AWS Lambda Layers

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by The Captain

July 28, 2023

AWS Lambda Layers Tutorial: Simplifying Serverless Application Development

In this tutorial, we will explore AWS Lambda Layers, a powerful feature that simplifies serverless application development on AWS. Lambda Layers allow you to manage and share code, data, and dependencies across multiple functions in your serverless application. This promotes code reuse, enhances collaboration, and reduces the size and complexity of your Lambda functions.

What are AWS Lambda Layers?

AWS Lambda Layers are a distribution mechanism for libraries, custom runtimes, and other function dependencies. Layers let you manage common components of your application independently of your Lambda function code. You can include libraries, custom runtimes, or even entire frameworks in your layer and attach it to multiple functions. This approach allows you to avoid duplicating the same code across your functions and ensures that all your functions use the same version of the shared components.

Benefits of Using Lambda Layers

Using Lambda Layers offers several benefits:

  1. Code Reusability: By placing reusable code in a layer, you can easily share it across multiple functions, reducing duplication and making updates more efficient.
  2. Reduced Deployment Package Size: When you place code in a layer, you no longer include it in your deployment package, resulting in smaller package sizes and faster deployment times.
  3. Version Management: Layers allow you to manage versions of libraries and frameworks independently from your function code, giving you flexibility and control over updates.
  4. Collaboration: Layers enable collaborative development by separating shared resources from the core application logic. Different teams or individuals can work on separate layers without impacting each other's code.

Working with Lambda Layers

Creating and using Lambda Layers is a straightforward process. Here's a high-level overview:

  1. Create a Layer: Package your code, libraries, or dependencies into a zip archive and create a Lambda Layer using the AWS Management Console, AWS CLI, or SDKs.
  2. Reference the Layer: In your Lambda function configuration, add the reference to the Layer and specify the version to use.
  3. Access Layer Content: Once the layer is attached, your function has access to the contents of the layer, including libraries and dependencies.
  4. Manage Layer Versions: You can easily manage different versions of your layer, making it simple to roll back changes or test new versions.


AWS Lambda Layers simplify serverless application development by providing a mechanism to manage and share code, libraries, and dependencies across multiple functions. By leveraging Lambda Layers, you can enhance code reusability, reduce deployment package sizes, and improve collaboration among teams. Start using Lambda Layers today and supercharge your serverless development experience on AWS.