serverless.yml

# serverless.yml
service: serverless-express-lambda

provider:
  name: aws
  runtime: nodejs8.10
  stage: ${opt:stage, self:custom.defaultStage}
  region: ${opt:region, self:custom.defaultRegion}
  iamRoleStatements:
    - Effect: Allow
      Action:
        - dynamodb:Query
        - dynamodb:Scan
        - dynamodb:GetItem
      Resource: "*"

custom:
  defaultStage: dev
  defaultRegion: us-west-2
  defaultCognitoPoolArn: arn:SOMETHING

plugins:
  - serverless-offline

functions:
  serverlessExpressApi:
    name: ${self:provider.stage}-serverless-express-lambda
    description: API definition written in express
    handler: index.handler
    memorySize: 128
    timeout: 30
    environment:
      NODE_ENV: ${opt:stage, self:custom.defaultStage}
    events:
      - http: 
          path: /
          method: ANY
          cors: true
      - http: 
          path: /docs/{proxy+}
          method: ANY
          cors: true
      - http: 
          path: /{proxy+}
          method: ANY
          cors: true
          authorizer:
            arn: ${opt:cognitoPoolArn, self:custom.defaultCognitoPoolArn}

resources:
  Resources:
    userGiftTable:
      Type: AWS::DynamoDB::Table
      Properties:
        TableName: user_gifts
        AttributeDefinitions:
          - AttributeName: email
            AttributeType: S
          - AttributeName: gift_id
            AttributeType: N
        KeySchema:
          - AttributeName: email
            KeyType: HASH
          - AttributeName: gift_id
            KeyType: RANGE
        ProvisionedThroughput:
          ReadCapacityUnits: 4
          WriteCapacityUnits: 2