postman does not store value

So I am trying to enter a post using postman into a mongo db server but my post just returns empty. When I look into my server nothing has been entered and there is no error

table:

const mongoose = require('mongoose');

//Schema describes how our data looks
const PostSchema = mongoose.Schema({
    fullName: {
        type: String,
        required: true,
    },
    date_created: {
        type: Date,
        default: Date.now
    },
    id: {
        type: Number,
        required: true
    }
});

module.exports = mongoose.model('customer', PostSchema);

Route file

const express = require('express');
const router = express.Router();
const customer = require('../models/customer')
router.post('/', async (req,res) => {
const post = new customer({
    fullName: req.body.fullName,
    id: req.body.id
});
try{
    const savedCust = await customer.save();
    res.json(savedCust);
} catch (err) {
    res.json({message: err});
}
});

module.exports = router;

This is what I submit on postman:

{
    "fullName" : "Joy Robinson",
    "id": 2397
}

And this is the response that I get back:

{
    "message": {}
}