Add SSO to Your Flask App Using WorkOS

August 19, 2021

If your SaaS product is built with Python’s Flask web framework and you want to add SSO functionality for your customers, you can do a dry-run of the SSO integration on our example Flask app. It makes use of the WorkOS Python SDK to authenticate users via SSO.

If you get stuck while following the steps below and aren't able to resolve the issue by reading our API reference or SSO Setup Guide, please reach out to us at [email protected] so we can help.


  • Python 3.6+

Flask Project Setup

1. In your CLI, navigate to the directory into which you want to clone this git repo.

2. Clone this git repo using your preferred secure method (HTTPS or SSH).


3. Navigate to the cloned repo.

4. Create and source a Python virtual environment. You should then see (env) at the beginning of your command-line prompt.

5. Install the cloned app's dependencies.

6. Obtain and make note of the following values. In the next step, these will be set as environment variables.

7. Ensure you're in the root directory for the example app, python-flask-sso-example/. Create a .env file to securely store the environment variables. Open this file with the Nano text editor. (This file is listed in this repo's .gitignore file, so your sensitive information will not be checked into version control.)

8. Once the Nano text editor opens, you can directly edit the .env file by listing the environment variables:

To exit the Nano text editor, type CTRL + x. When prompted to "Save modified buffer", type Y, then press the Enter or Return key.

9. Source the environment variables so they are accessible to the operating system.

You can ensure the environment variables were set correctly by running the following commands. The output should match the corresponding values.

10. In python-flask-sso-example/ change the CUSTOMER_EMAIL_DOMAIN string value to an email domain that makes sense for your testing purposes if the default isn't relevant.

11. The final setup step is to start the server.

You'll know the server is running when you see no errors in the CLI, and output similar to the following is displayed:

Navigate to localhost:5000 in your web browser. You should see a "Login" button. If you click this link, you'll be redirected to an HTTP 404 page because we haven't set up SSO yet!

You can stop the local Flask server for now by entering CTRL + c on the command line.

SSO Setup with WorkOS

Follow the SSO authentication flow instructions to set up an SSO connection.

When you get to the step where you provide the REDIRECT_URI value, use http://localhost:5000/auth/callback.

If you get stuck, please reach out to us at [email protected] so we can help.

Testing the Integration

Navigate to the python-flask-sso-example directory. Source the virtual environment we created earlier, if it isn't still activated from the steps above. Start the Flask server locally.

Once running, navigate to http://localhost:5000 to test out the SSO workflow.


Need help?

If you get stuck and aren't able to resolve the issue by reading our API reference or SSO Setup Guide, reach out to us at [email protected] so we can help.

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