Express app returns "Cannot GET /" on routing with query parameters

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I'm trying to write the very simple nodejs express application, but it fails on routing request with query parameters. Here is a a very short code:

const express = require('express');
const app = express();

app.get('/', (req, res) => {
    res.send('hello express');
});
app.get('/user/:id', (req, res) => {
    res.send(req.params.id);
});

app.listen(3000, () => {
    console.log('Start listening at 3000');
});

The second GET expects something like /user/1, /user/arup etc. The :id has to be replaced by something and it is required part of the url. That is why only /user gives you 404. This is called dynamic url.

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The route /user/:id is not expecting query parameters but rather route parameters. Meaning it is expecting /user/4384 not /user?id=4384

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You should try:
app.get('/user' && id, (req, res) => {
res.send(req.params.id);
});

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