This project demonstrates end-to-end REST API testing of an e-commerce backend using Postman.

The goal of the project is to simulate the real responsibilities of a QA / Backend Tester including authentication handling, request chaining, CRUD validation, automated assertions, and execution of a full API test suite.

The APIs are tested against the public DummyJSON REST service.

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• Postman
• REST API
• JavaScript (Postman Test Scripts)
• JSON
• GitHub

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• Environment variables & parameterization
• Authentication (JWT token handling)
• Authorization testing (protected endpoints)
• CRUD Operations (Create, Read, Update, Delete)
• Automated response validation
• Status code verification
• Negative testing
• Edge case testing
• Security testing
• JSON Schema validation
• Request chaining (dynamic data passing)
• Collection Runner execution (automation)

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Login using valid credentials and capture access token.

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Token dynamically saved into environment and used to access protected endpoint /auth/me.

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Base URL and token handled using Postman environment variables.

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Fetching records from the backend server.

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Automated test scripts verifying response status and data.

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Creating a new resource via API.

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Updating server data.

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Deleting a record from backend.

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Login with invalid credentials and validation of error response.

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Verification of response JSON structure.

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Unauthorized access blocked (401 response).

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Testing non-existing resources (404 response).

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Execution of complete API suite using Postman Runner.

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1. Clone or download this repository
2. Import collection.json into Postman
3. Import environment.json
4. Select the environment in Postman
5. Run the Login request first
6. Run the complete collection using Collection Runner

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Through this project I learned:

• Real-world API testing workflow
• Handling authorization tokens
• Writing automated API test scripts
• Using environment variables and dynamic data
• Backend validation and error handling
• Running automated API test suites

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Swayam Uniyal

Aspiring QA Engineer | API Testing | Manual Testing | Automation (Learning)