---
title: Send Optimizely Data Platform data with Real-Time  Audiences for Feature Experimentation for the JavaScript (Node) SDK prior to v6
slug: feature-experimentation/docs/send-odp-data-with-real-time-audiences-for-feature-experimentation-javascript-node-prior-to-v6
docTags: 
createdAt: 2026-08-05T20:39:53.000Z
---

## Prerequisites

You must configure [Real-Time Audiences for Feature Experimentation](docId:6UBBxxRv331nBIVZ2lun8) before sending events to ODP from Feature Experimentation.

## JavaScript (Node) SDK Version

5.0.0

## Description

The Optimizely Client extension method `sendOdpEvent` lets you send data to the ODP server. You can then use this data to analyze user behavior and optimize experiences across different channels and touchpoints.

Use the `sendOdpEvent` method to

- [Merge or stitch users together](docId\:zofYSXRfkDa-2L5Umjfmy) and determine which event is associated with which customer.
- Send various types of events and actions, such as pageviews, clicks, form submissions, and others. You can include additional data to provide more context and information about the event being tracked.

For example, by connecting an email address identifier with a `fs_user_id` identifier, you can use the `sendOdpEvent` method to send events that are associated with both identifiers. This enables you to track and analyze the behavior of a specific user across different touchpoints and devices.

You cannot create or update user profile data like name or address with `sendOdpEvent`. Instead, you can use the [ODP Create and update customers API endpoint](docId:8V9hWw_Py3-kwJJ5H7uR0)or [ODP UI](docId:9GxAiVHBPBQndq-66qYBy) to manage customer profiles.

## Send events to Optimizely Data Platform

The JavaScript (Node) SDK discards the event immediately if there are any errors(`sdkNotReady`, `odpNotIntegrated`, or `odpNotEnabled`).

## Parameters

This table lists the required and optional parameters for the `sendOdpEvent` method.

| Parameter               | Type   | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| ----------------------- | ------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| \`action\` \_required\_ | String | Specifies the subcategory of the event type, which is used to track the app and user lifecycle.                                                                                                                                                                                                                                                                                                                                                                                                        |
| \`type\`                | String | The type of event to be sent. Is \`fullstack\` for all JavaScript (Node) SDK-generated events if not specified.                                                                                                                                                                                                                                                                                                                                                                                        |
| \`identifiers\`         | Map\\  | A key-value map of user identifiers. At least one key-value pair is required.                                                                                                                                                                                                                                                                                                                                                                                                                          |
| \`data\`                | Map\\  | The event data in a key-value map. The value can be any type (string, number, or boolean.) Null values are allowed but will be interpreted as empty strings. The JavaScript (Node) SDK adds default event data to the given data dictionary. The default data values can be overwritten by sending the same key when creating your dictionary.<br />- "idempotence\\\_id":\\<br />- "data\\\_source\\\_type":"sdk"<br />- "data\\\_source":"javascript-node-sdk"<br />- "data\\\_source\\\_version":\\ |

## Returns

This method sends event data to ODP. It does not provide return values.

## Example

Method signature for `sendOdpEvent`:

`sendOdpEvent(action: string, type?: string, identifiers?: Map<string, string>, data?: Map<string, unknown>): void;`

```javascript
const identifiers = new Map([["fs_user_id", "user123"], ["email", "user123@optimizely.com"]]);
const data = new Map([["count", 1]]);

try {
  optimizelyInstance.sendOdpEvent("purchased","fullstack", identifiers, data);
} catch (error) {
  // handle error here
}
```

The following diagram shows network calls between your application, the JavaScript (Node) SDK, and the ODP server when calling the `sendOdpEvent` method:

![](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/NoTNnx-QBeGiIp1REUlCk_81f5657-javascript-node-sendodpevent.png)

1. Your application calls the `sendOdpEvent` method.
2. The JavaScript (Node) SDK makes a POST request to ODP.
3. ODP responds with acknowledgement or relevant error.

## Source files

The language and platform source files containing the implementation for the JavaScript (Node) SDK are available on [GitHub](https://github.com/optimizely/javascript-sdk/blob/master/lib/optimizely/index.ts).