UserSchema is missing "_id"

[spratap124]

UserSchema is missing "_id" key thus it is throwing error while creating the new user.

please modify the UserSchema like below:

    var UserSchema = new Schema({
  _id:{
    type:String
  },
  email: {
    type: String, required: true,
    trim: true, unique: true,
    match: /^\w+([.-]?\w+)*@\w+([.-]?\w+)*(\.\w{2,3})+$/
  },
  firstName: {type: String},
  lastName: {type: String}
});