Use switch case in node.js

I want to implement switch case for registration flow. Like normal sign up with

1. email, Phone number and password
2. with google
3. with facebook etc.

If user selects the continue with google button then switch to google registration and so on. How can I do that?

The controller file:

exports.register = catchAsync(async (req, res, error) => {
  try {
    const user = await userService.googleRegistration(req);
  } catch (error) {
    return res.failed(500, "Internal server error", error);
  }
});

The userService file:

// GOOGLE REGISTRATION
exports.googleRegistration = async (req) => {
  var google = require("googleapis").google;
  var OAuth2 = google.auth.OAuth2;
  var oauth2Client = new OAuth2();
  oauth2Client.setCredentials({ access_token: req.params.access_token });
  var oauth2 = google.oauth2({
    auth: oauth2Client,
    version: "v2",
  });
  oauth2.userinfo.get(async (err, res) => {
    if (err) {
    } else {
      let user_data = new User({
        first_name: res.data.given_name,
        last_name: res.data.family_name,
      });
      let user = await user_data.save();
      return user;
    }
  });
};

// NORMAL REGISTRATION
exports.register = async (user) => {
  let new_user = new User({ ...user });
  const user_data = await new_user.save();

  const payload = { id: new_user._id };
  user_data.JWToken = jwt.sign(payload, keys.JWToken, { expiresIn: 31556926 });

  return user_data;
};

>Solution :

I recomended use an des-structuct object. NOT recomended use a switch it is bad for the memory and performance

const typeSingIn = {
 facebook: function(){ /* function to join with fb */},
 google: function() {/* your function to join with google*/},
 // more options
}

app.post("/singIn", (req, res) => {
 const {method} = req.body // expect the answer if the signIn is for fb, google or other method.
 const singInType = typeSignIn[method]
 try{
  signInType() // this can be a promise if you want it
 }catch(e){
  res.json({status: 500, message: e})
 }
})