Using Postman for API Testing

🔧 Using Postman for API Testing

Postman is one of the most popular tools used for testing APIs. It provides a user-friendly interface that allows developers and testers to interact with APIs, inspect responses, and debug issues without writing any code.


✅ What Is Postman?

Postman is a free API client that makes it easy to create, test, and document RESTful APIs. It supports various HTTP methods like GET, POST, PUT, DELETE, and more.


🧪 Why Use Postman for API Testing?

🖥️ No need to write scripts to test APIs


📊 View detailed request and response data


🔄 Easily test multiple endpoints with different data


🧩 Add authentication headers, tokens, and custom parameters


📝 Save and organize requests into collections for reuse


🧪 Automate tests using scripts written in JavaScript


🚀 Basic Steps to Test an API with Postman

Download and Install Postman

Download Postman


Create a New Request


Open Postman


Click "New" → Request


Choose method (e.g., GET, POST) and enter the API URL


Add Headers or Body (If Required)


Use the Headers tab to add content-type or authorization


Use the Body tab to send data (for POST, PUT)


Send the Request


Click the "Send" button


View the response in JSON, XML, or plain text


Analyze the Response


Check the status code (e.g., 200 OK, 404 Not Found)


Inspect the response body, headers, and time taken


💡 Example: Testing a Public API

http

Copy

Edit

GET https://jsonplaceholder.typicode.com/posts/1

Steps:


Method: GET


URL: https://jsonplaceholder.typicode.com/posts/1


Click Send


Response will be a JSON object representing a post


🛠️ Bonus: Writing Tests in Postman

You can write test scripts in Postman using JavaScript. For example:


javascript

Copy

Edit

pm.test("Status code is 200", function () {

    pm.response.to.have.status(200);

});

📚 Conclusion

Postman simplifies API development and testing, whether you're a beginner or an experienced developer. It's an essential tool for anyone working with backend services.

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