How to integrate Datadog with OpenReplay and see backend errors alongside session recordings.

1. Generate Datadog API Key & Application Key

Section titled 1. Generate Datadog API Key & Application Key

Go to Datadog > Integrations > APIs and generate the API Key, or use the existing one.

Datadog API Key

On the same page, click on Application Keys and generate a new application key.

Datadog Application Key

2. Enable Integration in OpenReplay

Section titled 2. Enable Integration in OpenReplay

Paste your API Key and Application Key in Datadog in OpenReplay dashboard under ‘Preferences > Integration’.

Datadog Integration in OpenReplay

3. Propagate openReplaySessionToken

Section titled 3. Propagate openReplaySessionToken

To link a Datadog 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()) { // or 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 Datadog log entry with the recorded user session, a unique token has to be propagated to 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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