function handleError(req, res, err) {
    switch (err.name) {
      case 'NotFoundError':
        render(req, res, 'error', err, {status: 404});
        break;
      default:
        render(req, res, 'error', err, {status: 500});
    }
  }
function handleError(req, res, err) {
    switch (err.name) {
      case 'NotFoundError':
        render(req, res, 'error', err, {status: 404});
        break;
      default:
        render(req, res, 'error', err, {status: 500});
    }
  }
function handleError ( req , res , err ) { switch ( err . name ) { case 'NotFoundError' : render ( req , res , 'error' , err , { status : 404 } ) ; break ; default : render ( req , res , 'error' , err , { status : 500 } ) ; } }
Render an error page
Render an error page