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Sitecore Symposium 2019: Build JSS Websites with Blazor


Blazor is Microsoft’s very new and exciting technology. This session was led by two Sitecore MVPs and showed a proof of concept for creating a JSS framework for Blazor. Since Blazor is not yet supported by Sitecore, the project is community-driven. Here are my key takeaways from their presentation:

  • What is Blazor?
    • A new web development framework from Microsoft
    • Interactive web UI built on C# and .NET Core
    • Competes with Angular and React
    • Uses SignalR or WebAssembly
    • Open source
    • Removes the barriers of Webpack, Npm, and Babel
  • Blazor Hosting Methods:
    • Blazor Server
    • Blazor WebAssembly
  • Blazor Server:
    • How it works
      • Persistent connection from the client to the server
      • Events are sent to the server using SignalR
      • Blazor server runs on .NET Core and sends html to the client
    • Advantages
      • Server side debugging
      • Small download size
      • Faster load time
      • Thin client support
    • Disadvantages
      • Noticeable latency
      • No offline support
      • .NET Core required
        • Means it’s not easily compatible with Sitecore
  • Blazor WebAssembly
    • How it works
      • Gives languages a true way to run in the browser
      • Code is NOT compiled to javascript
    • Advantages
      • Language familiarity
      • Offline support
      • Runs client side
      • Host anywhere
      • Can work with Sitecore since rendering host is separate from Sitecore
    • Disadvantages
      • Still under construction
      • Full release expected 5/2020
      • Limited to existing browser capabilities
      • Horrible debugging
      • Huge download size
        • 9.5MB base for webassembly dlls
        • Size increases as you add your own code and other external libraries
  • JSS Blazor
    • Not officially supported by JSS for Sitecore
    • Community driven
      • Visit to find the github repo and start contributing or testing
    • Officially launched at Sitecore Symposium 2019
    • Not ready for production use
      • Proof of concept stage today
      • Still a little slow compared to other JSS frameworks
    • Built on webassembly
    • Full 1-1 mapping of base style guide from JSS/Angular and JSS/React

JSS framework on Blazor presenters
Sitecore Symposium has many interesting sessions. I have been documenting the ones I have been attending and adding them to my session review. Follow me to get updates!

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Eric Sanner, Solutions Architect

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