How to Send Different Types of Requests (GET, POST, PUT, DELETE) in Postman
Postman is one of the most widely used tools for testing, developing, and debugging APIs. Whether you are a beginner learning API concepts or an intermediate developer working with RESTful services, understanding how to send different types of requests in Postman is a crucial skill.
This comprehensive guide explains how to send GET, POST, PUT, and DELETE requests in Postman using real-world examples, practical use cases, and detailed explanations. By the end of this article, you will confidently test APIs using Postman and understand how each HTTP method works.
What Is Postman and Why Is It Used?
Postman is an API client that allows developers and testers to interact with APIs without writing complex frontend or backend code. It provides an intuitive interface to send HTTP requests and analyze responses.
Common Use Cases of Postman
- Testing REST APIs during development
- Debugging backend services
- Validating API responses and status codes
- Automating API testing workflows
- Collaborating with teams using shared collections
Understanding HTTP Request Methods
HTTP methods define the action you want to perform on a server resource. In REST APIs, the most commonly used methods are GET, POST, PUT, and DELETE.
| HTTP Method |
Purpose |
Example Use Case |
| GET |
Retrieve data |
Fetch user details |
| POST |
Create new data |
Add a new user |
| PUT |
Update existing data |
Update user profile |
| DELETE |
Remove data |
Delete a user account |
How to Send a GET Request in Postman
A GET request is used to retrieve data from a server. It does not modify any data and is considered a safe and idempotent operation.
Real-World Example of GET Request
Fetching a list of users from an API.
GET https://jsonplaceholder.typicode.com/users
Steps to Send a GET Request in Postman
- Open Postman and create a new request
- Select the GET method
- Enter the API endpoint URL
- Click the Send button
The response will appear in JSON format, containing user data returned by the server.
How to Send a POST Request in Postman
A POST request is used to send data to the server to create a new resource. It usually includes a request body.
Real-World Example of POST Request
Creating a new user in the system.
POST https://jsonplaceholder.typicode.com/users
Sample Request Body
{
"name": "John Doe",
"email": "john@example.com",
"role": "admin"
}
Steps to Send a POST Request in Postman
- Select POST as the HTTP method
- Enter the API URL
- Go to the Body tab and choose raw
- Select JSON format
- Enter the request payload
- Click Send
How to Send a PUT Request in Postman
A PUT request is used to update an existing resource. It replaces the entire resource with the provided data.
Real-World Example of PUT Request
Updating user information.
PUT https://jsonplaceholder.typicode.com/users/1
Sample Request Body
{
"name": "John Updated",
"email": "john.updated@example.com"
}
When to Use PUT
- Updating complete records
- Ensuring data consistency
- Replacing existing resources
How to Send a DELETE Request in Postman
A DELETE request removes a specific resource from the server.
Real-World Example of DELETE Request
Deleting a user account.
DELETE https://jsonplaceholder.typicode.com/users/1
Key Points About DELETE Requests
- No request body is usually required
- Returns a status code confirming deletion
- Used carefully in production environments
Working with Headers, Params, and Authorization in Postman
Headers
Headers provide metadata such as content type and authentication tokens.
Content-Type: application/json
Authorization: Bearer your_token_here
Query Parameters
Used to filter or modify GET requests.
GET /users?role=admin
Common Errors While Sending Requests in Postman
- Incorrect HTTP method selection
- Missing headers
- Invalid JSON format
- Authorization issues
Understanding how to send GET, POST, PUT, and DELETE requests in Postman is essential for anyone working with APIs. Postman simplifies API testing by providing an intuitive interface, real-time responses, and powerful testing features. By mastering these HTTP methods, you can efficiently test, debug, and validate RESTful APIs in real-world applications.
Frequently Asked Questions (FAQs)
1. What is the difference between POST and PUT in Postman?
POST is used to create new resources, while PUT is used to update or replace existing resources.
2. Can I send multiple requests in Postman?
Yes, you can organize multiple requests using collections and run them sequentially using the Collection Runner.
3. Is Postman only for developers?
No, Postman is widely used by testers, QA engineers, and even product teams for API validation.
4. How do I handle authentication in Postman?
Postman supports multiple authentication types such as API keys, Bearer tokens, OAuth 2.0, and Basic Auth.
5. Can Postman be used for automated testing?
Yes, Postman allows writing test scripts using JavaScript and integrating with CI/CD pipelines.
