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.NET 9–OpenAPI and Scalar–Passing an API key

Let's continue our joruney in discovering Scalar . Today I want to talk about how we can integrate security. Most API's that we build today are secured in a way. This could be as simple as an API key or as complex as using OAuth with PKCE.

In this post we’ll look at how to pass an API key through the Scalar UI. Let’s dive in…

I assume that you already have registered an authentication scheme for your API like this:

Now we need to write an extra transformer to include the authentication information in our OpenAPI metadata.

Don’t forget to register this transformer in our OpenAPI configuration:

At the Scalar level we don’t have to change anything:

But if we now browse to the Scalar UI, the authentication scheme is recognized and we get the option to pass an API key:

 


Nice!

More information

.NET 9–OpenAPI and Scalar–Introduction

.NET 9–OpenAPI and Scalar–Adding custom headers

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