mongodb list top collections size

gistfile1.txt

function getTopCollectionSizes(limit = 10) {
    let counter = 0;

    db.getCollectionNames().map(function(name) {
        let collectionStats = db.getCollection(name).stats();
        let sizeInMB = (collectionStats["size"] / (1024 * 1024)).toFixed(2); // Convert bytes to megabytes
        let storageSizeInMB = (collectionStats["storageSize"] / (1024 * 1024)).toFixed(2); // Convert bytes to megabytes

        return {
            "name": name,
            "size": sizeInMB,
            "storageSize": storageSizeInMB
        };
    }).sort(function(a, b) {
        return b["size"] - a["size"];
    }).forEach(function(x) {
        if (counter < limit) {
            let pad = "                       ";
            print(x.name + pad.slice(0, Math.max(24 - x.name.length, 0)) +
                "Size: " + x.size + " MB\t" +
                "Storage Size: " + x.storageSize + " MB");
            counter++;
        }
    });
}

getTopCollectionSizes();