Custom 404 on Vercel

Just add this to your vercel.json file to define your custom 404 page

{
  "version": 2,
  "routes": [
    { "handle": "filesystem" },
    { "src": "/(.*)", "status": 404, "dest": "/404.html" }
  ]
}

We are using this exact file for this blog that is made with Contentz, a static site generator, that already generates a /404.html file.

Now if you try to go to any other route you get that 404 error page. E.g. https://www.cristianbgp.com/asdf and it just works 🎉