How to define custom error page in loopback?

Question

I want to define custom 404 not found response pages with loopback. In documentation it's been given that loopback's middleware has been defined on express but i am not getting how to define custom error page in loopback.

Answer 1

Inside the middleware.json, remove the loopback#urlNotFound middleware from the final phase and update it with this:

"final": {
    "./middleware/url-not-found-handler": {}
},

Now, place the following content on the file server/middleware/url-not-found-handler.js

'use strict';
module.exports = function () {
    //4XX - URLs not found
    return function customRaiseUrlNotFoundError(req, res, next) {
        res.sendFile('path to 404.html', function (err) {
            if (err) {
                console.error(err);
                res.status(err.status).end();
            }
        });
    };
};