I can never remember how to actually to error checking with fetch. Maybe I'm just slow.

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  async function serverDown() {
      try {
          return fetch( "http://localhost:1234" )
              .catch( (e) => {
                  console.log( "Promise error" );
                  console.log(e);
              })
      } catch( e ) {
          console.log( "Exception error" );
          console.log( e );
      }
  }

  console.log( "Starting" );
  await serverDown();
  console.log( "Done" )

To explore:

1

  npx live-server

And if you open the console:

A more detailed walk through can help you figure out what style works better for you.