401: unauthorized (it contains bearer token) - authorization

Question

Login module is working and creating users with token 201 created
Receipts route had worked with the same code before but now response is 401
using Postman (Authorization & Bearer: xcvbnm) has been put
Here is my code
server.js
const express = require('express')
require('./db/mongoose')
const userRouter = require('./routes/user')
const receiptRouter = require('./routes/receipt')
const app = express()
const port = process.env.PORT || 4003
app.use(express.json())
app.use(userRouter)
app.use(receiptRouter)
app.listen(port, () => {
console.log('Server is up on port ' + port)
})
const Receipt = require('./models/receipt')
const User = require('./models/user')
Receipts Route
router.post('/receipts', auth, async (req, res) => {
const receipt = new Receipt({
...req.body,
owner: req.user._id
})
try {
await receipt.save()
res.status(201).send(receipt)
} catch (e) {
res.status(400).send(e)
}
})
Receipt Schema
const Receipt = mongoose.model('Receipt', {
description: {
type: String,
required: true,
trim: true
},
})
Auth module
const auth = async (req, res, next) => {
try {
const token = req.header('Authorization').replace('Bearer', '')
const decoded = jwt.verify(token, 'Mango#123')
const user = await User.findOne({ _id: decoded._id, 'tokens.token': token })
if (!user) {
throw new Error()
}
req.token = token
req.user = user
next()
} catch (e) {
res.status(401).send({ error: 'Please authenticate.' })
}
}