How to get access token claims in a Blazor Server app using OIDC?

Question

In a Blazor server application that uses OIDC, the following code can access the authentication state and user claims.

@code {
    [Inject] AuthenticationStateProvider AuthStateProvider { get; set; }

    protected override async Task OnInitializedAsync()
    {
        var authState = await AuthStateProvider.GetAuthenticationStateAsync();
        var claims = authState.User.Claims;
    }
}

claims contain the following

However, the access token returned from the OIDC provider had many more claims such as scope , client_id , aud , etc.

How to access all claims in the access token from a Blazor Server component?

Answer 1

by default the OpenIDConnect handler will filter out and only include some specific claims. To map other claims, then you need to map them one by one using

AddOpenIdConnect(OpenIdConnectDefaults.AuthenticationScheme, options =>
                {
           
                    options.ClaimActions.MapUniqueJsonKey("myclaim", "myclaim");
                    options.ClaimActions.MapUniqueJsonKey("role", "role");
...

See this resource Mapping, customizing, and transforming claims in ASP.NET Core