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How to debug a Python Flask app?

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Sometimes, we want to debug a Python Flask app.

In this article, we’ll look at how to debug a Python Flask app.

How to debug a Python Flask app?

To debug a Python Flask app, we set the FLASK_APP and FLASK_ENV environment variables before running the app.

To do this on Linux and Mac, we run

export FLASK_APP=myapp
export FLASK_ENV=development
flask run

to set the environment variables with export.

And then we run flask run to run the app.

On Windows, we replace export with set in the command prompt.

And in Windows PowerShell, we run

$env:FLASK_ENV = "development"

to set the environment variables with $env:.

Conclusion

To debug a Python Flask app, we set the FLASK_APP and FLASK_ENV environment variables before running the app.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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