Can't create multiple objects with MongoDB + Node - mongodb

Question

I am trying to create multiple objects with mongodb, mongoose and express (by using Insomnia). I have managed to create the first object, but when I try to create the following one it gives me the following error:
{
"success": false,
"message": {
"driver": true,
"name": "MongoError",
"index": 0,
"code": 11000
}
}
I tried to solve it by including different data in the object (although I didn't specify uniqueness in the properties), but it will throw the 11000 (duplicate key) error anyways.
The log of req.body returns { inmovilizadoInmaterial: 12, inmovilizadoMaterial: 13 } (as the data included for the registration are those values)
Here's the model
const mongoose = require("mongoose");
const { Schema } = mongoose;
const balanceSchema = new Schema(
{
inmovilizadoInmaterial: { type: Number, default: 0 },
inmovilizadoMaterial: { type: Number, default: 0 },
}
);
module.exports = mongoose.model("Balance", balanceSchema);
Here's the router that connects the model and the controller the object:
const express = require('express');
const router = express.Router();
const balanceController = require('../controllers/balance.controller');
router.post('/create', balanceController.create);
module.exports = router;
And finally here's the controller that has the function that creates the object.
const balanceController = {};
const Balance = require('../models/Balance')
balanceController.create = async(req,res)=>{
const balance = new Balance(req.body);
balance.save();
}
module.exports = balanceController;
I know it must be a very simple mistake but I'm very new to the technology.
Thank you very much in advance!

Answer 1

Can you try to change your controller like this:
balanceController.create = async(req,res)=>{
try {
console.log('Req body:', req.body);
const balance = await Balance.create(req.body);
res.status(200).json({success: true});
} catch(error) {
console.log('ERROR: ', error);
res.status(400).json({success: false, error});
}
}
Note that req.body will be logged so you can check whether your controller receiving correct data (maybe you are sending empty req.body from the frontend). Also error will be logged in. If this does not work, add both output of console.log(req.body) and console.log(error) to your question.