"Serverless"  Express@AnnaGerber

Before  you  start

You’ll  need:• An  AWS  account  • An  IAM  user  with  permissions  for  AWS  Lambda,  API  Gateway,  CloudFormation,  DynamoDB,  S3  and  CloudWatch• Recent  version  AWS-­‐CLI  installedhttps://aws.amazon.com/cli/

aws-­‐serverless-­‐express

Library  for  using  AWS  Lambda  and  Amazon  API  Gateway  with  Express

git clone  https://github.com/awslabs/aws-­‐serverless-­‐express

See  example directory  for  sample  app

AWS  Lambda

API  Gateway

Cloud  Formation

Example  app

AWS  SAM

• Serverless Application  Model• JSON  or  YAML• Defines  API  Gateway  APIs,  Lambda  functions,  DynamoDB tables

Configure  the  Sample  app

Setup

npm run  setup

Cloud  Formation  Stack

Stack  Outputs

Example  app

DynamoDB

Persisting  data  to  DynamoDB

To  persist  users  to  DynamoDB:• Add  DynamoDB permissions  to  the  role• Create  DynamoDB table  for  storing  users• Modify  the  CRUD  routes  in  our  Express  app  to  use  DynamoDB instead  of  in-­‐memory  array

Update  role  permission

Create  Table  Users

Modify  the  routes

• Add  the  AWS  SDK  for  DynamoDB support• npm install    -­‐-­‐save  aws-­‐sdk

var AWS  =  require("aws-­‐sdk")var docClient =  new  AWS.DynamoDB.DocumentClient()

Create  a  User

List  Users

List  a  specific  User

Develop  your  API

• Continue  to  develop  as  for  regular  express  app• Logs  for  the  app  can  be  accessed  via  CloudWatch• Edit  package.json to  ensure  additional  resources  are  packaged• To  re-­‐package  and  re-­‐deploy  the  app:

• npm run  package-­‐deploy

• To  tear  down:• npm run  delete-­‐stack