Developing Back-End Apps with Node.js and Express

From IBM on Coursera

In this final project, we will build a server-side online book review application and integrate it with a secure REST API server which will use authentication at session level using JWT. You will then test your application using Promises callbacks or Async-Await functions.

Tasks assessed by a screenshot

Results

Screenshots of tasks 1 to 9

Try it yourself

npm install

npm start

Testable locally via CLI

Get the book list available in the shop

curl -i localhost:5000/

Get the books based on ISBN

curl -i localhost:5000/isbn/1

Get all books by the author

curl -i localhost:5000/author/Unknown

Get all books based on title

curl -i localhost:5000/title/Fairy%20tales

Get a book review

curl -i localhost:5000/review/6

Register new user

curl --header "Content-Type: application/json" \
    --request POST \
    --data '{ "username":"john", "password":"fake" }' \
    localhost:5000/register

Login as a registered user

curl --header "Content-Type: application/json" \
    --request POST \
    --data '{ "username":"john", "password":"fake" }' \
    localhost:5000/customer/login

Testable via Postman

For this part it is necessary that the app is accessible from the Internet via the free Postman account that you have created, since curl cannot access req.session from CLI

Add/modify a book review

PUT <labURL>/customer/auth/review/1?review=good

Delete book review added by that particular user

DELETE <labURL>/customer/auth/review/1

Tasks that only offer text fields for evaluation

Get all books – Using async callback function

// Example tested successfully (but not kept in general.js)

public.get('/', async function(req, res) {
    return await search('/', null, res)
});

Search by ISBN – Using Promises

// Example tested successfully (but not modified in general.js)

public.get('/isbn/:isbn', function(req, res) {
    const request = new Promise((resolve) => {
        (async function(){
            const response = await search('isbn', req.params['isbn'], res);
            resolve(response)
        })()
    });
    request.then(result => { return result })
});

Previous methods use my search function below covering public requests

db connection not provided in the course

function search(col, it, res) {
    if (col === '/') return res.status(200).json({ books: db });
    else if (col === 'review' && db.hasOwnProperty(it))
        return res.status(200).json(db[it].reviews);
    else {
        let result = {};
        if (col === 'isbn') Object.keys(db)
            .filter(id => String(id).indexOf(it) > -1)
            .forEach(id => result[id] = db[id])
            ;
        else {
            for (const id in db) {
                if (Object.hasOwnProperty.call(db, id)) {
                    if (String(db[id][col]).indexOf(it) > -1) {
                        result[id] = db[id]
                    }
                }
            }
        }
        if (Object.keys(result).length)
            return res.status(200).json(result);
        else return res.status(404).json({ message: 'Not Found' })
    }
}

j5py / express