Amazon S3

Amazon S3 — the Simple Storage Service — is a common place to dump data for long-term storage on AWS. Pipedream supports delivery to S3 as a first-class Destination.

Adding an S3 Destination

Adding an S3 Action

First, add a new Action, then select the Amazon S3 Action. S3 Actions require you to specify the Bucket where you want to send data, the Payload you want to send, and an optional Prefix. Before sending data, you must allow Pipedream to upload objects to your bucket — see the S3 Bucket Policy below.

Using $send.s3()

You can send data to an S3 Destination in Node.js code steps, too, using the $send.s3() function. This allows you to send data to S3 programmatically, if you need more control than Actions afford.

$send.s3() takes the same parameters as the corresponding Action:

  bucket: "your-bucket-here",
  prefix: "your-prefix/",
  payload: event.body

Like with any $send function, you can use $send.s3() conditionally, within a loop, or anywhere you'd use a function normally in Node.js.

S3 Bucket Policy

In order for us to deliver objects to your S3 bucket, you need to modify the bucket policy for your target bucket to allow Pipedream to upload objects.

Replace [your bucket name] with the name of your bucket near the bottom of the policy.

  "Version": "2012-10-17",
  "Id": "allow-pipedream-limited-access",
  "Statement": [
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::203863770927:role/Pipedream"
      "Action": [
      "Resource": [
        "arn:aws:s3:::[your bucket name]",
        "arn:aws:s3:::[your bucket name]/*"

This bucket policy provides the minimum set of permissions necessary for Pipedream to deliver objects to your S3 bucket. We use the Multipart Upload API to upload objects to S3, and need the relevant permissions.

S3 Destination delivery

S3 Destination delivery is handled asynchronously, separate from the execution of a workflow. Moreover, events sent to an S3 bucket are batched and delivered once a minute. For example, if you sent 30 events to an S3 Destination within a particular minute, we would collect all 30 events, delimit them with newlines, and write them to a single S3 object.

In some cases, delivery will take longer than a minute. You can always review how many Destinations we've delivered a given event to by examining the Dest column in the Inspector.

S3 object format

We upload objects to S3 using the following format:


That is — we write objects first to your prefix, then within folders specific to the current date and hour, then upload the object with the same date information in the object, so that it's easy to tell when it was uploaded by object name alone.

For example, if I were writing data to a prefix of test/, I might see an object in S3 at this path:


As noted above, a given object contains all payloads delivered to an S3 Destination within a specific minute. Multiple events within a given object are newline-delimited.

Still have questions?

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