How to integrate CloudWatch with OpenReplay and see backend errors alongside session replays.

  1. Login to your AWS account.
  2. Go to IAM dashboard.
  3. Click on Users.
  4. Click on Add user button.
  5. Set the name to “openreplay_cw”.
  6. In access type, select Programmatic access.
  7. Click on Next: Permissions button.
  8. Choose Attach existing policies directly
  9. In the list of permissions, choose CloudWatchReadOnlyAccess.
  10. Click Next: Tags button.
  11. Click Next: Review button.
  12. Click Create user button.
  13. Copy the Access key ID and the Secret access key.

2. Enable CloudWatch in OpenReplay

Section titled 2. Enable CloudWatch in OpenReplay

Put your Access key ID and Secret access key in OpenReplay dashboard under ‘Preferences > Integration’, select the region and select the log group that you want to track from the dropdown list.

CloudWatch Integration in OpenReplay

3. Propagate openReplaySessionToken

Section titled 3. Propagate openReplaySessionToken

To link a CloudWatch event with the recorded user session, a unique token has to be propagated from your frontend to your backend on each request you want to track. This can be done using a custom HTTP header. In the below example, we use the fetch function to send that header.

const headers = {
  Accept: 'application/json',
  'Content-Type': 'application/json',
if (tracker.getSessionToken()) { // use window.OpenReplay instead of tracker if you're using the snippet
  headers['X-OpenReplay-SessionToken'] = tracker.getSessionToken(); // Inject openReplaySessionToken
fetch('', {

In order for OpenReplay to associate a Cloudwatch log entry with the recorded user session, a unique token has to be propagated as part of each backend error you wish to track.

Below is an example in Python using Monkey Patching.

import sys
import traceback
old_tb = traceback.print_exception
old_f = sys.stdout
old_e = sys.stderr

class F:
    def write(self, x):
        if OPENREPLAY_SESSION_TOKEN is not None and x != '\n':
            old_f.write(f"[openReplaySessionToken={OPENREPLAY_SESSION_TOKEN}] {x}")

    def flush(self):

def tb_print_exception(etype, value, tb, limit=None, file=None, chain=True):
        value = type(value)(f"[openReplaySessionToken={OPENREPLAY_SESSION_TOKEN}] " + str(value))
    old_tb(etype, value, tb, limit, file, chain)

traceback.print_exception = tb_print_exception

sys.stderr = F()

The name of the tag openReplaySessionToken is case sensitive.

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