GET endpoint returns a 404 - node.js

Question

I am trying to retrieve specific user data from my Postgres DB.
This code, which retrievs all user data works:
app.get("/employees", async (req, res) => {
try {
const allEmployees = await pool.query("SELECT * FROM employees");
res.json(allEmployees.rows);
} catch (err) {
console.error(err.message);
}
});
But this code meant to retrieve one user doesn't. It returns a 404 on Postman.
app.get("/employees/:id", async (req, res) => {
try {
const { id } = req.params;
const oneEmployee = await pool.query("SELECT * FROM employees WHERE emp_id = $1", [
id
]);
res.json(oneEmployee.rows[0]);
} catch (err) {
console.error(err.message);
}
});
I don't seem to figure out what the problem is.

Answer 1

#AnujPancholi an update. I used the node-postgres queries documentation and changed my code as follows:
app.get("/employees/:emp_id", async (req,res) => {
const query = {
// give the query a unique name
name: 'fetch-user',
text: 'SELECT * FROM employees WHERE emp_id = $1'
}
query.values = [req.params.emp_id];
// callback
await pool.query(query, (err, response) => {
if (err) {
console.log(err.stack);
} else {
res.json(response.rows);
}
});
});
then on Postman my endpoint to a GET route
http://localhost:3000/employees/4
I did not enter any values on the params section. Thanks for pointing me in the right direction, especially on the Postman part.