Nodejs pass variable from router file to another router file - node.js

Question

i need to pass a variable called path from router file lessonsRouter.js to another router file lessons.js
My folder structure
routes
|
+--lessons.js
|
+--lessonsRouter.js
lessonsRouter.js
const router = require('express').Router();
const lessons = require('./lessons');
router.get('/*/([A-Z][a-z]+)/README.md', (req, res) => {
const path = req.url; // the variable that i need to pass to lessons.js router
// ignore next three lines
const pathSeparate = req.url.split('/');
const LessonTopic = pathSeparate[1].toLowerCase()
const LessonName = pathSeparate[2].match(/[A-Z][a-z]+/g).join('-').toLowerCase();
res.locals.path = path;
res.redirect(`/lessons/${LessonTopic}/${LessonName}`);
});
router.use('/:topic/:name', lessons);
module.exports = router;
lessons.js
const router = require('express').Router();
router.get('/', (req, res) => {
// i want to use variable path from lessonsRouter.js here
});
module.exports = router;

Answer 1

I would argue that you have your dependency/import direction wrong. lessons should import from lessonsRouter. But if you really want it this way, then you can export a function to which you can pass the path once you have it.
lessonsRouter.js
const lessons = require('./lessons');
router.get('/*/([A-Z][a-z]+)/README.md', (req, res) => {
const path = req.url; // the variable that i need to pass to lessons.js router
lessons(path);
...
});
lessons.js
module.exports = (path) => {
router.get('/', (req, res) => {
console.log(path);
});
};