# Show environment variables in Heroku

- Published: 2015-12-12
- URL: https://notes.webutvikling.org/show-environment-variables-in-heroku
- Tags: heroku

I was looking for **WEB_CONCURRENCY** environment variable on my Django-app. This is used for the number of concurrent webworkers for gunicorn, and is automatically scaled depending on the memory usage of your app.

I can do it with the [toolbelt](https://toolbelt.heroku.com/), and the command

```bash
heroku run printenv --app your-app-name | grep WEB_CONCURRENCY
```

For environment variables that are set by us as a setting, the can also be found
with:

```bash
heroku config --app your-app-name
```

Read more on optimizing your app [here](https://devcenter.heroku.com/articles/optimizing-dyno-usage)

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_Yes, Cows are obvious environment variables_