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86 lines
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86 lines
5.1 KiB
Plaintext
---
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title: How to capture impression data
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---
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import ApiRequest from '@site/src/components/ApiRequest'
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:::info Placeholders
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Placeholders in code samples below are delimited by angle brackets (i.e. `<placeholder-name>`). You will need to replace them with the values that are correct in _your_ situation for the code samples to run properly.
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:::
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Unleash allows you to gather [**impression data**](../advanced/impression-data.md) from your feature toggles, giving you complete visibility into who checked what toggles and when. What you do with this data is entirely up to you, but a common use case is to send it off to an aggregation and analytics service such as [Posthog](https://posthog.com/) or [Google Analytics](https://analytics.google.com/), either just for monitoring purposes or to facilitate [A/B testing](../topics/a-b-testing.md).
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This guide will take you through everything you need to do in Unleash to facilitate such a workflow. It will show you how to send data to Posthog as an example sink, but the exact same principles will apply to any other service of the same kind.
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## Prerequisites
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We will assume that you have the necessary details for your third-party service:
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- **where to send the data to**. We'll refer to this in the code samples below as **`<sink-url>`**.
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- **what format the data needs to be in**. This will determine how you transform the event data before you send it.
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In addition, you'll need to have a toggle to record impression data for and an [Unleash client SDK](../sdks/index.md) that supports impression data. This guide will use the [JavaScript proxy SDK](../sdks/proxy-javascript.md).
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When you have those things sorted, follow the below steps.
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## Step 1: Enable impression data for your feature toggle {#step-1}
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Because impression data is an **opt-in feature**, the first step is to enable it for the feature you want to gather data from. You can use both the UI and the API.
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### Enabling impression data for new feature toggles {#step-1-new-toggles}
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When you create a new feature toggle via the UI, there's an option at the end of the form that you must enable:
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To create a feature toggle with impression data enabled, set the `impressionData` option to `true` in the request payload, as seen below. For more options, check the [reference docs on creating features](../api/admin/feature-toggles-api-v2.md#create-toggle).
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<ApiRequest verb="post" payload={{name: "<feature-toggle-name>", impressionData: true}} url="api/admin/projects/<project-id>/features" title="Create a feature toggle with impression data enabled."/>
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### Enabling impression data for existing feature toggles {#step-1-existing-toggles}
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To enable impression data for an existing toggle, use the "edit" button on the toggle's page in the admin UI. It will take you to a form that looks like the toggle creation form. Use the "impression data" toggle to enable impression data the same way you would when [enabling impression data for a new feature toggle](#step-1-new-toggles).
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To enable impression data for an existing toggle, use the [API's toggle patching functionality](../api/admin/feature-toggles-api-v2.md#patch-toggle):
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<ApiRequest verb="patch" payload={[{op: "replace", path: "/impressionData", value: true}]} url="api/admin/projects/<project-id>/features/<feature-toggle-name>" title="Enable impression data on an existing toggle."/>
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## Step 2: Capture impression events in your client {#step-2}
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In your client SDK, initialize the library for the third party service you're using.
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For the full details on setting up a Posthog client, see [the official Posthog JavaScript client docs](https://posthog.com/docs/integrate/client/js).
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The steps below will use extracts from said documentation.
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After initializing the library, you'll probably also want to identify the current user, so that events can be correlated properly:
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``` js title="Identify the user."
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posthog.identify(userId);
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```
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### Capture and transform the event
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Attach an event listener to Unleash that listens for `"impression"` events. Inside the listener, transform the event data to the format you want and send it to your analytics service.
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``` js title="Capture, transform, and send impression data."
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// listen for impression events
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unleash.on("impression", (event) => {
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// capture and transform events
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posthog.capture(event.eventType, {
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...event.context,
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distinct_id: event.context?.userId,
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featureName: event.featureName,
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enabled: event.enabled,
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variant: event.variant,
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});
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});
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```
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Posthog expects an object with a `distinct_id` property that it uses to correlate data.
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Additionally, you can add whatever properties you want, such as the feature toggle name, its state and/or variant, or the whole Unleash context.
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The `posthog.capture` method sends the event data to your Posthog instance.
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