如何通过React中的axios get方法发送参数？

我有一个axios GET方法，我需要在get请求中传递参数。我这样在客户端（React.js）中调用GET方法，

    const [Cart] = useState([]);
    const user = {
        userId : session.userId
    };

    console.log(user);
    useEffect((user) => {
        if(session.userId !== null){

            //Axios.get('http://localhost:5000/api/cart/getCart', user) <- I tried both these ways
            Axios({
                method: 'GET',
                url: 'http://localhost:5000/api/cart/getCart',
                headers: {
                    'Content-Type': 'application/json',
                    'Accept': 'application/json'
                },
                data: {},
                params: {
                    "userId" : session.userId
                }
            })
                .then(res => {
                    const cart = res.data;

                    let tempProducts = [];
                    cart.data.forEach(item => {
                        const singleItem = {...item};
                        tempProducts = [...tempProducts, singleItem];
                    });

                    this.setState(() => {
                        return {Cart: tempProducts};
                    });

                })
        }
        console.log(Cart)
    });

但是在服务器端（node.js），它没有获取参数值。

router.get('/getCart', (req, res) => {

    console.log(req.body.userId) //This gives the output as undefined
    User.findOne({_id: req.body.userId}
    ,(err, userInfo) => {

       res.json(userInfo.Cart);

    })
});

I implemented the uncommented axios.get request by referring to this. Can you please help me to find the error? Or can you suggest me any other method to do this? Thanks