How to solve Mongoose Error on Validation - node.js

Question

I am building an API that allows the user to log certain data into the database(MongoDB) The problem is I keep getting the following errors:
UnhandledPromiseRejectionWarning: ValidationError: item validation failed: productName: Path `productName` is required.
here is my schema :
const mongoose= require('mongoose');
const Schema = mongoose.Schema;
//create Schema
const ItemSchema = new Schema({
productName : {
type : String,
required:true
} ,
description : {
type :String,
default:true
},
supplier : {
type :String,
default:true
},
price : {
type :Number,
default:true
},
date : {
type :Date,
default:Date.now
}
});
module.exports=Inventory=mongoose.model('item',ItemSchema,'inventory');
Here is the submit post route:
const express= require('express');
const router = express.Router();
//Items model
const Inventory = require('../../../models/Inventory');
router.post('/',(req,res)=>{
const newInventory= new Inventory({
productName:req.body.productName,
description:req.body.description,
supplier:req.body.supplier,
price:req.body.price,
});
newInventory.save().then(item=>res.json(item))
});
I can't figure out why it's throwing a validation Error!

Answer 1

This was the step I took to resolve the problem
first, i checked what i was getting from my req.body
const express= require('express');
const router = express.Router();
//Items model
const Inventory = require('../../../models/Inventory');
console.log(req.body) //checking for content of req.body
router.post('/',(req,res)=>{
const newInventory= new Inventory({
productName:req.body.productName,
description:req.body.description,
supplier:req.body.supplier,
price:req.body.price,
});
newInventory.save().then(item=>res.json(item))
});
I got an empty object { }, this means I wasn't getting any request in the first place. Testing with Postman, I changed the option from "form data" to :
x-www-form-urlencoded
this filled my req.body with data and the error disappeared !