Need a clarification on router.param() usage. about express HOT 4 OPEN

Hi @kisshore04, can you post more clear code examples? Ideally a single file/code block which illustrates your setup in its entirety? These partial lines do not help anyone answer your question. If it turns out this is a bug or in need of better docs or something I will leave this open awaiting more information, but we do not provide technical support so if that is what you are looking for you might have better luck on StackOverflow or Reddit.

from express.

@kisshore04 have you tried router.param(‘department_id’)? Without the colon. https://expressjs.com/en/4x/api.html

from express.

@kisshore04 have you tried router.param(‘department_id’)? Without the colon. https://expressjs.com/en/4x/api.html

yeah i have always used router.param('department_id'); without the colon. I mistyped it in here.

from express.

Hi @kisshore04, can you post more clear code examples? Ideally a single file/code block which illustrates your setup in its entirety? These partial lines do not help anyone answer your question. If it turns out this is a bug or in need of better docs or something I will leave this open awaiting more information, but we do not provide technical support so if that is what you are looking for you might have better luck on StackOverflow or Reddit.

I apologize for the confusion in my previous message. Here is the revised version of the issue. I'm encountering an issue with the router.param function in Express.js. I have a setup where I'm expecting a callback function (myCallback) to be executed when there is a request to the route /api/department/:department_id/class/:id. However, during testing, I found that myCallback is not being invoked.

Here's the relevant code from app.js:

const express = require("express")
const app = express()

app.use("/api/department/:department_id/class", classRouter);
app.use("/api/department/", departmentRouter);

And from class-router.js:

const express = require("express")
const router = express.Router({mergeParams: true})

router.param("department_id", myCallback);

router.get("/:id", controllerFuntion)

Interestingly, in my department router where I have a similar setup, the middleware is executing successfully. The route to this is: /api/department/:department_id.

const express = require("express")
const router = express.Router({mergeParams: true})

router.param("department_id", myCallback);

router.get("/:department_id", getDeptDetails)

I've used the {mergeParams: true} option while creating the router and I have not used the colon (:) when I call the router.param() function.

Any help on why myCallback is not running when the request is coming to the nested route would be greatly appreciated.

from express.