How to Deploy a FastAPI Web App on IIS Server?


Heather Bennett

Deploying a FastAPI web application on an IIS server can seem like a daunting task, but with the right guidance, it becomes much easier. In this tutorial, we will walk through the steps required to deploy your FastAPI app on an IIS server.


Before we begin, make sure you have the following:

  • An IIS Server: Ensure that you have access to an IIS server where you want to deploy your FastAPI app.
  • .NET Core Runtime: Install the latest version of .NET Core Runtime on your server. You can download it from the official Microsoft website.
  • Publishing Tools: Install the .NET Core Publishing Tools if they are not already installed on your server. You can install them using the following command: dotnet tool install -g dotnet-publish-iis.

Step 1: Prepare Your FastAPI App for Deployment

To prepare your FastAPI app for deployment, follow these steps:

  1. Create a Publish Profile: Open a command prompt and navigate to your FastAPI app’s root directory. Run the following command to create a publish profile: dotnet publish-iis --publish-folder [path_to_publish_folder].

    Replace [path_to_publish_folder] with the desired path where you want to publish your app.

  2. Publish Your App: Once the publish profile is created, run the following command to publish your app: dotnet publish --configuration Release --output [path_to_publish_folder]. Again, replace [path_to_publish_folder] with the path you specified in the previous step.

Step 2: Configure IIS for FastAPI

Now that your FastAPI app is prepared for deployment, let’s configure IIS to run it:

  1. Open IIS Manager: Launch the Internet Information Services (IIS) Manager on your server.
  2. Create a New Website: Right-click on “Sites” in the left-hand navigation pane and select “Add Website”. Fill in the required details such as site name, physical path (pointing to your published app folder), and port number.
  3. Configure Application Pool: In the newly created website, click on “Application Pools” in the left-hand navigation pane.

    Right-click on the application pool corresponding to your website and select “Basic Settings”. Choose the appropriate .NET CLR version and click “OK”.

  4. Assign Permissions: Make sure that the identity running your IIS application pool has sufficient permissions to access the published folder. You can grant necessary permissions via Windows file explorer.

Step 3: Test Your FastAPI App on IIS Server

You have successfully deployed your FastAPI app on an IIS server. Now, let’s test it:

  1. Browse Your App: Open a web browser and navigate to http://localhost:[port_number]. Replace [port_number] with the port number you specified during website creation.
  2. Verify Functionality: Interact with your FastAPI app through various endpoints to ensure that everything is working as expected.


Congratulations! You have learned how to deploy a FastAPI web app on an IIS server.

By following the steps outlined in this tutorial, you can successfully deploy your FastAPI app and make it accessible to users via an IIS server. Enjoy developing and deploying your FastAPI apps with ease!

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