I have been following this guide - How to use MongoDB Client-Side Field Level Encryption (CSFLE) with Node.js/ to test out the MongoDB CSFLE.

In doing so, in the step of creating the data key in local key vault store https://developer.mongodb.com/how-to/client-side-field-level-encryption-csfle-mongodb-node/#create-a-data-key-in-mongodb-for-encrypting-and-decrypting-document-fields the data key successfully is created but the keyAltName is not attached to the data key’s document.

I tested this multiple times and there is nothing wrong in my code and I’m following the guide as it is. I can’t understand what is causing this issue. The data key creation is successful but without the keyAltNames field. A help here would be really appreciated.

The code related to Data Key Document Creation

async findOrCreateDataKey(client) {
      const encryption = new ClientEncryption(client, {
      keyVaultNamespace: this.keyVaultNamespace,
      kmsProviders: this.kmsProviders
      })

      await this.ensureUniqueIndexOnKeyVault(client)

      let dataKey = await client
      .db(this.keyDB)
      .collection(this.keyColl)
      .findOne({ keyAltNames: { $in: [this.keyAltNames] } })

      if (dataKey === null) {
        dataKey = await encryption.createDataKey("local", {
           keyAltNames: [this.keyAltNames]
        })
        return dataKey.toString("base64")
      }
      return dataKey["_id"].toString("base64")
   }
}

Resulting Document

Package JSON MongoDB Driver/ MongoDB Client Side Encryption NPM Package Versions

"mongodb": "^3.6.0",
"mongodb-client-encryption": "^1.2.1"