While examining someone else's code, I noticed this particular line.
if (process.env.NODE_ENV === 'production') { ...
The application in question is a node.js app with express server and reactjs front-end. If we were to deploy it on Heroku, would the NODE_ENV variable be automatically assigned (or set by Heroku) or do I need to assign it manually like other environment variables on the development server?
According to the information provided, when deploying on Heroku, NODE_ENV is automatically set to production: https://devcenter.heroku.com/articles/nodejs-support#runtime-behavior
When it comes to process.env, we are referring to the environment variables that exist on the system. The behavior of these variables depends greatly on where the application is being run and how the system has been configured. For example, when using Heroku, it may not be aware of whether a specific version of your app is in testing or production mode. In order to address this, developers can define an environment and include 'production' as a variable within that environment.
If you are utilizing npm, you have the ability to add variables through script commands.
{
..
"scripts": {
"dev": "corss-env ENVIRONMENT=development ..",
"prod": "cross-env ENVIRONMENT=production .."
}
..
}
You can then use the appropriate command based on the settings you have established.
When working on your Heroku project, make sure to set all environment variables by navigating to your project's settings and Config Vars tab. Here you can set NODE_ENV as production.
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