Server error messages in Node.js

 //

app.use((err, req, res, next) => {

console.log(err);

err.statusCode = err.statusCode || 500;

err.status = err.status || 'error';

res.status(err.statusCode).json({

status: err.status,

message: err.message,

}); // {"status":"fail","message":"Page / not found!"}

next();

});

//