mongodb bulk import nested array of objects with new ObjectId

bulk-import.js

const { MongoClient, ObjectID } = require("mongodb");

// Replace the uri string with your MongoDB deployment's connection string.
const uri = "MONGODB URI";

const client = new MongoClient(uri);

const data = {/** data you want to import */}

function addObjectIdToArrayItems(target) {
    if (Array.isArray(target)) {
        target.forEach(addObjectIdToArrayItems);
    }
    else if (target.toString() === '[object Object]') {
        target._id = ObjectID()
    }

    if(target.children){
        addObjectIdToArrayItems(target.children)
    }
}

const dbName = 'myDB'
const collectionName = 'myCollection'

async function run() {
    try {
        await client.connect();

        const database = client.db(dbName);
        const collection = database.collection(collectionName);

        addObjectIdToArrayItems(data)

        const result = await collection.bulkWrite([
            {
                insertOne:
                {
                    "document": data
                }
            }
        ]);

        console.log(result);

    } finally {
        await client.close();
    }
}
run().catch(console.dir);