1. Practice the concepts
2. Node.js exercises
3. Code along
4. PROJECT: HackYourTemperature III

The problems in the practice the concepts section are designed to get you warmed up for the real exercises below. You do not have to submit your code, but you have to finish all the exercises.

This week you'll finish the command line exercises. Go back to learnyounode and start doing exercises 11 (HTTP FILE SERVER ) until 13 (HTTP JSON API SERVER)

Inside of your Node.js fork, go to the folder week3. Inside of that folder, create a folder called homework. Inside, create a folder called nodejs-exercises. This will contain all the files for the following section.

Did you know that there is an API for Chuck Noris jokes. That's incredible, right!?

Write a small node program (not a server) that calls the this API http://www.icndb.com/api/ and prints a random joke to the conole.

Step 0. Create a new folder e.g. exercise1. Honestly guys do I even have to say this anymore.
Step 1. In the folder you just created, initalize npm.
Step 2. Create a javascript file that will hold the code for your program.
Step 3. Install and require node-fetch.
Step 4. GET a random joke from the URL http://www.icndb.com/api/
Step 5. Print the joke to the console

Hints:

• First, print the entire response to the concole to see how it is structured.

This is the last time that steps 0-2 are explicitly written. For the next exercise I am assuming you know this already.

So far all the APIs we used would happily respond to any request. In reality, most APIs hold sensitive information that should not be accessible for everyone. In order to guard the data APIs use some way to authenticate the user. The simplest form of authentication is called basic. Similarly to how you log in to a website, the basic authentication expect a username and a password. This is sent in the request as part of the header, under the type: Authorization. The content of the header is: Basic <username>:<password>. Naturally, there is catch. The username and password are not sent as plain text, but need to be encoded in base64, which is a way of encoding text for use in HTTP.

For this exercise you need to write a program thats calls the API https://restapiabasicauthe-sandbox.mxapps.io/api/books and prints the response to the console.

You need to use the credentials admin:hvgX8KlVEa to authenticate.

Step 1. Feel free to copy and modify the code from the previous exercise.
Step 2. Visit https://www.base64encode.org/ to convert admin:hvgX8KlVEa to base64
Step 3. Set the authorization header in the GET request - fetch(<URL>,{ headers: { 'Authorization': 'Basic XXXXXX' } }
Step 4. Print the response

Bonus points if you can encode the username and password to base64 using javascript code.

Write a program that makes a reservation for the biggest party on the planet and prints the response. I will not explain how the API works, instead you should read the documentation - https://reservation100-sandbox.mxapps.io/rest-doc/api

Step 1. Feel free to copy and modify the code from the previous exercise.
Step 2. Read the documentation https://reservation100-sandbox.mxapps.io/rest-doc/api#/reservations/post_reservations. Find out:

• which methods are available (GET or POST)
• what is the URL
• what headers are expected, and
• what should the request contain
  Step 3. Print the response

Hints:

• to set headers use fetch(<URL>, { headers: { 'XXXX': 'YYYY' } }
• the documentation at https://www.npmjs.com/package/node-fetch can be of great help

Do you know the game Cards against humanity. It's a game where players need to fill blanks in a sentence to make the funniest joke. For example, in the photo below

The resulting phrase reads as: Hope is a slipery slope that leads to a dissapointing birthday party.

Inspired by the game you want to write a node program that simulates playing the game.
The program needs to fill in the blanks in the phrase _______ is great to ________ and print the result to the console.

For the first blank select a random word from subjects = ["shark", "popcorn", "poison", "fork", "cherry", "toothbrush", "cannon"] For the second blank select a random word from punchlines = ["watch movie with", "spread some love", "put on cake", "clean toilets", "go to the moon", "achieve world piece", "help people learn programing"]

Use Handlebars to replace the blanks with a random word.

Step 1. Install and require handlebar (not express-handlebars, just handlebars)
Step 2. copy the subjects and punchlines to javascript
Step 3. write code that randomly picks asubject and punchline Step 4. replace the blanks in phrase with the random subject and punchline using handlebars

Hints:

• To get a random number between 0 and 6 use Math.floor(Math.random()*7)
• The documentation on handlebars has a nice example, check it out!

The code along section is designed to give you an idea of how different concepts fit together. You do not have to submit your code, but you have to finish the code along.

This time you will build an application that sends emails. I dont have to explain how important this is. Almost every web application needs to send emails. Emails are sent for example to verify users, to recover accounts, to notify users of events, etc. You will need all the skills you have learned so far, but I promise you that it will be a lot of fun.

Nodemailer - Send Emails From Your Node.js App

This week you'll finish HackYourTemperature. Inside the folder homework, create a new folder called hackyourtemperature.

This week we'll add our external API that we're going to work with: Open Weather Map. The goal this week is to learn how to use data from the frontend to use in an API call from the backend, and then to send the result back to the frontend.

1. We first have to make an account: do so via the website
2. Go back to your project folder and create a new folder called sources. Inside create a file called keys.json. Go to your OpenWeatherMap account, find the API Key and copy it into keys.json

1. First remove the response from last week
2. Inside of the the POST route, bring in axios and pass the value of the API endpoint: https://api.openweathermap.org/data/2.5/weather. For it to work we first have to add the API Key, like so:

const APIKEY = require('./sources/secrets.json').API_KEY;
axios(`https://api.openweathermap.org/data/2.5/weather?APPID=${API_KEY}`);

Now, there are 2 situations that could happen: if the city name is not found, we want to send to the client a response with a message that the city isn't found. However, if the city is found and then we want to return a message that contains the city name and current temperature.

3. If the result is not found, we render() to the page the index (just like in the / endpoint). However, also add a second argument, an object: { weatherText: "City is not found!" }
4. If the result is found, we also render() to the page the index. Also add here the object. Only, instead of just a string dynamically add in the cityName and temperature (gotten from the result of the API call). Hint: use template strings to add variables in your strings!

In the frontend we're going to add one thing:

1. Navigate to index.handlebars. Underneath the <form>, add a <p>. Give it the following content: {{ weatherText }} (Notice how the name weatherText refers back to the key in the object passed in the render())

Now test out your work to see if it behaves as expected. Run your server with node server.js. Open your browser at the right port and fill in the form. On submit there should appear a message underneath the form, that either says that the city isn't found or what the temperature is.

After you've finished your todo list it's time to show us what you got! Upload all your files to your forked repository (a copy from the teacher's). Then make a pull request to it.

If you need a refresher, take a look at the following guide to see how it's done.

The homework that needs to be submitted is the following:

1. Node.js exercises
2. Project: HackYourTemperature III

Deadline Saturday 23.59 CET