Aync / await func and regarding postman request

i am trying to send signup request from postman but i am not getting response .

 exports.signup = async function (req, res, next) {
    try {
        let user = await db.User.create(req.body); // i am stuck here
        let { id, username, profileImageUrl } = user;

        let token = jwt.sign({
            id,
            username,
            profileImageUrl
        }, process.env.SECRET_KEY);

        return res.status(200).json({
            id,
            username,
            profileImageUrl,
            token
        });

    } catch (err) {
        //if a validation fails!
        if (err.code === 11000) {
            err.message = "Sorry , that username and/or email is taken";
        }
        return next({
            status: 400,
            message: err.message
        });
        //see what kind of error
        //if it is a certain error
        //respond with username/email already taken
        //otherwise just send back a generic 400
    }
};