How to find path on express app for middleware

Question

So my router looks like this:

const app = express();
app.use('/login', router);

app.listen(3000, () => {
    app._router.stack.forEach((middleware: any) => {
     console.log(middleware);
    })
})

when I console .log that middleware I get:

Layer {
  handle:
   { [Function: router]
     params: {},
     _params: [],
     caseSensitive: undefined,
     mergeParams: undefined,
     strict: undefined,
     stack: [ [Layer] ] },
  name: 'router',
  params: undefined,
  path: undefined,
  keys: [],
  regexp:
   { /^\/login\/?(?=\/|$)/i fast_star: false, fast_slash: false },
  route: undefined }

Only part where I can see route path for the middleware is regexp but it is not easy to extract...

Any idea how can I get path from express app

score 0 · Answer 1 · answered Aug 11 '18 at 11:01

0

Looking at the constructor, the original path isn't retained anywhere.

answered Aug 11 '18 at 11:01

robertklep

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if i do like this: ```app.post('login', ...)``` it will return path: ```route: Route { path: 'login', stack: [ [Layer] ], methods: { get: true } } }```. You can try... But for ```app.use('login, ...)``` path not working. It must be some bug – Vladimir Djukic Aug 11 '18 at 11:04
@VladimirDjukic yes, but that `Route` instance isn't available in the `Layer` instance (`route: undefined`). – robertklep Aug 11 '18 at 11:11
What exactly is it that you want to do? – robertklep Aug 11 '18 at 11:32
1

I want to loop trought ```express()``` and get all full paths and methods – Vladimir Djukic Aug 11 '18 at 11:33
But to what purpose? – robertklep Aug 11 '18 at 11:33
To make easy validation and automatic API documentation npm pkg – Vladimir Djukic Aug 11 '18 at 11:34
Take a look at this module: https://github.com/ivanoff/express2md It can generate API documentation for an Express instance, so I assume that it has a way of determining the paths from the routes. – robertklep Aug 11 '18 at 11:38
It not using express Router. It creating routes directly on express instance – Vladimir Djukic Aug 11 '18 at 11:51

score 0 · Answer 2 · answered Nov 29 '19 at 12:07

app.js

const app = express();
const { getRoutes } = require('./utils/getRoutes');
getRoutes(app)

getRoutes.js

let counter = 0;
const getRoutes = (app) => {
    let routes = [];
    app._router.stack.forEach(function(middleware) {
        let regexp = middleware.regexp.toString();
        regexp = regexp.slice(3);
        const index = regexp.indexOf('/?(');
        regexp = regexp.slice(0, index - 1);

        if (middleware.route) {
            routes.push({ child: middleware.route.path, parent: regexp });
        } else if (middleware.name === 'router') {
            middleware.handle.stack.forEach(function(handler) {
                counter++;

                if (counter % 2 === 1) {
                    return;
                }
                route = handler.route;
                route && routes.push({ child: route.path, parent: regexp });
            });
        }
    });

    return routes
};

module.exports.getRoutes = getRoutes;

hope you will get all your register path

How to find path on express app for middleware

2 Answers2