Simplify Your AWS Lambda Development with Middy's Middleware Engine for Node.js

As an AWS Lambda developer, you know the importance of writing efficient and the code that address a single concern. With Middy, you can take your development to the next level by simplifying your Lambda code and focusing on the strict business logic.

Middy is designed to allow developers to attach additional common elements such as authentication, authorization, validation, and serialization in a modular and reusable way. This middleware engine separates the concerns of your code, allowing you to focus on the business logic and not on the peripheral elements. This makes your code more efficient, and maintainable.

Middy is built to help with all AWS Events that can connect with AWS Lambda.

Middy offers a wide range of middlewares, including:

1. warmup: Used to pre-warm a lambda function | #Misc
2. do-not-wait-for-empty-event-loop: Sets callbackWaitsForEmptyEventLoop property to false | #Misc
3. http-json-body-parser: Automatically parses HTTP requests with JSON body and converts the body into an object. | #RequestTransformation
4. validator: Automatically validates incoming events and outgoing responses against custom schemas. | #RequestTransformation
5. http-content-encoding: Sets HTTP Content-Encoding header on response and compresses response body | #ResponseTransformation
6. http-cors: Sets HTTP CORS headers on response | #ResponseTransformation
7. secrets-manager: Fetches parameters from AWS Secrets Manager. | #FetchData
8. ssm: Fetches parameters from AWS Systems Manager Parameter Store. | #FetchData
9. sts: Fetches credentials to assumes IAM roles for connection to other AWS services. | #FetchData
10. And many more!

Using Middy, you can easily mix and match these middlewares to fit your project's needs. This makes your code more modular and reusable, reducing duplication and saving you time in development.

Middy also allows you to define custom middleware, making it highly customizable to fit your specific use case. This makes Middy a flexible and powerful tool for any Lambda developer.

Why Use Middy?

Middy has gained popularity in the AWS Lambda community due to its lightweight and modular approach. By separating concerns, Middy allows developers to write code that is easy to read, test, and maintain.

Getting Started

Install middy using npm:

npm install --save @middy/core        

Usage

import middy from '@middy/core'
import middleware1 from 'sample-middleware1'
import middleware2 from 'sample-middleware2'

const lambdaHandler = (event, context) => {
  /* your business logic */
}

export const handler = middy(lambdaHandler)

handler
  .use(middleware1())
  .use(middleware2())        

1. import '@middy/core'
2. import other middlewares that you may want to use
3. Create a handler function for your Lambda
4. Wrap your Lambda handler in the 'middy()' factory function, this will return a new enhanced instance of your original handler, to which you can attach middlewares using '.use()'
5. '.use()' takes a single middleware or array of middlewares

For a more detailed information about how it executes by looking at the execution order, please head to middy's How it Works? page.

For assistance on how to use middlewares with AWS events, or how to build custom middlewares, please DM me, happy to spread the knowledge.

Conclusion

In conclusion, Middy is an excellent choice for any AWS Lambda developer looking to streamline their development process. With its lightweight and modular approach, Middy allows you to separate concerns, reduce duplication, and focus on the strict business logic of your Lambda function.

If you're looking for a powerful and flexible middleware framework for your AWS Lambda development, be sure to check out Middy.