How to Update User With JWT Token When he Tries To Login in Nodejs and Reactjs with MongoDB

I am trying to create a login functionality for my Reactjs Webiste using Nodejs express backend.

I want to set a JWT token when the user tries to log in and update that token in my mongoDB database and then verify the token on the frontend and save it to localStorage.

However, when the user tries to log in after registration, it returns back the result without the token, and thus not allowing the user to log in, unless he clicks the login button again, then my code would generate and update the user with the JWT token.

Why is this behavior happening? Why is the first response only returning the found user from the findOne() operation when i am resolving the result from the findOneAndUpdate operation?

Here is my code:

User Model:

login(params) {
  

    params.email = params.email.toLowerCase();

    return new Promise((resolve, reject) => {
      db.collection("Users").findOne({ email: params.email }).then((response) => {

          console.log(response)
          if(response) {
            bcrypt.compare(params.password, response.password, (err, success) => {
              if(success) {
                let token = jwt.sign({
                  name: response.name,
                  id: response._id
                }, proccess.env.JWT_SECRET);

                db.collection("Users").findOneAndUpdate({
                  email: params.email
                }, {
                  $set: { token: token, lastLogin: new Date() },
                }, function (e, s) {
                  if(e) {
                    console.log(e)
                    reject(e)
                  } else {
                    console.log("updated")
                    resolve(s)
                  }
                })
              } else {
                reject({msg: 'Incorrect email or password.'})
              }
            })
          } else {
  
            reject({msg: 'cannot log in user'});
          }

      })
    })
  }

UserController:

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

    let User = new models.User()
    let processes = [];
    processes.push(function (callback) {
        User.login(req.body).then(function (response) {
           
                callback(null, response);
        }, function (error) {
            console.log(error)
            callback(error);
        });
    });

    async.waterfall(processes, function (error, data) {
        if (!error) {
            return res.json({
                statusCode: 200,
                msg: 'User logged in successfully.',
                result: data
            });
        } else {
            return res.json({
                statusCode: 401,
                msg: 'Cannot login user.',
                error: error
            });
        }
    });

})

React Login.js:

const login = () => {
    axios.post('/login', data).then(async (response) => {
      console.log(response)
      if(response && response.data.result.value.token ) {
        localStorage.setItem("authUser", JSON.stringify(response.data.result.value.token))
        history.push("/")
        console.log(response.data.result)
      } else {
        console.log("ERROR")
      }
    })
  }

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