Cannot read properties of undefined in Nodejs - mysql

Question

I'm trying to do a sample register without JWT using MVC in nodejs, express and mysql so when I run my code and I have an error :
TypeError: Cannot read properties of undefined (reading 'firstName') at exports.register
here is my code :
AuthController
const AuthModel = require('../models/Auth')
// Create and Save a new User
exports.register = (req, res) => {
// Validate request
if (!req.body) {
res.status(400).send({
message: "Content can not be empty!"
});
}
// Create user
const user = new AuthModel({
firstName: req.body.firstName,
lastName: req.body.lastName,
email: req.body.email,
password: req.body.password
});
// Save user in the database
AuthModel.createUser(user, (err, data) => {
if (err)
res.status(500).send({
message:
err.message || "Some error occurred while registring."
});
else res.send(data);
});
};
AuthModel
const AuthModel = function(table){
this.firstName = table.firstName;
this.lastName = table.lastName;
this.email = table.email;
this.password = table.password;
}
AuthModel.createUser = ( newUser, result ) =>{
db.query("INSERT INTO users SET ?", newUser, (err, res) => {
if (err) {
console.log("error: ", err);
result(err, null);
return;
}
console.log("User are registed: ", { id: res.insertId, ...newUser });
result(null, { id: res.insertId, ...newUser });
});
};

Answer 1

It seems to me as if the req.body is undefined. I think you might need something like body-parser, which has been added into the core of Express starting with version 4.
Try adding this middleware to your entrypoint: app.use(express.json());
See more here: http://expressjs.com/en/api.html#express.json

Answer 2

In your exports.register, you .send() if the body is undefined. That doesn't mean the rest of the code won't be executed.
Replace:
res.status(400).send({
message: "Content can not be empty!"
});
by
return res.status(400).send({
message: "Content can not be empty!"
});