how to generate a short id to use as key on dynamodb?

I need to create IDs to use as key on DynamoDB. Checked https://github.com/uuidjs/uuid but the ids generated are too long to be remembered. how can I generate shorter ones like the ones from youtube video Id. also do I really need to specify a Key or Dynamo can create one automatically for me just like firebase firestore for example?

this is the code that I'm using.

  var db = new AWS.DynamoDB.DocumentClient();
  var student = {
    TableName: "students",
    Item: {
      id: "abc123",
      name: "Mia",
    },
  };

  db.put(student)
    .promise()
    .then((response) => console.log(response))
    .catch((err) => console.log(err));

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