Encountered a problem when trying to import the function "createToken" into a Node.js middleware

I have developed a model called users in which I included a method named generateToken for generating web tokens. This model is being used with the Sequelize ORM.

module.exports = (sequelize, Sequelize) => {
    const Tutorial = sequelize.define("users", {
        age: {
            type: Sequelize.INTEGER
        },
        name: {
            type: Sequelize.STRING
        },
        email: {
            type: Sequelize.STRING
        },
        password: {
            type: Sequelize.STRING
        }
    });

    Tutorial.generateToken = async function () {
        try {
            const token = jwt.sign({ _id: this.id }, "ThisIsTaskApp")
            console.log(token)
        }
        catch (error) {
            response.send('there is an error' + error)
            console.log('there is an error' + error)
        }
    }
    return Tutorial;
};

My goal is to create a web token when a user's email and password match. To accomplish this, I am utilizing the generateToken method but encountering an issue.

TypeError: user.generateToken is not a function

I suspect there might be an error related to importing the generateToken function in JavaScript.

const jwt = require('jsonwebtoken')
const user = db.users;
const generateToken = require('./models/users')
app.post('/login', async (req, res) => {
    try {
        var email = req.body.email;
        var password = req.body.password;
        await user.findOne({ where: { email: email, password: password } })
            .then(user => {
                if (user === null) {
                    res.status(404).json({
                        message: 'Auth Failed'
                    })
                }
                else {
                    const token = user.generateToken()
                    res.status(200).json(user)
                }
            })
    }

    catch (error) {
        console.log(error)
        return res.json({ 'status': 400 })
    }
})

I seek assistance in resolving this issue and successfully generating web tokens.

Answer №1

Consider utilizing

generateToken.generateToken()

at that location rather than

user.generateToken()

This is because you are essentially exporting the user model into the generate token variable, making the function accessible from that variable instead of the user variable.

Answer №2

Your code is experiencing an async-related issue. Please consider using the following updated version

const users = db.users;

app.post("/login", async (req, res) => {
  try {
    var email = req.body.email;
    var password = req.body.password;
    const userData = await users.findOne({ where: { email: email, password: password } });

    if (!userData) {
      return res.status(404).json({
        message: "Authentication Failed",
      });
    }

    const token = await userData.generateToken();
    console.log("🚀 ~ token", token)
    return res.status(200).json(userData);
  } catch (error) {
    console.log(error);
    return res.json({ status: 400 });
  }
});

Answer №3

In order to properly implement authentication, it is essential to include jsonwebtoken in both the /models/users file and the corresponding route handler.

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