gistfile1.txt

// First, get the item
DynamoDB.get({
  TableName: "http-crud-tutorial-items",
  Key: {
    id: "1",
  },
}).promise().then((data) => {
  const item = data.Item;

  // Update the item
  DynamoDB.put({
    TableName: "http-crud-tutorial-items",
    Item: {
      ...item,
      assets: {
        ...(item.assets || {}),
        token: {
          quantity: "3",
        },
      },
    },
  }).promise().then(() => {
    console.log('Updated item')
  })
})