Azure Cosmos DB for NoSQL in Node.js: @azure/cosmos with identity
```js
import { CosmosClient } from "@azure/cosmos";
import { DefaultAzureCredential } from "@azure/identity";
const client = new CosmosClient({
endpoint: "https://YOUR-ACCOUNT.documents.azure.com:443/",
aadCredentials: new DefaultAzureCredential(),
});
const { database } = await client.databases.createIfNotExists({ id: "[db]" });
const { container } = await database.containers.createIfNotExists({
id: "[container]",
partitionKey: "/tenantId",
});
```
Traps:
- **aadCredentials, not credential.** The option name in @azure/cosmos is `aadCredentials`. Passing `credential` silently does nothing and you get auth errors.
- **Data-plane role.** "Cosmos DB Built-in Data Contributor" via `az cosmosdb sql role assignment create`. Same 403-without-it story.
- **createIfNotExists is your friend.** Databases and containers: create-if-not-exists in setup code avoids 404/409 races in fresh environments.
- **Partition key on every write.** Point operations need both id and partition key value. Forgetting the partition key value on `container.item(id, pk).read()` is the classic 404-that-is-not-a-404.
Verify: write one item, point-read it back, then run a query and log the request charge.Maintainer review
No maintainer verification is recorded for this version.
This records the version a maintainer checked. It does not assert that the version is the latest upstream release.
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