Getting Started
In VS Code, create and open a new folder named node_events Create an server.js file Import “EventEmitter” from the events module You will also need the path, http, and fs modules imported to use
PART 1: Using the EventEmitter class, create a new EventEmitter instance called “NewsLetter” Instantiate a new server instance with createServer Inside the server request handler, listen for the ‘data’ event to be emitted, and pass in a callback function that pushes each ‘chunk’ into an array named ‘chunks’ Listen for the request ReadStream ‘end’ event, and pass in a callback that contains a conditional statement (if/else) The conditional statement will check the request url and method, and if they are “POST” and “/newsletter_signup”, decode the chunks array with Buffer.concat().toString(), and use JSON.parse() on the result to access the request body values Next, emit a ‘signup’ event, and pass in the value to be used by your event listener callback (name + email is what is passed to the csv record) Write and end the response to the client
PART 2 Account for any method or url that is not “POST” + “/newsletter_signup” Outside of your server request handler, add an event listener for a ‘signup’ event on the NewsLetter EventEmitter Pass in a callback that takes in a ‘contact’ as a parameter This function should use fs.appendFile() to add the contact to a csv file in your project directory Account for errors Initialize the node app and test with Postman
BONUS A get request to your “/newsletter_signup” endpoint should send back an html page with a form This form should have labels and inputs for name and email This form should send the name and email as the request body to your server to process and add to your newsletter.csv file (you’ve already completed this logic) If the action is successful or unsuccessful, display feedback to the user on the html page