如何使用Node.js访问Google App Engine上的process.env

Question

I'm using react on google app engine.

As is written in the documentation: https://cloud.google.com/appengine/docs/standard/nodejs/runtime#environment_variables

I can access the following Env Variable:

Environment variable    Description
GAE_APPLICATION The ID of your App Engine application.
GAE_DEPLOYMENT_ID   The ID of the current deployment.
GAE_ENV The App Engine environment. Set to standard.
GAE_INSTANCE    The ID of the instance on which your service is currently running.
GAE_MEMORY_MB   The amount of memory available to the application process, in MB.
GAE_RUNTIME The runtime specified in your app.yaml file.
GAE_SERVICE The service name specified in your app.yaml file. If no service name is specified, it is set to default.
GAE_VERSION The current version label of your service.
GOOGLE_CLOUD_PROJECT    The GCP project ID associated with your application.
NODE_ENV    Set to production when your service is deployed.
PORT    The port that receives HTTP requests.

When I deploy my app on google app engine and print process.env console.log(process.env) I have only:

NODE_ENV: "production"
PUBLIC_URL: ""

In the documentation is explicitly written "The following environment variables are set by the runtime", but there are no one of them.

What is wrong?

Answer 1

What it means by "The following environment variables are set by the runtime" is applicable to applications executed by node . As such, the process.env printed when ran from an express.js application contains those environment variables because you would be executing your code as node .bin/www or node server.js as opposed to react-scripts start when deploying a react.js application. In this case, it is create-react-app who has the responsibility in setting the environment variables. Alternatively, you can manually set these environment variables in accordance to the create-react-app specifications.