API key authentication in Postman - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is API key authentication?

API key authentication is a method where a unique key is sent with API requests to identify and authorize the client.

beginner

Where can you include an API key in a request?

You can include an API key in the request header, URL query parameters, or sometimes in the request body depending on the API design.

beginner

Why should API keys be kept secret?

API keys grant access to resources. If exposed, unauthorized users can misuse the API, leading to security risks and data breaches.

beginner

How do you add an API key in Postman for testing?

In Postman, you can add an API key by going to the 'Headers' tab and adding a key-value pair, or use the 'Authorization' tab with the API Key type to set the key and its location.

beginner

What happens if you send a request without a required API key?

The server usually responds with an error like 401 Unauthorized or 403 Forbidden, indicating that authentication failed or access is denied.

What is the main purpose of an API key?

A To speed up the API

B To identify and authorize the client

C To encrypt the data

D To style the API response

API keys are used to identify and authorize clients making API requests.

Where can you NOT typically send an API key?

A Request header

B URL query parameters

C Request body

D Response body

API keys are sent with requests, not in the response body.

In Postman, which tab is commonly used to add an API key?

A Tests

B Body

C Headers

D Cookies

API keys are often added in the Headers tab as key-value pairs.

What HTTP status code indicates missing or invalid API key?

A 401 Unauthorized

B 200 OK

C 302 Found

D 500 Internal Server Error

401 Unauthorized means authentication failed, often due to missing or invalid API key.

Why should API keys never be shared publicly?

A They can be used by others to access your API

B They expire immediately

C They can slow down the API

D They are only for decoration

Sharing API keys publicly risks unauthorized access to your API.

Explain how API key authentication works and how you would test it using Postman.

Think about where the key goes and what happens if it is missing.

Describe best practices for handling API keys securely.

Consider how to protect keys from misuse.