How can I tell how many objects I’ve stored in an S3 bucket?

by

Using AWS CLI

aws s3 ls s3://mybucket/ --recursive | wc -l

or 

aws cloudwatch get-metric-statistics \
  --namespace AWS/S3 --metric-name NumberOfObjects \
  --dimensions Name=BucketName,Value=BUCKETNAME \
              Name=StorageType,Value=AllStorageTypes \
  --start-time 2016-11-05T00:00 --end-time 2016-11-05T00:10 \
  --period 60 --statistic Average

Note: The above cloudwatch command seems to work for some while not for others. Discussed here: https://forums.aws.amazon.com/thread.jspa?threadID=217050

Using AWS Web Console

You can look at cloudwatch’s metric section to get approx number of objects stored.
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I have approx 50 Million products and it took more than an hour to count using aws s3 ls

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