Add an API to List All the Notes

Now we are going to add an API that returns a list of all the notes a user has. This’ll be very similar to the previous chapter where we were returning a single note.

Add the Function

Create a new file in packages/functions/src/list.ts with the following.

import { Resource } from "sst";
import { Util } from "@notes/core/util";
import { DynamoDBClient } from "@aws-sdk/client-dynamodb";
import { QueryCommand, DynamoDBDocumentClient } from "@aws-sdk/lib-dynamodb";

const dynamoDb = DynamoDBDocumentClient.from(new DynamoDBClient({}));

export const main = Util.handler(async (event) => {
  const params = {
    TableName: Resource.Notes.name,
    // 'KeyConditionExpression' defines the condition for the query
    // - 'userId = :userId': only return items with matching 'userId'
    //   partition key
    KeyConditionExpression: "userId = :userId",
    // 'ExpressionAttributeValues' defines the value in the condition
    // - ':userId': defines 'userId' to be the id of the author
    ExpressionAttributeValues: {
      ":userId": "123",
    },
  };

  const result = await dynamoDb.send(new QueryCommand(params));

  // Return the matching list of items in response body
  return JSON.stringify(result.Items);
});

This is pretty much the same as our get.ts except we use a condition to only return the items that have the same userId as the one we are passing in. In our case, it’s still hardcoded to 123.

Add the Route

Let’s add the route for this new endpoint.

Add the following above the POST /notes route in infra/api.ts.

api.route("GET /notes", "packages/functions/src/list.main");

Deploy Our Changes

If you switch over to your terminal, you will notice that your changes are being deployed.

You should see that the new API has been deployed.

+  Complete
   Api: https://5bv7x0iuga.execute-api.us-east-1.amazonaws.com

Test the API

Let’s test list all notes API.

Run the following in your terminal.

$ curl https://5bv7x0iuga.execute-api.us-east-1.amazonaws.com/notes

Again, replacing the example URL with your Api value.

Since we are making a simple GET request, we could also go to this URL directly in your browser.

The response should look something like this.

[{"attachment":"hello.jpg","content":"Hello World","createdAt":1629336889054,"noteId":"a46b7fe0-008d-11ec-a6d5-a1d39a077784","userId":"123"}]

Note that, we are getting an array of notes. Instead of a single note.

Next we are going to add an API to update a note.