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Export Layer

1. Get the Layer ARN

Ensure you have the full ARN of the Lambda Layer. It typically looks like:

arn:aws:lambda:<region>:<account-id>:layer:<layer-name>:<version>

For example:

arn:aws:lambda:us-east-1:123456789012:layer:my-nodejs-layer:3

2. Download the Layer Using AWS CLI

You can use the AWS CLI to download the Lambda Layer as a ZIP file:

aws lambda get-layer-version-by-arn --arn <layer-arn> --query 'Content.Location' --output text

This command returns a pre-signed URL to download the layer. Use curl or wget to download it:

curl -o nodejs-layer.zip "<download-url>"

3. Extract the Layer

Unzip the downloaded file:

unzip nodejs-layer.zip -d nodejs-layer

4. Inspect the Directory Structure

For Node.js 18, the Lambda Layer typically follows this structure:

nodejs-layer/
└── nodejs/
    ├── node_modules/
    └── package.json
  • nodejs/: The directory containing the Node.js libraries.
  • node_modules/: The installed dependencies.
  • package.json: The package manifest file.

If the layer contains native binaries or other resources, they might be located in additional directories within the ZIP file.

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