I am a complete newbie in API testing. Now, while sending a GET or POST request , we need to authorize the calling project. How does it work internally and what's the difference between API key and a Token?

enter image description here

  • Voting for closing because this question is about software engineering, not testing. @test234, I suggest asking this question on Stack Overflow. Apr 16, 2023 at 17:46

1 Answer 1


API key authorization is a simple way to authenticate an API request, where a secret key is passed in the request header to authenticate the client. This means that the server checks the key and allows access to the API resources if the key is valid. On the other hand, Bearer token authentication is a more secure and flexible way to authenticate a client. Here, the server provides the client with a token after successful authentication. This token is passed in the request header to access the API resources. The bearer token can also be used to authenticate multiple API requests and is valid for a certain duration. Additionally, bearer tokens can be revoked by the server to stop the client's access to the API resources.

I remember when I was working on an API project, we initially used API key authorization. But later, we switched to bearer token authentication for enhanced security and flexibility. Bearer tokens allowed us to authenticate multiple API requests without repeatedly sending the API key in each request header, which reduced the load on the server. Also, the bearer tokens had a validity period, which ensured that only authorized clients were able to access the API resources during that period. So, if you're planning to develop a scalable and secure API, I would suggest going for bearer token authentication in Postman.

I hope this explanation helps you understand the difference between bearer token and API key authorization in Postman API testing. Feel free to ask me if you have any more questions. Good luck with your API testing!

  • 1
    When linking to a site you are affiliated with, you need to be explicit about the relationship. Please review How to not be a spammer.
    – tripleee
    Apr 19, 2023 at 11:29
  • I have edited your answer to remove the link. Without it, this is a decent answer. With the link, since you did not state your affiliation with the site, it is borderline spam. If you want to reinstate the link, then please edit your answer and be sure to state your affiliation with the site.
    – Kate Paulk
    Apr 19, 2023 at 11:58

Not the answer you're looking for? Browse other questions tagged or ask your own question.