Client credentials flow in Rest API - Mini Project: Build & Apply

Client Credentials Flow with REST API

📖 Scenario: You are building a simple program to get an access token from an API using the client credentials flow. This flow is used when your application needs to authenticate itself (not a user) to get access to protected resources.Imagine you have a client ID and client secret from the API provider. You will send these to the token endpoint to get an access token.

🎯 Goal: Build a program that sends a POST request to the token endpoint with client credentials, receives the access token, and prints it.

📋 What You'll Learn

Create variables for client_id and client_secret with exact values.

Create a variable token_url with the exact token endpoint URL.

Send a POST request with client_id and client_secret as form data.

Extract the access_token from the JSON response.

Print the access_token.

💡 Why This Matters

🌍 Real World

Many applications need to authenticate themselves to APIs without user interaction. The client credentials flow is a common way to get access tokens for such server-to-server communication.

💼 Career

Understanding how to implement OAuth2 client credentials flow is important for backend developers, API integrators, and anyone working with secure API authentication.

1

Set up client credentials and token URL

Create variables called client_id and client_secret with these exact values: "my_client_id_123" and "my_secret_456". Also create a variable called token_url with the exact value "https://api.example.com/oauth2/token".

Rest API

# Create client_id, client_secret, and token_url variables
# Your code here

Need a hint?

Use simple assignment to create the three variables with the exact strings.

2

Prepare the data for the POST request

Create a dictionary called data with keys grant_type, client_id, and client_secret. Set grant_type to "client_credentials", and use the variables client_id and client_secret for the other two keys.

Rest API

client_id = "my_client_id_123"
client_secret = "my_secret_456"
token_url = "https://api.example.com/oauth2/token"

# Create a dictionary called data with grant_type, client_id, and client_secret
# Your code here

Need a hint?

Create a dictionary with the exact keys and values as described.

3

Send POST request and get access token

Import the requests library. Use requests.post to send a POST request to token_url with data as form data. Save the JSON response in a variable called response_json. Extract the access_token from response_json and save it in a variable called access_token.

Rest API

client_id = "my_client_id_123"
client_secret = "my_secret_456"
token_url = "https://api.example.com/oauth2/token"

data = {
    "grant_type": "client_credentials",
    "client_id": client_id,
    "client_secret": client_secret
}

# Import requests and send POST request to token_url with data
# Get JSON response and extract access_token
# Your code here

Need a hint?

Use requests.post with data=data. Then call .json() on the response. Finally, get the access_token from the JSON.

4

Print the access token

Write a print statement to display the access_token variable.

Rest API

import requests

client_id = "my_client_id_123"
client_secret = "my_secret_456"
token_url = "https://api.example.com/oauth2/token"

data = {
    "grant_type": "client_credentials",
    "client_id": client_id,
    "client_secret": client_secret
}

response = requests.post(token_url, data=data)
response_json = response.json()
access_token = response_json["access_token"]

# Print the access_token
# Your code here

Need a hint?

Use print(access_token) to show the token.