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Rest APIprogramming~5 mins

Why REST APIs exist

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Introduction

REST APIs exist to help different computer programs talk to each other easily over the internet. They make sharing data and actions simple and organized.

When you want a mobile app to get data from a website's server.
When different software systems need to work together and share information.
When you want to let other developers use your service or data safely.
When you want to separate the user interface from the data handling on the server.
When you want to build scalable and easy-to-maintain web services.
Syntax
Rest API
REST API is not a code syntax but a style. It uses HTTP methods like GET, POST, PUT, DELETE to perform actions on resources identified by URLs.

REST stands for Representational State Transfer.

It uses standard web protocols, so it works well with browsers and servers.

Examples
Get information about the user with ID 123.
Rest API
GET /users/123
Create a new user named Alice by sending data to the server.
Rest API
POST /users
{
  "name": "Alice",
  "email": "alice@example.com"
}
Update the email of user 123.
Rest API
PUT /users/123
{
  "email": "newemail@example.com"
}
Remove the user with ID 123 from the system.
Rest API
DELETE /users/123
Sample Program

This Python program uses a REST API to get user information from a public test service. It prints the user's name if successful.

Rest API
import requests

# Get user data from a REST API
response = requests.get('https://jsonplaceholder.typicode.com/users/1')

if response.status_code == 200:
    user = response.json()
    print(f"User name: {user['name']}")
else:
    print("Failed to get user data")
OutputSuccess
Important Notes

REST APIs use simple URLs and HTTP methods, making them easy to understand and use.

They help keep the client (like a web or mobile app) and server separate, so each can change independently.

Using REST APIs allows many different devices and programs to work together smoothly.

Summary

REST APIs let programs communicate over the internet using simple rules.

They use HTTP methods to work with data resources identified by URLs.

This makes building and connecting apps easier and more flexible.