Discovering my RDS connection details

Serverless Framework
2

Value that you’re looking for is exposed in resource output as Endpoint.Address (https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-rds-database-instance.html section Return Values).

Then, you can pass it to your Lambda function using Fn:GetAtt like this:

functions:
  helloFunction:
    environment:
      DATABASE_URL: 
        Fn::GetAtt:
          - MarketDB
          - Endpoint.Address
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