Creating process.env variables using AWS Amplify?

Question

With serverless we can add process.env variables by creating a configuration file entry like this:

environment:
    STRIPE_SECRET_KEY: ${self:custom.secrets.stripeSecretKey} # Stripe secret API key

And we can access it in our lambda function like this:

const stripe = require('stripe')(process.env.STRIPE_SECRET_KEY);

How do we do this with AWS Amplify?

Answer 1

After a year+ of development using amplify framework I figured that you can only specify ENV VARIABLE form from your front-end build process. for lambdas it's a bit tricky. You can add a condition "IsProductionEnv" which is going to place value to ENV Variables for that function depending on amplify env. for production I use "prod" you can use whatever you want. go to your amplify/backend/function/{functionName} folder. there should be {functionName}-cloudformation-template.json file. you need to add one more item to "Conditions" object:

"Conditions":{
  ...,
  "IsProductionEnv": {
      "Fn::Equals": [
        {
          "Ref": "env"
        },
        "prod"
      ]
    }
}

then you need to use that condition at "Resources.Properties.Environment.Variables" :

       "Environment": {
          "Variables": {
            ...,
            "STRIPE_PK": {
              "Fn::If": [
                "IsProductionEnv",
                "pk_live_...",
                "pk_test_..."
              ]
            }
          }
        }

I have "dev" and "prod" amplify env names. it will handle your deployments and manage your env variables based on env for that function.