Using SWR you might have this problem: you want to do the request only if you have some data.
For example, one case I had was, I had to figure out if the user was logged in before sending a request to a /api/user
endpoint to get the user’s data.
In particular, I had a session
object, and inside it, a user
object. Both needed to be defined.
So here’s what I did:
import fetcher from 'lib/fetcher'
...
const { data: userData } = useSWR(session && session.user ? `/api/user` : null, fetcher)
The first parameter is the URL. If it’s null
, then SWR does not perform the request, and solves the original problem.