This series is about teaching Léo to become a professional developer from scratch. Léo can be any of you, desiring to learn and grow 🚀
Learn by doing challenging projects, be mentored to achieve your goals and join a dedicated community ⚡
Apply here, it will be always be free ♥ https://mentorleo.co
If you followed the #week2 at MentorLéo, you already installed Node.js. You needed NPM, its package manager included with it, to manage your dependencies like a hero ! React, WebPack, Sass, Babel, …
Week 3 — Day 1
The hacker way
Write instructions with your terminal:
> var mentor = '@damien';
> console.log('My Mentor for this mentorleo.co project is ' + mentor);
The “>” indicates that you entered the Node execution loop. Tap Ctrl+C to exit the loop. This shortcut sends a killing signal, you can use it to kill almost every program running in your terminal.
You may never need to use this, it’s just background knowledge here :)
The sexy way
Create a hey.js file and write the same code:
$ node hey.js
Build a server
We will build a server that handles HTTP requests. Your browser uses this protocol to fetch and submit data. You can see all the HTTP requests sent when you load a page in the Network panel of the Chrome DevTools. Try that for what you built with #week1 / #week2, or even for this page !
The 2 most common used “Verbs” or “Request Methods” HTTP request have are:
- GET: fetch data
- POST: submit data
If you want to go deeper in HTTP verbs, check-out REST:
The term representational state transfer was introduced and defined in 2000 by Roy Fielding in his doctoral…en.wikipedia.org
Aside from HTTP, there are other protocols with which you can communicate. You’ll manipulate some in other projects at MentorLéo 😎
THE easiest way to get started with HTTP server with Node.
$ npm install express
Create an app.js file that contains:
$ node app.js
In your browser, go to http://localhost:8080/hello
8080 is the port on which runs the server. Every server that uses any network protocol (HTTP or other) need a port to run onto. It’s like telephone numbers, 2 cellphones can’t use the same number at the same time.
/hello is what we call a route. HTTP servers expose routes to allow users to ask something (example: fetch data).
The result you see on the page is what we told the server to send when we hit that route /hello.
I want to you to build another route that uses a parameter.
If I go to
I want the server to return “Hello Damien ! Nice to meet you 🙌” (with the first letter of the name in uppercase).
You can use this documentation: https://expressjs.com/en/guide/routing.html
Next day, we’ll see how to store data using databases \o/
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