@serverless/backend

Backend

 

Easily host entire web applications on a single AWS Lambda function using this Serverless Component.

Features

• Designed to make it easy to host pre-existing web frameworks (e.g. Express.js, Hapi) or any large web application on a single AWS Lambda Function.
• Blazing Fast Uploads via AWS S3 Accelerated Transfer and Multi-Part.
• Dependencies are automatically put in AWS Lambda Layers, reducing cold-start time and further reducing upload time.
• Simple shim for receiving and responding to HTTP requests.
• Supports specifying custom domains.

 

1. Install
2. Create
3. Configure
4. Deploy

 

1. Install

$ npm install -g serverless

2. Create

$ mkdir backend && cd backend

The directory should look something like this:

|- serverless.yml # required
|- index.js       # required
|- package.json   # optional
|- .env           # your AWS api keys

# .env
AWS_ACCESS_KEY_ID=XXX
AWS_SECRET_ACCESS_KEY=XXX

You must include an index.js file that looks like this:

module.exports = async (e, ctx, cb) => {
  return { statusCode: 200, body: 'backend app deployed.' }
}

// you could also just return an object
// which would return it as body with
// 200 status code by default
// module.exports = () => ({ hello: 'world' })

// or just a string
// module.exports = () => 'success'

// or a status code number
// module.exports = () => 404 // not found!

// you don't even need to export a function!
// module.exports = { hello: 'world' } // great for mocking!
// module.exports = 'success'
// module.exports = 500

3. Configure

All the following inputs are optional. However, they allow you to configure your Lambda compute instance and pass environment variables.

# serverless.yml

backend:
  component: '@serverless/backend'
  inputs:
    code:
      root: ./code # The root folder containing the backend code.
      src: dist # The folder within your 'src' directory containing your built artifacts
      hook: npm run build # A hook to build/test/do anything
    region: us-east-1
    runtime: nodejs10.x # The runtime for the lambda. Only nodejs10.x or nodejs8.10 are allowed
    memory: 128
    timeout: 10
    description: A function for the registry backend.    
    bucketName: myBucket # (Optional) The Bucket name where `src` files/folder will be upload.
                         # If not provided, it will create random bucket name prefixed by `backend-`
    env:
      TABLE_NAME: my-table

    # You can specify a custom domain name for your backend.
    # You must have a public hosted zone available for this domain in AWS Route53.
    # This is done automatically for you if you've purchased the domain via AWS Route53.
    domain: api.example.com

4. Deploy

$ serverless

All requests to this root url will be proxied directly to your lambda function, giving you full control of the http layer.

 

New to Components?

Checkout the Serverless Components repo for more information.