Middy CORS example

handler.js

# handler.js

const middy = require('middy')
const { cors } = require('middy/middlewares')

// This is your common handler, no way different than what you are used to do every day
// in AWS Lambda
const processPayment = (event, context, callback) => {
  // we don't need to deserialize the body ourself as a middleware will be used to do that
  const { creditCardNumber, expiryMonth, expiryYear, cvc, nameOnCard, amount } = event.body

  // do stuff with this data
  // ...

  return callback(null, { result: 'success', message: 'payment processed correctly'})
}

// Let's "middyfy" our handler, then we will be able to attach middlewares to it
const handler = middy(processPayment)
  .use(cors()) // Adds CORS headers to responses

module.exports = { handler }