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AI Powered Full Stack Testing Course in Telugu: How to Learn Postman and REST Assured

Author : chandra sekhar | Published On : 13 Oct 2026

API testing is an important part of modern quality assurance because applications depend on backend services to exchange data. Two commonly used options for API testing are Postman and REST Assured. Postman supports visual, interactive API testing, while REST Assured is a Java library used to write automated tests for REST APIs.

An AI Powered Full Stack Testing Course in Telugu can help beginners understand these tools and learn when to use each one in real-world testing projects.

What Is Postman?

Postman is an API platform that allows testers to send HTTP requests and inspect responses through a graphical interface. It is useful for learning API concepts without writing a complete automation framework.

With Postman, testers can:

  • Send GET, POST, PUT, PATCH, and DELETE requests.

  • Add query parameters, headers, and request bodies.

  • Inspect response status codes and JSON data.

  • Save requests in collections.

  • Create basic automated checks using scripts.

  • Run collections to repeat API tests.

For example, a tester can send a GET request to a course API and verify whether the response contains the expected course name and course ID.

How to Learn Postman Step by Step

Start with a practice API and follow a structured approach.

Step 1: Understand HTTP methods. Learn the purpose of GET, POST, PUT, PATCH, and DELETE.

Step 2: Send your first request. Enter an authorised test endpoint and inspect the response.

Step 3: Work with JSON. Learn to identify objects, arrays, keys, and values in API responses.

Step 4: Validate results. Check status codes and required response fields. Write simple test scripts when ready.

Step 5: Use collections and environments. Organise related requests and separate configuration values such as base URLs.

Step 6: Practise negative scenarios. Test missing parameters, invalid inputs, and unauthorised requests using a safe test environment.

This approach helps beginners move from individual API requests to organised test suites.

What Is REST Assured?

REST Assured is a Java library that supports automated testing of REST APIs. It allows testers to send requests and validate responses using readable, code-based assertions.

REST Assured is particularly useful when a team wants API tests to run as part of a Java automation framework or CI/CD pipeline.

A simple example is:

import static io.restassured.RestAssured.*;

import static org.hamcrest.Matchers.*;

 

public class ApiTest {

    public static void main(String[] args) {

        given()

        .when()

            .get("https://example.com/api/courses")

        .then()

            .statusCode(200)

            .body("size()", greaterThan(0));

    }

}

This is an illustrative example. Replace the sample endpoint with a suitable test API and adjust the response assertion to match its actual structure. The required REST Assured and Hamcrest dependencies must also be configured in the Java project.

How to Learn REST Assured

Before learning REST Assured, understand Java basics, including variables, methods, classes, collections, and exception handling. Familiarity with Maven or Gradle is also helpful.

Then follow these steps:

  1. Set up a Java project and add the REST Assured dependency.

  2. Send GET and POST requests.

  3. Validate status codes and response bodies.

  4. Add request headers, parameters, and authentication.

  5. Use reusable methods and test data.

  6. Integrate tests with a testing framework such as TestNG or JUnit.

  7. Run automated tests through a CI tool when the basics are clear.

Postman vs REST Assured: What Is the Difference?

Postman is often a convenient starting point for exploratory API testing and manual request validation. REST Assured is suitable when teams want API tests written in Java and integrated with code-based automation frameworks.

They are not necessarily competing choices. Testers can use Postman to understand an API and REST Assured to automate repeatable checks.

How Can AI Help You Learn These Tools?

AI assistants can explain API responses, suggest test cases, and help troubleshoot scripts. They may also provide examples of assertions for common scenarios.

Review generated code carefully, verify endpoint behaviour, and avoid sharing confidential credentials or sensitive production data with unapproved AI systems.

Frequently Asked Questions

1. Should beginners learn Postman first?

Postman is often a practical starting point because its visual interface helps learners understand requests and responses.

2. Is Java required for REST Assured?

Yes. Since REST Assured is a Java library, Java fundamentals are important for writing and maintaining tests.

3. Can Postman support automation?

Yes. Postman supports test scripts and collection runs, enabling teams to automate API checks.

4. Can both tools be included in one testing project?

Yes. A team can use Postman for exploratory testing and REST Assured for automated API regression tests.

Conclusion

Learning Postman and REST Assured helps aspiring QA engineers develop both interactive and code-based API testing skills. Start with HTTP concepts and JSON, practise requests in Postman, and progress to Java automation with REST Assured. An AI Powered Full Stack Testing Course in Telugu can provide a structured pathway for building these skills through practical projects.