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Creating Lambda layers for common functions

To save on repetitive code in your Lambda functions, you can define a custom Lambda Layer to add to functions where you need to use the same code. You can do this in the same manner as creating a normal Node.js project, however:

  • Your own code needs to be in the node_modules/your-module-name folder
  • A specific folder structure needs to be present for Lambda to work properly

An example folder structure for the dc-lambda-common layer is below:

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Be careful to move your own code into another folder before running npm install to get your other project dependencies, as npm will remove your code from the node_modules folder if it's in there.

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