Serverless doesn't mean no servers.

You just don't have to worry about them.

Bare

Metal

VMs

App. Servers

Serverless

Hetzner

DigitalOcean

Heroku

AWS Lambda

 /**
  * This is an example of a controller aka handler.
  */
 module.exports.handler = async function registerUserHandler(event, context, callback) {    
     const { name, email, country } = event.body; // This is raw input directly from a client
     const userId = await db.save({ name, email, country });

     events.emit(USER_REGISTERED, userId);

     callback(null, {
         statusCode: 200,
         headers: {},
         body: {
           success: true,
           response: { userId, name, email, country }
         }
     })  
 }

 $ curl -X POST \ 
     -D '{\"name\":\"Kostas\",\"email\":\"konmpar@gmail.com\",\"country\":\"GR\"}' \
     https://a.domain.com/users

 /**
  * Response:
  * 
  * {
  *   success: true,
  *   response: {
  *     userId: 321,
  *     name: "Kostas",
  *     email: "konmpar@gmail.com",
  *     country: "GR"
  *   }
  * }
  */

 service: serverless-example

 provider:
   name: aws
   runtime: nodejs4.3
   environment:
     DYNAMODB_TABLE: ${self:service}-${opt:stage, self:provider.stage}

 functions:
   create:
     handler: users/register.handler
     events:
       - http:
           path: users
           method: post
           cors: true

 resources:
   Resources:
     UsersDynamoDbTable:
       Type: 'AWS::DynamoDB::Table'
       DeletionPolicy: Retain
       Properties:
         AttributeDefinitions:
           -
             AttributeName: id
             AttributeType: S
         KeySchema:
           -
             AttributeName: id
             KeyType: HASH
         ProvisionedThroughput:
           ReadCapacityUnits: 1
           WriteCapacityUnits: 1
         TableName: ${self:provider.environment.DYNAMODB_TABLE}