AWS lambda function code for checking the function's IP using ipify.

whatIsMyIp.js

const http = require('http')

const options = { 
  hostname: 'api.ipify.org',
  port: 80,
  path: '/?format=JSON',
  method: 'GET',
}

exports.handler = (event, context, callback) => {
  const request = http.request(options, response => {
    response.setEncoding('utf8')
    response.on('data', data => {
      console.log(JSON.stringify(data))
      callback(null, 'Received data.')
    })
  })

  request.on('error', callback)
  
  request.end()
}