Error: Cast to undefined failed for value undefined at path "undefined"

Question

I am a beginner JavaScript developer. I am getting this error when I try to get all soldiers by route: "localhost:3005/api/v1/soldiers" in POSTMAN.

In order to work on NodeJS with ES module imports, I did the following:

npm install --save-dev @babel/cli @babel/core @babel/node @babel/plugin-proposal-class-properties @babel/preset-env babel-loader

After that, a .balerc file was created at the root of the folder

server/.babelrc

{
  "presets": ["@babel/preset-env"],
  "plugins": ["@babel/plugin-proposal-class-properties"],
  "ignore": [
  ]
}

The next step was to create the nodemon.json file

server/nodemon.json

{
  "watch": [
    "src",
    ".env"
  ],
  "ext": "js,json",
  "ignore": [
    "src/**/*.spec.js",
    "src/**/*.test.js"
  ],
  "exec": "babel-node ./src/index.js"
}

After that I wrote Schema for HomePost, services, controllers and routes and used --> import mongoose from 'mongoose'. When sending any requests, everything worked fine. Find by ID, delete by ID, create home post, get home posts list. I started writing a similar schema, services, controllers and routes for soldiers.

models/sordier.model.js

import mongoose from 'mongoose'

const Soldier = new mongoose.Schema({
  title: {
    type: String,
    required: true
  },
  image: {
    type: String,
    required: true
  },
  rank: {
    type: String,
    required: true
  }, 
  status: {
    type: String,
    default: '1'
  },
  created_at: {
    type: Date,
    default: new Date()
  },
  updated_at: {
    type: Date,
    default: new Date()
  }
})

export default mongoose.model('Soldier', Soldier)

services/soldiers.service.js

export const getSoldiers = async ({
  offset = 0,
  limit = 9
}) => Soldier.find({}, null, {
  skip: parseInt(offset),
  limit: parseInt(limit)
})

api/soldiers/soldiers.controller.js

export const SoldiersListController = async (request, response, next) => {

  try {
    const { offset, limit } = request.query
    
    const soldiers = await getSoldiers({
      offset,
      limit
    })

    return response
      .status(200)
      .json({
        status: true,
        soldiers: Array.isArray(soldiers) 
          ? soldiers?.map(soldier => SoldiersListItemMapper(soldier)) 
          : []
      })
  } catch (error) {
    console.log(error);
    next(error)
  }
  
  return response
    .status(200)
    .json({
      success: true,
      data
    })
}

Using POSTMAN, I made sure that the function works: create a soldier, get one by ID, delete one by ID, but getting a list of soldiers does not work.

I am catching the error:

Error: Cast to undefined failed for value undefined at path "undefined"

Then in DEBUG CONSOLE I find:

/usr/local/bin/node ./server/src/models/soldier.model.js

Process exited with code 1
(node:72959) Warning: To load an ES module, set "type": "module" in the package.json or use the .mjs extension.
(Use `node --trace-warnings ...` to show where the warning was created)

Adding --> "type": "modules" to my package.json breaks all other imports in the application. I want to continue writing with ES module imports and not rewrite to --> const variable = require('path') <--

What can I do?