Resilience
- Automating the 100 Cases
- Prioritising, Mapping and Reporting
- Interview Questions and Answers
- Quick Reference
Tools covered
- Postman
- SQL
Skills covered
- API Testing
Who this resource is for
- Automation Tester
- SDET
- API Tester
Format and what you get
- A downloadable PDF you can read on phone or laptop.
- Included in the QA Notes Vault: one payment unlocks every note in the Vault, with lifetime access to it.
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