@_nswadhina said:
unable to fetch data
i am unable to fetch data from the api getting error----
Fetch failed: Error: HTTP error! status: 401
please help me out with this

Can you tell us which of these errors is occurring?
See the list of TMDb server error warnings here.
https://www.themoviedb.org/documentation/api/status-codes
In your case:

Code    HTTP    Message  

3       401     Authentication failed: You do not have permissions to access the service.
7       401     Invalid API key: You must be granted a valid key.
10      401     Suspended API key: Access to your account has been suspended, contact TMDb.
14      401     Authentication failed.
16      401     Device denied.
17      401     Session denied.
30      401     Invalid username and/or password: You did not provide a valid login.
31      401     Account disabled: Your account is no longer active. Contact TMDb if this is an error.
32      401     Email not verified: Your email address has not been verified.
33      401     Invalid request token: The request token is either expired or invalid.
34      401     The resource you requested could not be found.
35      401     Invalid token.
36      401     This token hasn't been granted write permission by the user.
38      401     You don't have permission to edit this resource.
39      401     This resource is private.  

API_KEY: undefined Request URL: https://api.themoviedb.org/3/trending/all/week?api_key=undefined&language=en-US&page=1 Fetch failed: TypeError: fetch failed actually i tested this api in postman it is working perfectly but when i am trying to fetch day through my code it is showing the above error

this is my api key--- NEXT_PUBLIC_API_KEY=9615f4f99d********

Well, in the text you pasted above:

API_KEY: undefined Request URL: https://api.themoviedb.org/3/trending/all/week?api_key=undefined&language=en-US&page=1

You can see that your API key variable is not working properly. The URL that is getting created has the API key as undefined.