The following is an example of how to implement a fake or mock backend in Blazor WebAssembly with an HTTP Client Handler.

A fake backend is used for doing backendless development in Blazor which allows you to run and test your code without a real backend api, it’s useful for developing front-end code without a backend or before the backend is available.

I created the below fake backend as part of a Blazor WebAssembly - User Registration and Login Example & Tutorial, it’s built by extending the Blazor HttpClientHandler class and includes mock endpoints for authentication, registration and user management, and uses browser local storage to store data to mimic the behaviour of a real api with a database.

The fake backend contains a handleRoute() local function that checks if the request matches one of the faked routes, matching requests are intercepted and handled by one of the below // route functions, non-matching requests are sent through to the real backend by calling base.SendAsync(request, cancellationToken);. Below the route functions there are // helper functions for returning different response types and performing small tasks.

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