Practice Exercise 1: API CRUD Operations using Postman and cURL

Objective

Perform CRUD operations on a JSONPlaceholder API.

Prerequisites

Postman: Make sure you have Postman installed on your computer. You can download it from https://www.postman.com/.
cURL: cURL is a command-line tool for making HTTP requests. You can install it if it's not already on your system. You can find installation instructions at https://curl.se/download.html.

Exercises

In this exercise, you'll perform CRUD operations on the JSONPlaceholder API using both Postman and cURL. You'll interact with a set of fake data representing users.

Exercise 1: Create (POST)

Postman:

Open Postman.
Create a new request and set the request type to POST.
Set the request URL to https://jsonplaceholder.typicode.com/users.
In the request body, select "Raw" and choose "JSON (application/json)" as the format.
Provide a JSON object representing a new user.

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

- Click the "Send" button to create a new user.

cURL: - Open your terminal. - Run the following cURL command to create a new user:

curl -X POST -H "Content-Type: application/json" -d '{
    "name": "John Doe",
    "username": "johndoe",
    "email": "johndoe@example.com"
}' https://jsonplaceholder.typicode.com/users

Exercise 2: READ (GET)

Postman: - Create a new request in Postman and set the request type to GET. - Set the request URL to https://jsonplaceholder.typicode.com/users. - Click the "Send" button to retrieve a list of users.

cURL: - Run the following cURL command to retrieve a list of users:

curl https://jsonplaceholder.typicode.com/users

Exercise 3: Update (PUT)

Postman: - Create a new request in Postman and set the request type to PUT. - Set the request URL to https://jsonplaceholder.typicode.com/users/1 to update the user with ID 1. - In the request body, select "Raw" and choose "JSON (application/json)" as the format. - Provide the updated user data.

{
    "name": "Updated John Doe",
    "username": "updatedjohndoe",
    "email": "updatedjohndoe@example.com"
}

cURL:

Run the following cURL command to update the user with ID 1:

curl -X PUT -H "Content-Type: application/json" -d '{
    "name": "Updated John Doe",
    "username": "updatedjohndoe",
    "email": "updatedjohndoe@example.com"
}' https://jsonplaceholder.typicode.com/users/1

Exercise 4: Delete (DELETE)

Postman:

Create a new request in Postman and set the request type to DELETE.
Set the request URL to https://jsonplaceholder.typicode.com/users/1 to delete the user with ID 1.
Click the "Send" button to delete the user.

cURL:

Run the following cURL command to delete the user with ID 1:

curl -X DELETE https://jsonplaceholder.typicode.com/users/1

Conclusion

These exercises will help you practice basic CRUD operations using Postman and cURL with the JSONPlaceholder API. You can adapt them to other APIs as well.