gets undefined when i call my param in backend node controller - node.js

Question

Here is the request type:
interface IgetProductsByGenderRequest extends express.Request {
readonly params: Readonly<{ gender: string; }>;
}
When I'm using req.params.gender I get undefined.
When I'm using req.params I get the param but in object and I want to get it in a var.
My backend controller:
const getProductsByGender = async (
req: IgetProductsByGenderRequest,
res: IgetProductsByGenderResponse
) => {
console.log(req.params)
ServerGlobal.getInstance().logger.info(
`<getProductsByGender>: Start processing request filtered by and gender ${req.params.gender}`
);
if (
!ServerGlobal.getInstance().isValidGenderValue(+req.params.gender)
) {
ServerGlobal.getInstance().logger.error(
`<getProductsByGender>: Failed to get products because of invalid gender filtered by gender ${req.params.gender}`
);
res.status(400).send({
success: false,
message: "Please provide valid gender",
});
return;
}
try {
const products = await ProductDB.find({ gender: +req.params.gender });
ServerGlobal.getInstance().logger.info(
`<getProductsByGender>: Successfully got the products filtered by gender ${req.params.gender}`
);
res.status(200).send({
success: true,
message: "Successfully retrieved products",
data: products.map((product) => ({
id: product.id as string,
gender: {
value: product.gender,
label: ServerGlobal.getInstance().getGenderLabel(product.gender)!,
},
title: product.title,
description: product.description,
price: product.price,
imageFilename: product.imageFilename,
})),
});
return;
} catch (e) {
ServerGlobal.getInstance().logger.error(
`<getProductsByGender>: Failed to get products filtered by gender ${req.params.gender} because of server error: ${e}`
);
res.status(500).send({
success: false,
message: "Server error",
});
return;
}
};
How can I access the gender param?

Answer 1

I suggest reading the documentation regarding routing and regarding query parameters.
You have req.query, which is for query parameters, e.g. /some/path?myVariable=test would have req.query.myVariable === 'test'.
You also have req.params which is when you're using URL parameters, e.g. /some/path/:id would have req.params.id === 'test' when the user visits /some/path/test.
Make sure you are using/accessing the correct one, as it's easy to make mistakes in this regards. And of course watch out for typos, although you should've spotted that with your console.log(req.params) statement.