express()

Question 1

once imported how do you start express?

Answer 1

const app = express();

Question 2

how do you add a middleware?

Answer 2

app.use((req, res, next) => {
     // ... code here
     next();   // to pass to the next middleware
}

Question 3

how do you build your response i the last middleware?

Answer 3

res.send(‘<h1>ha ha</h1>

Question 4

what is the function that express has that simplifies routing? how does it work?

Answer 4

express.Router();
creas por ejemplo una function router = express.Router(); then le adicionas los .use , .get or .post que quieras , lile router.get or router.post(‘/’, (req, res, next) => {} y salvas esa funcion en un file aparte, por ejemplo admin.js y luego la exportas . then en tu app.js la importas en app.js y se la puedes poner en app.js como app.use(adminRouter); o sea se la pasas a app.use() como cualquier otra middleware function

Question 5

como haces que un middleware sea solo de get y de post

Answer 5

app.use no. usa app.get or app.post

Question 6

como haces el manejo del body parser

Answer 6

npm install body-parser --save
const bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({extended:false}));

Question 7

how do you set the statusCode in express?

Answer 7

res.status(404).send(‘’);

Question 8

how redirect in expressjs

Answer 8

res.redirect(‘/’);

Question 9

how to prepare a 404 message ?

Answer 9

ponlo en el last middleware, pasale el 404 de status y un mensaje

Question 10

como se devuelve un file en el response object?

Answer 10

res.sendFile(filePath);

Question 11

variable that gives you the filename of the current module that is running?

Answer 11

process.mainModule.filename

Question 12

what is a static resource?

Answer 12

a file or resource not managed by the routing system but by the file system directly

Question 13

how do you add a static folder to your project?

Answer 13

through a new middleware, and passing express.static() and passing a path to standard public folder

Question 14

when a static folder is added to your project, your link in css and any other path that will use this feature must use an absolute or relative path?

Answer 14

relative, i.e., from public folder in, e.g.,

Question 15

is the match exact in app.get and app.post or just partial match? and with app.use

Answer 15

exact. with use is partial