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This article will show you how to hook up a custom Node.js runtimes and layers for AWS Lambda. Lambda Layers are a new type of artifact that can contain arbitrary code and data. This means you can share and manage common code between functions. Using Lambda layers, you can manage components that are used across multiple functions, allowing better code reuse and more DRY code. It's like serverless but for running entire back ends. You can host and scale apps automagically. Pretty neat.