Forgetting to set environment variables in nodejs apps

Too Long; Didn't Read

You’ve developed your killer <code class="markup--code markup--p-code">express</code> app. It’s passing unit tests, integration tests, end-to-end tests... You’re so content that you print the code out and pin it to your fridge. You deploy to production, but in a few hours, you get complaints that the service is more or less completely useless. You dig through debug logs, but to no avail — there’s nothing obviously wrong, and tests are passing, so your users must just be exaggerating. All of them.