Advanced API Testing Interview Questions with Answers

We looked at some of the commonly asked Basic API Testing Interview Questions in the previous article. In this article, we will look at some of the Advanced API Testing Interview Questions that are frequently asked in interviews.

What are the different authentication methods used in API Testing?

There are different authentication methods used in API Testing like Basic, Digest, OAuth, Bearer, API Key, JWT, HMAC, OAuth2, SAML, OpenID Connect, etc.

How to pass the authentication token in the API request?

We can pass the authentication token in the API request using the Authorization header. We can pass the authentication token in the Authorization header as Bearer token.

What is difference between Refresh Token and Access Token in OAuth2?

The Access Token is used to access the API resources, whereas the Refresh Token is used to get a new Access Token when the Access Token expires.

How to send a file as a part of the request in API Testing?

We can send a file as a part of the request in API Testing using the multipart/form-data content type. We can use the POST method to send the file as a part of the request.

How to handle the pagination in the API response?

We can handle the pagination in the API response using the page and limit query parameters. We can pass the page and limit query parameters in the API request to get the paginated response. Note: The pagination depends on the API design. Some APIs use the offset and limit query parameters for pagination.

How to handle the error response in the API request?

We can handle the error response in the API request using the HTTP status codes. We can use the HTTP status codes like 400, 401, 404, 500 to handle the error response.

How to pass cookies in the API request?

We can pass cookies in the API request using the Cookie header. We can pass the cookies in the Cookie header in the API request.

How to handle the rate limiting in the API response?

We can handle the rate limiting in the API response using the Retry-After header. The Retry-After header specifies the time in seconds after which the client can make the next request.

How to handle the API versioning in the API request?

We can handle the API versioning in the API request using the Accept header. We can pass the API version in the Accept header as application/vnd.companyname.v1+json.

How to handle the API response caching in the API request?

We can handle the API response caching in the API request using the Cache-Control header. We can pass the Cache-Control header in the API response to specify the caching behavior.

What is OAuth2? and how it works?

OAuth2 is an authorization framework that allows the third-party applications to access the user data without sharing the user credentials. OAuth2 works by granting the access token to the third-party applications after the user authorization.

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