How do you perform API testing using Postman?

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Common testing tools in software testing are used to ensure the quality, reliability, and performance of applications. These tools support various testing types such as unit testing, integration testing, functional testing, performance testing, and more.

API testing using Postman is a common and powerful method for verifying that your APIs are functioning as expected. Here’s a general step-by-step guide to help you perform API testing with Postman:

1. Install and Launch Postman

• Download and install Postman from here.

• After installation, launch Postman.

2. Create a New Request

• Open Postman and click on the "New" button in the top left corner.

• Select "Request" from the options.

• You can either create a new collection or add the request to an existing collection.

• Give the request a name and choose the collection where you want to save it.

• Click "Save".

3. Set Up the Request

• In the request window, you’ll need to configure the details of the request:

  • HTTP Method: Choose the HTTP method (e.g., GET, POST, PUT, DELETE) based on what you are testing.

  • URL: Enter the full endpoint URL for the API you want to test (e.g., https://api.example.com/v1/resource).

4. Add Request Parameters or Body

• If your request requires query parameters, headers, or a body (for POST, PUT, etc.):

  • Params: Add any query parameters by clicking the Params tab under the URL.

  • Headers: You can add headers (e.g., Content-Type, Authorization) by clicking the Headers tab.

  • Body: For POST, PUT, and PATCH requests, use the Body tab to include the data you want to send in the request.

    • Select raw or form-data, depending on the type of data you're sending.

5. Send the Request

• After setting up the request, click the "Send" button to execute the API request.

• Postman will display the response from the server below, including:

  • Response status (e.g., 200 OK, 404 Not Found, etc.)

  • Response time

  • Response body (usually in JSON, XML, or HTML format)

  • Response headers

6. Validate the Response

• You can now check the response against the expected result.

• Look for:

  • Status Code: Ensure it matches the expected status code for the request (e.g., 200 for success, 404 for not found).

  • Response Body: Ensure the response body contains the expected data or structure.

  • Response Time: Verify the response time is within acceptable limits.

Postman also provides automatic validation in the form of tests. You can write tests in the Tests tab.

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