If you’re using the “Prefer Advertising ID for Device ID” setting with one of our bundled mobile SDKs, the following rules apply. This option is not currently available for mobile libraries using cloud-mode. If you’re using the “Prefer Anonymous ID for Device ID” setting in client-side, server-side, or a mobile library with Cloud-mode enabled, the following rules apply. The table below represents default behavior. You can set the Device ID in slightly different ways depending on the library and connection mode you’re using (Device-mode vs Cloud-mode).

If you’re using Analytics.js in device-mode, or a bundled SDK, Segment automatically includes anonymousId for you.

If you’re using a Segment server library or the Segment HTTP API, you must explicitly include both anonymousId and userId.

If you don’t include the anonymousId, Amplitude can’t tell that the anonymous user is the same person as the logged-in user. To have Amplitude recognize an anonymous user and a known or logged-in user, make sure you include both the user’s userId and the anonymousId they had before that in your Identify call. Merging users with Anonymous ID and User ID Sets any traits you provide as Amplitude custom user_properties. When you make an Identify call, Segment uses the userId you provide to set the User Id in Amplitude, and you can't make them from A.js client-side. Note: screen calls are only for mobile.

Add an import statement to your project, as in the example below.

Navigate to the root folder of your project, and run a yarn add command to add the destination SDK to your project.

To add the Amplitude device-mode SDK to a React Native project using Segment’s 1.5.1≤ release: If you included Segment’s JavaScript snippet on your page, then Amplitude’s SDK loads on your page automatically and you can use Segment’s to begin sending events right away. Locate the project you want to receive your Segment data, copy that project’s API key, and paste it into your Amplitude destination settings in Segment. It is a 32-character string of numbers and letters.

You can find your Amplitude API key in the Amplitude project settings. In the destination settings, enter your Amplitude API key.

Choose which sources to connect the destination to.

From the Segment web app, navigate to Connections > Destinations and click Add Destination.

There’s also a page about the Amplitude Engage Segment source, which sends data to Segment! Getting Started Good to know: This page is about the Amplitude Segment destination, which receives data from Segment.

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