404 page for dynamic routes

[terse cargo]

I am currently using app router and am trying to make dynamic routes based off of a list of files. How can I make it so if none of the urls (which would be the same as the file name) match any files, it would be a 404 page not found?

[hard trout]

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[vivid scroll]

@terse cargo the 404 page is shown by default if someone navigates to a route that does not exist

[terse cargo]

im using a dynamic page though so technically every route would exist for the page directory

[vivid scroll]

@terse cargo you would have to check if it exists, ideally by calling an API route, and if it doesn't, push the error page to the router