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

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Unless I'm missing something, it seems that none of the APIs I've looked at will tell you how many objects are in an S3 bucket / folder(prefix). Is there any way to get a count?

There is no way, unless you

  1. list them all in batches of 1000 (which can be slow and suck bandwidth - amazon seems to never compress the XML responses), or

  2. log into your account on S3, and go Account - Usage. It seems the billing dept knows exactly how many objects you have stored!

Simply downloading the list of all your objects will actually take some time and cost some money if you have 50 million objects stored.

Also see this thread about StorageObjectCount - which is in the usage data.

An S3 API to get at least the basics, even if it was hours old, would be great.

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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.

I have approx 50 Million products and it took more than an hour to count using aws s3 ls

Count objects 1 (practice) | Counting, Practice counting up to 20 objects. Objects are organized neatly into rows and columns. One way to do it is once you have selected your objects, hit Invert - twice, then look at the command line. Just beware that if you have many thousands of objects that it may take a bit of time. Looking in Properties will not be very useful if you have more than one object type.

There is a --summarize switch which includes bucket summary information (i.e. number of objects, total size).

Here's the correct answer using AWS cli:

aws s3 ls s3://bucketName/path/ --recursive --summarize | grep "Total Objects:"

Total Objects: 194273

See the documentation

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Although this is an old question, and feedback was provided in 2015, right now it's much simpler, as S3 Web Console has enabled a "Get Size" option:

Which provides the following:

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If you use the s3cmd command-line tool, you can get a recursive listing of a particular bucket, outputting it to a text file.

s3cmd ls -r s3://logs.mybucket/subfolder/ > listing.txt

Then in linux you can run a wc -l on the file to count the lines (1 line per object).

wc -l listing.txt

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Comments
  • This question might be helpful: stackoverflow.com/questions/701545/…
  • Solution does exist now in 2015: stackoverflow.com/a/32908591/578989
  • See my answer below: stackoverflow.com/a/39111698/996926
  • 2017 Answer: stackoverflow.com/a/42927268/4875295
  • That link is dead, by the way.
  • Sorry: developer.amazonwebservices.com/connect/…
  • If you're lazy like me, Newvem basically does this on your behalf and aggregates/tracks the results on a per-bucket level across your S3 account.
  • Could you update your response to include @MayankJaiswal's response?
  • the billing dept knows all! no wonder they have the power to take down s3 east coast by accident
  • This should be closer to the top.
  • @JosephMCasey I agree. This also works to give the number of objects in a directory with a bucket like this: aws s3 ls s3://mybucket/mydirectory/ --recursive | wc -l
  • Gives this error when I ran the above in cmd prompt - 'wc' is not recognized as an internal or external command, operable program or batch file. - I'm pretty new to this so can someone give a solution?