How to to access first and last name for the following user model (based on mongoose)?

In an express application request parameters are passed in as first parameter of a route (req, res, next). The sample code posted shows the result of a POST request to a route called /register.This data does not relate to the model posted with the question.

To be able to work with the model, the data needs to be stored into a new Mongoose object.So within the route one would write:

exports.register = function(req, res, next) {     const User = new User();    User.profile.firstName = req.body.firstName;    // ... and so on    User.save((err, savedUser) => {         if(err) return next(err);        // end request    });}

Please note that some kind of sanity check is recommended when dealing with user provided variables. Using it like in my example above may enable an attacker to store a string of arbitrary length inside the database which is most probably not desired.

As pointed out by @DanielKhan, within the above comments, mongoose is only being used to model the data. However, at this point, it has nothing to do with the data coming in directly from the client. Hence, all the fields, including email, password, and first name, and last name will be retrieved at the same level... using req.body.

req.body added by body-parser and this is not related to your mongoose model. You will get data in req.body sent from front-end(client side). Apart from this issue, I would like to recommend you to use following format that may help you

You may like to use schema for sub-document

var profileSchema = new Schema({   firstName: String,   lastName: String});var UserSchema = new mongoose.Schema({    email: {        type: String,        lowercase: true,        unique: true,        required: true    },    password: {        type: String,        required: true    },    profile: profileSchema});

and may use like

exports.register = function(req, res, next) {   if(!req.body)      return res.status(500).send({ error: 'Unable to parse data'});  // Check for registration errors  const userData = {    email: req.body.email,    password: req.body.password,    profile: {      firstName: req.body.firstName,      lastName: req.body.lastName    }  }  // Return error if no email provided  if (!userData.email) {    return res.status(422).send({ error: 'You must enter an email address.'});  }  // Return error if no password provided  if (!userData.password) {    return res.status(422).send({ error: 'You must enter a password.' });  }  // Return error if full name not provided  if (!userData.profile.firstName || !userData.profile.lastName) {    return res.status(422).send({ error: 'You must enter your full name.'});  }  var newUser = new User(userData);// you must import user schema before using User