Trying to get current logged in user tasks in Nodejs and MongoDB - node.js

Question

I'm working on a project that enables the admin to assign tasks to different users, every users should only see his own tasks.
I tried doing that by using the user.id as key, when the user logs in we send a token, and that token includes the user_id and other user info, I'm trying to extract the id from that token and view tasks based on that.
Tasks Model
const TaksSchema = new Schema({
user: {
type: mongoose.Schema.Types.ObjectId,
ref: 'users',
},
taskName: {
name: String,
},
taskDesc: {
name: String,
},
dateAssigned: {
type: Date,
default: Date.now,
},
requiredDate: {
type: Date,
},
completed: { type: Boolean, default: false },
});
// Export Schema
module.exports = Tasks = mongoose.model('tasks', TaksSchema);
User model
const UserSchema = new Schema({
name: {
type: String,
required: true,
},
email: {
type: String,
required: true,
},
password: {
type: String,
required: true,
},
role: {
type: String,
enum: ['basic', 'admin'],
default: 'basic',
},
avatar: {
type: String,
},
date: {
type: Date,
default: Date.now,
},
});
// Export Schema
module.exports = User = mongoose.model('users', UserSchema);
tasks route
router.get('/', (req, res) => {
const errors = {};
Tasks.findOne({ user: req.user.id })
.populate('user', ['name', 'avatar'])
.then((task) => {
if (!task) {
errors.notask = "There's no Tasks Right Now";
return res.status(400).json(errors);
}
res.json(task).catch((err) => res.status(404).json(err));
});
});
When I try sending the get request from postman I get this error
TypeError: Cannot read property 'id' of undefined
For security I'm sending the Id through JWT token.
Here is the code
const payload = { id: user.id, name: user.name, avatar: user.avatar }; // Create jwt patload
// Sign the token
jwt.sign(
payload,
keys.secretOrKey,
{ expiresIn: 3600 },
(err, token) => {
res.json({ sucess: true, token: 'Bearer ' + token });
}
);

Answer 1

You must first verify/decode the ID in order to receive the payload.
In the code, you are trying to access the id field from user. Actually you need to add a middleware which validates the JWT and appends the result in the user field.
Example :
middlewares/validateJwt.js
Assuming you are sending JWT in the header as Bearer Token.
try{
let token = req.headers.authorization.split(" ")[1]; // Bearer <token>
let result = jwt.verify(token, "JWT_SECRET", options);
req.user = result;
next();
} catch...

Answer 2

Your API should look like
GET /api//users/:id
In that case you can use
req.params.id
as a first argument.

Answer 3

Pranesh A S's answer should get you going. To complete his suggestion, if you store the middleware validateJWT.js as
const jwt = require("jsonwebtoken");
module.exports = function (req, res, next) {
const token = req.header("x-auth-token");
if (!token) {
res.status(401).json({ msg: "NO token. Auth Failed" });
}
try {
console.log(token);
const decoded = jwt.verify(token, "Secret key");
req.user = decoded.user;
next();
} catch (err) {
console.log(err);
res.status(401).json({ msg: "Token is not valid" });
}
};
import it in your App.js file and while defining routes,
use
const validateJWT =require ("./middleware/validateJWT")
and
app.get("/", validateJWT, (req, res)=>{
// do stuff
})