fallback:true as check for custom 404

[ashx404]

Can fallback:true be used as a check to determine whether the router exists or not. So if isFallback is true. I can conditionally render Page doesnt exists or something else. Is this correct according to the good practices?
I tried it, it works but the code for content page also runs as
if(router.isFallback){
return

404

}
else{

CONTENT

} I am not passing any staticProps so it is giving an error.

[bscaspar]

Hey @ashx404, the page will automatically return a 404 for routes that don't exist if you use fallback: false. You can check out the documentation here.

If the route doesn't exist it will render the Next 404 page. To customize this page you can create your own at pages/404.js