Reducing the AWS Lambda function size can be beneficial to reduce deployment times, improve performance, and manage costs. Here are some tips to help you reduce the size of your AWS Lambda Node.js function:

  1. Remove Unused Dependencies: Ensure that you only include the required dependencies in your Lambda function. Analyze your package.json and remove any packages that are not used by your function.

  2. Use Smaller Packages: Whenever possible, use smaller and more lightweight packages. For example, you can use lodash-es instead of lodash, as lodash-es provides better tree-shaking support and smaller bundle sizes.

  3. Minify and Tree-Shake Code: Minify your JavaScript code to remove unnecessary characters and whitespace. Tree-shaking can also help remove unused code from your bundles, reducing the size.

  4. Limit External Dependencies: Avoid using large external dependencies that are not required by your Lambda function. For example, if you only need a specific utility function from a package, consider writing your own lightweight version instead of importing the entire package.

  5. Use Serverless Packaging Plugins: If you are using a serverless framework (e.g., Serverless Framework or AWS SAM), utilize packaging plugins that can optimize your function's deployment package size automatically.

  6. Use AWS SDK Version 2: If you are using the AWS SDK in your Lambda function, consider switching to version 2 (AWS SDK for JavaScript v3). It is modular and has a smaller size compared to version 1 (AWS SDK for JavaScript v2).

  7. Enable Function Level Concurrency: By enabling function level concurrency in your Lambda function, you can reduce the need for creating multiple instances of the same function, leading to potential savings in function size and resource usage.

  8. Use Webpack or Rollup: Use bundlers like Webpack or Rollup to bundle and optimize your code. These tools can help reduce the final size of your deployment package.

  9. Use Built-in Node.js Modules: Prefer using built-in Node.js modules whenever possible, as they are already included in the Lambda runtime environment, and you won't need to bundle them with your function.

  10. Avoid Including Large Files: Avoid including unnecessary large files (e.g., images, videos) in your deployment package. Instead, store them in external storage services like Amazon S3 and access them via URLs.

Remember that reducing the size of your Lambda function should be balanced with the need for proper functionality and maintainability. Always test your Lambda function thoroughly after making changes to ensure that it still functions as expected.

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