dynamodb.put().promise() not returning the put object

According to the doc you have to use ReturnValues if you want something back.

I have tried ReturnValues: 'ALL_OLD' but in async await it has no result.

Here is a part of code:

const answersParams = {
          TableName: ANSWERS_TABLE,
          Item: {
            answersId,
            answers,
            userId,
            quizId,
          },
          ReturnValues: 'ALL_OLD',
        };

        try {
          const createdAnswres = await db.put(answersParams).promise();

          return {
            statusCode: 201,
            body: JSON.stringify(createdAnswres && createdAnswres.Item),
          };
        } catch (error) {
          return {
            statusCode: 500,
            body: 'failed to save user answers',
          };
        }
      }
    

So I had to add another request to db:

const createdAnswres = await db.get({
              TableName: ANSWERS_TABLE,
              Key: { answersId },
            })
            .promise();
    

When you're using promises, you should handle the returned promise object using .then() and .catch(). If you take a look at the documentation, your request should look like this:

dynamoDb.put(params).promise()
  .then(function(data) {
    console.log(data);
  })
  .catch(function(err) {
    console.log(err);
  });

This will also help you see if you are getting any error (same idea as surrounding an await with try/catch, but clearer syntax)