pass url params to child router express

To pass URL parameters to a child router in Express, you can follow these steps:

1. First, you need to define the child router in your main Express application. This can be done using the express.Router() method, like this:

const childRouter = express.Router();

1. Next, you can define the route within the child router that will handle the URL parameters. For example, if you want to handle a route like /users/:id, you can use the params property of the req object to access the parameter value. Here's an example:

childRouter.get('/users/:id', (req, res) => {
  const userId = req.params.id;
  // Do something with the userId
});

1. Once you have defined the child router and the route that handles the URL parameters, you need to mount the child router to the main Express application. This can be done using the app.use() method. Here's an example:

app.use('/api', childRouter);

In this example, the child router is mounted at the /api path. So, any routes defined within the child router will be relative to that path.

That's it! Now, when a request is made to a URL that matches the route defined within the child router, the parameter value will be accessible through the req.params object.

I hope this explanation helps! Let me know if you have any further questions.