How to fix returning multiple same users in response in Nodejs?

How to fix returning multiple same users in response in Nodejs? When I currently use the API it's giving me multiple same users in response for example "there is only one user in the database MongoDB and that username is User1 so if I type U it gives User1 User1 User1 User1 User1 multiple times" How can I fix that? And only give one user instead of looping the same user multiple times?

router.post('/searchuser', (req, res) => {

    const { keyword } = req.body;

    if (!keyword) {
        return res.status(422).json({ error: 'Please Search A Username' });
    }

    User.find({ username: { $regex: keyword, $options: 'i' } })
        .then(user => {
            console.log(user);
            let data = [];
            user.map(item => {
                data.push({
                    _id: item.id,
                    username: item.username,
                    email: item.email,
                    profileImg: item.profileImg,
                    posts: item.posts,
                })
            })
            console.log(data);

            if (data.length == 0) {
                return res.status(422).json({ error: 'No User Found With This Keyword' });
            }

            res.status(200).send({ message: 'User Found', user: data });
        })
        .catch(err => {
            res.status(422).json({ error: 'Server Error' });
        })
});

Frontend:

 const [keyword, setKeyword] = useState("");
const [keyword, setKeyword] = useState("");

useEffect(() => {
    GetSearchedUser();
}, [keyword])

const GetSearchedUser = async () => {
    if (keyword.length === 0) {
        setData([]);
        setError(null);
        return;
    }
    setLoading(true);
    try {
        const res = await fetch('http://10.0.2.2:3000/searchuser', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({ keyword })
        });
        const { error, message, user } = await res.json();
        if (error) {
            setData([]);
            setError(error);
        } else if (message === 'User Found') {
            setError(null);
            setData(user);
        }
    } catch (error) {
        console.error(error);
        setData([]);
        setError(error.message);
    } finally {
        setLoading(false);
    }
};

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