express-async-handler didn't give the exact form of error I want

[iamAravindks]

when I using the findById method defined by mongoose, I got a Cast error something like this

CastError: Cast to ObjectId failed for value "611411089cb0c839083962ba4" (type string) at path "_id" for model "Product"
    at model.Query.exec (/home/user/web/mern/emartwell/node_modules/mongoose/lib/query.js:4498:21)
    at model.Query.Query.then (/home/user/web/mern/emartwell/node_modules/mongoose/lib/query.js:4592:15)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)

But I need the product not found error.

Code

productRoute.js

import express from "express";
import asyncHandler from "express-async-handler";
import Product from "../models/productModel.js";

const router = express.Router();

router.get(
    "/:id",
    asyncHandler(async (req, res) =>
    {
        const product = await Product.findById(req.params.id);
        if (product)
        {
            res.json(product);
        } else
        {
            res.status(404).send({ message: "Product not found" });
        }
    })
);

export default router;

But using the below code gives the exact output I want

        try
        {
            const product = await Product.findById(req.params.id);
            res.json(product);
        } catch (error)
        {

            res.status(404).json({ message: "Product not found" })
        }

Please help me to get rid of this problem. Thanks in advance :D

[heidemn]

Your problem is entirely unrelated to this Github repo.

An ObjectId must be exactly 24 hex characters (or 12 bytes, in binary), but your string 611411089cb0c839083962ba4 has 25 characters. https://stackoverflow.com/questions/14940660/whats-mongoose-error-cast-to-objectid-failed-for-value-xxx-at-path-id

You could also implement a custom error handler that transforms the error to your desired response. http://expressjs.com/en/guide/error-handling.html#writing-error-handlers Could go approximately like this, haven't tested it:

app.use(function (err, req, res, next) {
  console.error(err.stack)
  if (err.message && err.message.includes('Cast to ObjectId failed')) {
    res.status(404).send({ message: "Product not found" });
  } else {
    res.status(500).send('Something broke!');
  }
})