How do you test APIs using Postman?

Best Full Stack Java Training Institute in Hyderabad with Live Internship Program

Are you aiming to build a strong foundation in software development and land your dream job in the IT industry? Look no further than Quality Thought, the best Full Stack Java training institute in Hyderabad, known for its industry-focused training and valuable live internship program.

Quality Thought’s Full Stack Java course is designed for both beginners and professionals who want to master the skills required to develop real-world web applications. The course covers everything from Core Java, Advanced Java, JDBC, Servlets, JSP, Spring, Spring Boot, Hibernate, to front-end technologies like HTML, CSS, JavaScript, Bootstrap, Angular, and React.

What makes this training truly effective is the live internship, which provides hands-on experience on real-time projects. Students work in a simulated industry environment, dealing with actual coding tasks, debugging, deployment, version control, and team collaboration. This practical exposure helps learners build confidence and problem-solving skills—critical assets in any software job.

Program Highlights:

Comprehensive Full Stack Java Curriculum

Real-Time Projects with Live Internship

Mentorship from Industry Experts

Daily Practice, Assignments & Project Work

Resume Preparation, Mock Interviews & Placement Assistance

Internship Certificate & Career Guidance

Whether you're a fresher just out of college or a working professional planning a career switch, Quality Thought offers the best platform to become a skilled Full Stack Java Developer. With a focus on practical learning and job readiness, many of our students are now placed in top IT companies across India.

Join Quality Thought today – Get trained, get certified, gain real-world experience, and step confidently into the IT industry!

🔹 How to Test APIs using Postman

1. Install & Open Postman

• Download Postman (desktop app or web version).

• Create a new Request in a Collection to organize your tests.

2. Enter the API Endpoint (URL)

• Paste the API URL (e.g., https://api.example.com/users).

• Choose the HTTP method:

  • GET → Fetch data

  • POST → Send new data

  • PUT / PATCH → Update data

  • DELETE → Remove data

3. Set Headers (if required)

• Many APIs need headers like:

  • Content-Type: application/json

  • Authorization: Bearer <token> (for secure APIs)

4. Add Request Body (for POST/PUT/PATCH)

• Go to Body → choose raw → select JSON.

• Example:

{
  "name": "John Doe",
  "email": "john@example.com"
}

5. Send the Request

• Click Send button.

• Postman shows:

  • Status code (200 OK, 201 Created, 400 Bad Request, 401 Unauthorized, etc.)

  • Response body (JSON, XML, or HTML)

  • Response time & size

6. Validate the Response

• Check:

  • Correct status code

  • Proper response data (fields, values, types)

  • Performance (response time)

7. Write Test Scripts (Automation)

• Postman allows JavaScript-based test scripts in the Tests tab.

• Example test:

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

pm.test("Response has user id", function () {
    var jsonData = pm.response.json();
    pm.expect(jsonData).to.have.property("id");
});

👉 These tests run automatically every time you hit Send.

8. Use Collections & Environments

• Collections → Group related API requests.

• Environments → Store variables like {{baseUrl}}, {{token}}.

  • Example: Instead of writing https://dev.example.com, use {{baseUrl}}.

  • Switch environments (Dev, QA, Prod) easily.

9. Run Automated Tests with Collection Runner

• Use Collection Runner to execute multiple requests with tests in sequence.

• Great for regression or smoke testing APIs.

10. Advanced: Newman for CI/CD

• Newman = Postman’s CLI tool.

• Lets you integrate Postman tests into Jenkins, GitHub Actions, or CI/CD pipelines.

✅ In short:

To test APIs in Postman, you create requests, set headers/body, hit Send, validate status codes & responses, and optionally automate with scripts & collections.

Read more :

What is a POM file?

What is Maven?

Visit  Quality Thought Training Institute in Hyderabad