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Feed with Azure Cosmos DB for NoSQL (TypeScript) + +This sample demonstrates how to read the **change feed** of an Azure Cosmos DB for NoSQL container using the Azure SDK for JavaScript/TypeScript. It upserts a set of items and then reads all changes from the beginning of the container's history using the change feed iterator. + +## Prerequisites + +- An [Azure subscription](https://azure.microsoft.com/free/) +- An Azure Cosmos DB for NoSQL account +- [Node.js 20+](https://nodejs.org/) + +## Run + +> [!IMPORTANT] +> These environment variables are set **only for the current terminal session** and do **not persist** after you close the window. + +### macOS / Linux + +```bash +export COSMOS_ENDPOINT="https://.documents.azure.com:443/" +export COSMOS_KEY="" +npm install +npm start +``` + +### Windows (PowerShell) + +```powershell +$Env:COSMOS_ENDPOINT="https://.documents.azure.com:443/" +$Env:COSMOS_KEY="" +npm install +npm start +``` + +You can find your endpoint and primary key in the Azure portal under your Cosmos DB account → **Keys**. + +## What this sample does + +1. Connects to Azure Cosmos DB using key-based authentication +2. Creates (or retrieves) the `cosmicworks` database +3. Creates (or retrieves) the `products` container partitioned by `/category` +4. Upserts two `Product` items to generate change feed events +5. Reads all changes from the **beginning** of the container's history using `getChangeFeedIterator` +6. Prints each changed item until the feed is caught up (`304 Not Modified`) diff --git a/javascript/201-change-feed/src/index.ts b/javascript/201-change-feed/src/index.ts new file mode 100644 index 0000000..fa4547c --- /dev/null +++ b/javascript/201-change-feed/src/index.ts @@ -0,0 +1,77 @@ +import { CosmosClient, ChangeFeedStartFrom } from "@azure/cosmos"; + +interface Product { + id: string; + category: string; + name: string; + quantity: number; + sale: boolean; +} + +const endpoint = process.env.COSMOS_ENDPOINT; +if (!endpoint) { + throw new Error("COSMOS_ENDPOINT environment variable is not set."); +} + +const key = process.env.COSMOS_KEY; +if (!key) { + throw new Error("COSMOS_KEY environment variable is not set."); +} + +const client = new CosmosClient({ endpoint, key }); + +// Create or retrieve database +const { database } = await client.databases.createIfNotExists({ id: "cosmicworks" }); +console.log(`Database:\t${database.id}`); + +// Create or retrieve container +const { container } = await database.containers.createIfNotExists({ + id: "products", + partitionKey: { paths: ["/category"] }, +}); +console.log(`Container:\t${container.id}`); + +// Upsert items to generate change feed events +const products: Product[] = [ + { + id: "70b63682-b93a-4c77-aad2-65501347265f", + category: "gear-surf-surfboards", + name: "Yamba Surfboard", + quantity: 12, + sale: false, + }, + { + id: "25a68543-b90c-439d-8332-7ef41e06a0e0", + category: "gear-surf-surfboards", + name: "Kiama Classic Surfboard", + quantity: 25, + sale: true, + }, +]; + +for (const product of products) { + await container.items.upsert(product); + console.log(`Upserted item:\t${product.id}`); +} + +// Read the change feed starting from now to avoid replaying the full history on reruns +console.log("\nReading change feed..."); + +const iterator = container.items.getChangeFeedIterator({ + changeFeedStartFrom: ChangeFeedStartFrom.Now(), +}); + +while (iterator.hasMoreResults) { + const { result, statusCode } = await iterator.readNext(); + + // 304 Not Modified means the feed is caught up — no new changes + if (statusCode === 304) { + break; + } + + for (const item of result) { + console.log(`Changed item:\t${item.id} | ${item.name} | Qty: ${item.quantity}`); + } +} + +console.log("\nChange feed complete.");