What does `app.use(bodyParser.json())` do?

Question

For:

bodyParser.urlencoded({extended: ...})

my research shows me that if extended: true, then you can parse nested objects, or

Answer 1

Okay, contrary to what I previously thought, further research shows that extended: true and app.use(bodyParser.json()) can be used together. So it is not only extended: false that uses it. The statement app.use(bodyParser.json()) is to be used independently, whether you set extended as true or false.

• app.use(bodyParser.json()) basically tells the system that you want json to be used.

• bodyParser.urlencoded({extended: ...}) basically tells the system whether you want to use a simple algorithm for shallow parsing (i.e. false) or complex algorithm for deep parsing that can deal with nested objects (i.e. true).

Have a look at the docs (i.e. https://expressjs.com/en/guide/migrating-4.html) for the example.