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Solving the User.Identity.Name is null Issue in Blazor WASM Hosted in ASP.NET Core

Discover how to resolve the common `User.Identity.Name is null` problem in Blazor WebAssembly applications hosted in ASP.NET Core. --- This video is based on the question https://stackoverflow.com/q/70027764/ asked by the user 'David Olejnik' ( https://stackoverflow.com/u/8935264/ ) and on the answer https://stackoverflow.com/a/73306155/ provided by the user 'Fitri Halim' ( https://stackoverflow.com/u/13218799/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: User.Identity.Name is null for Blazor Wasm hosted in asp.net core Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Solving the User.Identity.Name is null Issue in Blazor WASM Hosted in ASP.NET Core When building an application using Blazor WebAssembly (WASM) hosted in ASP.NET Core, you might encounter an issue where User.Identity.Name returns null. This can be frustrating, especially when you're using the default Visual Studio template and expecting user identity information to be readily available for your application. In this guide, we'll walk through understanding the problem and how you can effectively resolve it. The Problem: Null User Identity In your Blazor application, you might find that despite setting up Identity services, the User.Identity.Name property is returning null. This indicates that the claims, which provide user information like their name and email address, are not correctly populated. Here's a breakdown of the situation: Context: You're using the default Visual Studio template for a Blazor WebAssembly application. Setup: You're configuring Identity Server to handle API authorization. Symptoms: Missing claims for name and email, leading to User.Identity.Name being null. The typical configuration using IdentityServer with API authorization may not include certain claims by default, which results in the null value for User.Identity.Name. The Solution: Adding Claims to Identity Resources After experiencing this issue firsthand, I found a solution that worked effectively. The key step is to explicitly add the necessary claims to your identity resources within the identity setup. Here's how you can do this: Step-by-Step Guide Modify Identity Setup: You'll want to update the AddIdentityServer() configuration in your Startup.cs file. This will ensure that the necessary claims are included in your identity resources. Add the Claims: You need to add the name claim to both the openid scope and API resources. Here’s the code you should add to your configuration: [[See Video to Reveal this Text or Code Snippet]] Explanation of the Code services.AddIdentityServer(): This method registers the Identity Server services with your ASP.NET Core application. AddApiAuthorization<ApplicationUser, ApplicationDbContext>(opt => {...}): This line sets up API authorization for your application user model and database context, with options to customize. opt.IdentityResources["openid"].UserClaims.Add("name");: This adds the name claim to the openid identity resource, allowing you to retrieve the user's name later on. opt.ApiResources.Single().UserClaims.Add("name");: This line ensures that the name claim is also included for API resources, which is important for API calls relying on user identity. Final Thoughts Once you've made these changes, try testing your application again. The User.Identity.Name should now correctly reflect the user's name once authenticated. If you're still facing issues or have additional questions, feel free to reach out. The Blazor community is always here to help! By following these instructions, not only will you be able to resolve the User.Identity.Name is null issue, but you'll also gain a deeper understanding of how claims and identity work within ASP.NET Core and Blazor. If you found this post helpful, make sure to share it with others facing similar issues. Happy coding!