Hi,

Fetch promises only reject with a TypeError when a network error occurs. Since 4xx and 5xx responses aren't network errors, there's nothing to catch. You'll need to throw an error yourself to use Promise#catch.

A fetch Response conveniently supplies an ok , which tells you whether the request succeeded. Something like this should do the trick:

1fetch(url).then((response) => {2  if (response.ok) {3    return response.json();4  }5  throw new Error('Something went wrong');6})7.then((responseJson) => {8  // Do something with the response9})10.catch((error) => {11  console.log(error)12});

I can see that you are using Neon database. For specific Neon related implementation, you can also reach out to their Support team.