Routing in NodeJs - node.js

Question

I am working on an eCommerce application, and I am trying to save users in my database but when I hit the API in the postmen then instead of :
res.json({
name: user.name,
email: user.email,
id: user._id
});
});
**instead of this code following code is running
user.save((err, user) => {
if (err) {
return res.status(400).json({
err: "NOT able to save user in DB"
});
}
//the complete code of my "auth.js" file is as following:
const User = require("../models/user");
exports.signup = (req, res) => {
const user = new User(req.body);
user.save((err, user) => {
if (err) {
return res.status(400).json({
err: "NOT able to save user in DB"
});
}
res.json({
name: user.name,
email: user.email,
id: user._id
});
});
};
exports.signout = (req, res) => {
res.json({
message: "User signout"
});
};
///and the complete code of my user model file is as following:
var mongoose = require("mongoose");
const crypto = require("crypto");
const uuidv1 = require("uuid/v1");
var userSchema = new mongoose.Schema(
{
name: {
type: String,
required: true,
maxlength: 32,
trim: true
},
lastname: {
type: String,
maxlength: 32,
trim: true
},
email: {
type: String,
trim: true,
required: true,
unique: true
},
userinfo: {
type: String,
trim: true
},
encry_password: {
type: String,
required: true
},
salt: String,
role: {
type: Number,
default: 0
},
purchases: {
type: Array,
default: []
}
},
{ timestamps: true }
);
userSchema
.virtual("password")
.set(function(password) {
this._password = password;
this.salt = uuidv1();
this.encry_password = this.securePassword(password);
})
.get(function() {
return this._password;
});
userSchema.methods = {
autheticate: function(plainpassword) {
return this.securePassword(plainpassword) === this.encry_password;
},
securePassword: function(plainpassword) {
if (!plainpassword) return "";
try {
return crypto
.createHmac("sha256", this.salt)
.update(plainpassword)
.digest("hex");
} catch (err) {
return "";
}
}
};
module.exports = mongoose.model("User", userSchema);
SO please anyone tell me how to solve this problem while hiting this code to api mongo shell is also opend and mean while i also keep ROBO3T connected.