How to catch 404 error?

[mgso]

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Description

I used express-jwt and set some routes. But when i visit a path that not in my routes. It get a 'UnauthorizedError'. But it should be 404 .

Reproduction

app.use(expressJwt({
    algorithms: ['HS256'],
    secret: "secret12345",
    requestProperty: 'authorization'
}).unless({
    path: ["/", "/login"]
}));
app.use(express.static('./'))

//api/v1/login
app.post('/login', function (req, res) {
    res.json({
        status: 'ok',
    })
})
app.get('/list', function (req, res) {
    res.json({
        status: 'ok',
    })
})
app.get('/', (req, res) => res.send('Hello World!'))

// When visit /xxxxx ,how to catch 404 error not UnauthorizedError
/*
app.use((err, req, res) => {
    res.sendStatus(404);
})
*/

app.use(function (err, req, res, next) {
    if (err.name === 'UnauthorizedError') {
        res.json({
            message: 'xxxxx',
            code: 401
        })
        return
    }
    res.status(err.status || 500);
    res.render('error');
});
`

### Environment

> Please provide the following:

- **Version of this library used: 6.0.0
- **Version of the platform or framework used, if applicable: express
- **Other relevant versions (language, server software, OS, browser):windows
- **Other modules/plugins/libraries that might be involved:express