php - Laravel returns a html page with data instead of a response json in my script.js

one text

I have to porting a php website in laravel and in my original website JavaScript file i call a fetch in a .php file of contents and return a json. In laravel call the fetch in a {{route('contents')}} and then in web.php i create the route Route::get("/contents","ContentsController@contents")->name('contents'). And so in ContentsController.php i create:

function contents(){
    $CONTENUTI=[
         ["title"=>"abc",
           "img"=>"https....",
           "Id"=>"01"],
         ["title"=>"def", 
           .....
          ];
     return response()->json($CONTENTS)

But in my website console there's this message:route('contents') 404 not found i try also with return $CONTENTS but it shows me a white page with the json and not in my view