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Connect to DynamoDB

Amazon DynamoDB is a fully managed NoSQL database. To persist data to DynamoDB, follow the steps below:

The tutorial assumes that you have an AWS and Deno Deploy account.

You can find a more comprehensive tutorial that builds a sample application on top of DynamoDB here.

Gather credentials from DynamoDB Jump to heading

The first step in the process is to generate AWS credentials to programmatically access DynamoDB.

Generate Credentials:

  1. Go to https://console.aws.amazon.com/iam/ and go to the "Users" section.
  2. Click on the Add user button, fill the User name field (maybe use denamo), and select Programmatic access type.
  3. Click on Next: Permissions, then on Attach existing policies directly, search for AmazonDynamoDBFullAccess and select it.
  4. Click on Next: Tags, then on Next: Review and finally Create user.
  5. Click on Download .csv button to download the credentials.

Create a project in Deno Deploy Jump to heading

Next, let's create a project in Deno Deploy and set it up with the requisite environment variables:

  1. Go to https://dash.deno.com/new (Sign in with GitHub if you didn't already) and click on + Empty Project under Deploy from the command line.
  2. Now click on the Settings button available on the project page.
  3. Navigate to Environment Variables Section and add the following secrets.
  • AWS_ACCESS_KEY_ID - Use the value that's available under Access key ID column in the downloaded CSV.
  • AWS_SECRET_ACCESS_KEY - Use the value that's available under Secret access key column in the downloaded CSV.

Write code that connects to DynamoDB Jump to heading

AWS has an official SDK that works with browsers. As most Deno Deploy's APIs are similar to browsers', the same SDK works with Deno Deploy. To use the SDK in Deno, import from a cdn like below and create a client:

import {
  DynamoDBClient,
  GetItemCommand,
  PutItemCommand,
} from "https://esm.sh/@aws-sdk/client-dynamodb?dts";

// Create a client instance by providing your region information.
// The credentials are automatically obtained from environment variables which
// we set during our project creation step on Deno Deploy, so we don't have to
// pass them manually here.
const client = new ApiFactory().makeNew(DynamoDB);

serve({
  "/songs": handleRequest,
});

async function handleRequest(request) {
  // async/await.
  try {
    const data = await client.send(command);
    // process data.
  } catch (error) {
    // error handling.
  } finally {
    // finally.
  }
}

Deploy application to Deno Deploy Jump to heading

Once you have finished writing your application, you can deploy it on Deno Deploy.

To do this, go back to your project page at https://dash.deno.com/projects/<project-name>.

You should see a couple of options to deploy:

  • Github integration
  • deployctl
    deployctl deploy --project=<project-name> <application-file-name>

Unless you want to add a build step, we recommend that you select the Github integration.

For more details on the different ways to deploy on Deno Deploy and the different configuration options, read here.