i'm new to nuxt3 and i don't understand the role (use) of key option in useFetch composable
it says ;
/*
key: a unique key to ensure that data fetching can be properly de-duplicated across requests
if not provided, it will be generated based on the url and fetch options
*/
can someone give a simplified idea) thanks in advance
The biggest clue is in comment you posted. The key word is de-duplicate/d
/ (diːˈdjuːplɪˌkeɪt) / verb. (tr) computing to remove (duplicated material) from a system.
So it is used to prevent the data from being fetched more than once between the server and client as part of the Hydration.
I believe but stand to be corrected that when hydrating a server-rendered page the key is used to map the result of the server-side to the client-side component data.