what's bodyParser() and CookieParser

Question

wht's the role of app.use(bodyParser.json()); app.use(bodyParser.urlencoded());

and what's the difference between bodyParser() and CookieParser()

Answer 1

body-parser is a body parsing middleware, which populates the req.body with (for example) the value of the parametres of a POST.

cookie-parser parses cookies and populates req.cookies with objects bidden to cookie names.

Answer 2

bodyParser.json() - a middleware used for going over POST request data, parse it into json on put it on req.body.

cookieParser() - a middleware that parse cookie header and populate req.cookies