inserting data into mongodb using node js

I am on a computing course and have an issue trying to insert data into mongodb. we are using visual studio code and node js. When i post data using postman i dont get any return result and no data gets inserted into db. I have literally gone over the code a hundred times and the lecturer has even given me his code which mine matches. yet his gets a result and mine doesnt. we cannot go into university atm and i just cant get help online so have come here! can someone advise what is going wrong pls?

Here is my code:
app.js

const express = require('express')
const app = express()

const mongoose =require('mongoose')
require('dotenv/config')

const bodyParser = require('body-parser')
const postsRoute = require('./routes/posts')

app.use(bodyParser.json())
app.use('/posts',postsRoute)

app.get('/', (req,res) =>{
    res.send('Homepage')
})

mongoose.connect(process.env.DB_CONNECTOR, ()=>{
    console.log('DB is now connected!')
})

app.listen(3000, ()=>{
    console.log('Server is up and running...')
})

posts.js (Sits in the routes folder:

const express =require('express')
const router = express.Router()

const Post = require('../models/Post')

// POST (Create data)
router.post('/',async(req,res)=>{
    //console.log(req.body)

    const postData = new Post({
        user:req.body.user,
        title:req.body.title,
        text:req.body.text,
        hashtag:req.body.hashtag,
        location:req.body.location,
        url:req.body.url
    })
    // try to insert...
    try{
        const postToSave = await postData.save()
        res.send(postToSave)
    }catch(err){
        res.send({message:err})
    }
})

// GET 1 (Read all)
router.get('/', async(req,res) =>{
    try{
        const getPosts = await Post.find().limit(10)
        res.send(getPosts)
    }catch(err){
        res.send({message:err})
    }
})

// GET 2 (Read by ID)
router.get('/:postId', async(req,res) =>{
    try{
        const getPostById = await Post.findById(req.params.postId)
        res.send(getPostById)
    }catch(err){
        res.send({message:err})
    }
})

// PATCH (Update)
router.patch('/:postId', async(req,res) =>{
    try{
        const updatePostById = await Post.updateOne(
            {_id:req.params.postId},
            {$set:{
                user:req.body.user,
                title:req.body.title,
                text:req.body.text,
                hashtag:req.body.hashtag,
                location:req.body.location,
                url:req.body.url
                }
            })
        res.send(updatePostById)
    }catch(err){
        res.send({message:err})
    }
})

// DELETE (Delete)
router.delete('/:postId',async(req,res)=>{
    try{
        const deletePostById = await Post.deleteOne({_id:req.params.postId})
        res.send(deletePostById)
    }catch(err){
        res.send({message:err})
    }
})

module.exports = router

Post.js (data model) sits in the models folder:

const mongoose = require('mongoose')

const PostSchema = mongoose.Schema({
    user:{
        type:String,
        required:true
    },
    title:{
        type:String,
        required:true
    },
    text:{
        type:String,
        required:true
    },
    hashtag:{
        type:String,
        required:true
    },
    location:{
        type:String,
        required:true
    },
    url:{
        type:String,
        required:true
    },
    date:{
        type:Date,
        default:Date.now
    }
})

module.exports = mongoose.model('posts',PostSchema)

Here is the data format I am putting into postman :

{
“user”: “Safi”,
“title”: “mr”,
“text”: “Hello, this is my first message”,
“hashtag”: “#VideoGames”,
“location”: “london”,
“url”: “htpps://safi.com”
}

I am meant to get a response on postman with the data and a unique id. however nothing is returned and nothing is inserted into mongodb.

a JSON package is definitely being created as (even though it is commented out) I have a line //console.log(req.body) that when I “uncomment” it the terminal on VS shows the JSON data.

I have tried on another pc and get the same issue.