api-testing-postman

REST API testing using Postman with JavaScript test scripts.

• This project provides thorough REST API testing using Postman. It includes functional test cases, automated assertions, and manual validation. The API under test is a demo RESTful service from reqres.in, used here to simulate real-world testing workflows.

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What's Covered

• GET, POST, DELETE requests with real responses
• Status code validations
• Positive and negative test scenarios
• JSON payload validations
• Clean test case documentation (CSV/Excel)
• Optional CLI automation with Newman

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Sample Test Cases

Test Case ID	Endpoint	Method	Input	Expected Code	Validation
TC001	/users	GET	page=2	200	Response includes user data
TC002	/login	POST	Valid email & password	200	Response includes token
TC003	/login	POST	Missing password	400	Error message for missing field
TC004	/user/2	DELETE	Valid user ID	204	No content response
TC005	/user/9999	DELETE	Invalid user ID	404	Error response for non-existing user

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Postman Collection

The Postman Collection contains:

• GET List Users
• POST Login (Success & Failure)
• DELETE User (Valid & Invalid ID)

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Sample Postman Tests

You can add these under the Tests tab of each request:

```JavaScript

pm.test("Status code is 200", function () {
	pm.response.to.have.status(200);
});

pm.test("Response includes userId", function () {
	let jsonData = pm.response.json();
	pm.expect(jsonData).to.have.property("userId");
});

````

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Tools Used

• Postman
• Swagger/OpenAPI
• JavaScript (for assertions)
• Excel (manual test design)
• reqres.in (mock API)
• Optional: Newman for CLI execution

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Run Collection with Newman (Optional)

To run this collection via CLI:

	newman run Sample_Postman_API_Collection.json

To include an environment file:

	newman run Sample_Postman_API_Collection.json -e your_environment.json

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Requirements

• Postman (GUI)
• Newman (optional CLI)
• Node.js (for Newman)
• Excel/LibreOffice (to view .xlsx and .csv)

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Author

*Nisha Kazmi QA Engineer | Manual + Automation API Testing

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