Function done

code/ch16/serverless/index.js:11–17

(err, res)

exports.handler = (event, context, callback) => {
    // Callback to finish response
  const done = (err, res) => callback(null, {
    statusCode: err ? '400' : '200',
    body: err ? err.message : JSON.stringify(res),
    headers: {
      'Content-Type': 'application/json'
    }
  })
    // To support mock testing, accept object not just strings
  if (typeof event.body === 'string') { event.body = JSON.parse(event.body) }
  switch (event.httpMethod) {