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Conversion tracking requires a Business plan subscription or higher.
When it comes to conversion tracking, a lead event happens when a user performs an action that indicates interest in your product or service. This could be anything from:
  • Signing up for an account
  • Booking a demo meeting
  • Joining a mailing list
A diagram showing how lead events are tracked in the conversion funnel
In this guide, we will be focusing on tracking new user sign-ups for a SaaS application that uses NextAuth.js for user authentication.

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Prerequisites

First, you’ll need to enable conversion tracking for your Dub links to be able to start tracking conversions:
If you’re using Dub Partners, you can skip this step since partner links will have conversion tracking enabled by default.
To enable conversion tracking for all future links in a workspace, you can do the following: To enable conversion tracking for all future links in a workspace, you can do the following:
  1. Navigate to your workspace’s Analytics settings page.
  2. Toggle the Workspace-level Conversion Tracking switch to enable conversion tracking for the workspace.
Enabling conversion tracking for a workspace
This option will enable conversion tracking in the Dub Link Builder for all future links.
Alternatively, you can also enable conversion tracking programmatically via the Dub API. All you need to do is pass trackConversion: true when creating or updating a link:
const link = await dub.links.create({
  url: "https://dub.co",
  trackConversion: true,
});
Then, you’d want to install the @dub/analytics script to your website to track conversion events. You can install the @dub/analytics script in several different ways:

React

Manual installation

Framer

Shopify

WordPress

Webflow

Google Tag Manager

You can verify the installation with the following tests:
  1. Open the browser console and type in _dubAnalytics – if the script is installed correctly, you should see the _dubAnalytics object in the console.
  2. Add the ?dub_id=test query parameter to your website URL and make sure that the dub_id cookie is being set in your browser.
If both of these checks pass, the script is installed correctly. Otherwise, please make sure:
  • The analytics script was added to the <head> section of the page
  • If you’re using a content delivery network (CDN), make sure to purge any cached content

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Configure NextAuth.js Options

Then, set up your NextAuth.js configuration options to track lead conversion events using the dub TypeScript SDK. Here’s how it works in a nutshell:
  1. Use NextAuth’s signIn event to detect when there’s a new sign up.
  2. If the user is a new sign up, check if the dub_id cookie is present.
  3. If the dub_id cookie is present, send a lead event to Dub using dub.track.lead
  4. Delete the dub_id cookie.
Under the hood, Dub records the user as a customer and associates them with the click event that they came from. The user’s unique ID is now the source of truth for all future events – hence why we don’t need the dub_id cookie anymore. 
// app/api/auth/[...nextauth]/options.ts
import type { NextAuthOptions } from "next-auth";
import { cookies } from "next/headers";
import { dub } from "@/lib/dub";

export const authOptions: NextAuthOptions = {
  ...otherAuthOptions, // your other NextAuth options
  events: {
    async signIn(message) {
      // if it's a new sign up
      if (message.isNewUser) {
        const cookieStore = await cookies();
        // check if dub_id cookie is present
        const dub_id = cookieStore.get("dub_id")?.value;
        if (dub_id) {
          // send lead event to Dub
          await dub.track.lead({
            clickId: dub_id,
            eventName: "Sign Up",
            customerExternalId: user.id,
            customerName: user.name,
            customerEmail: user.email,
            customerAvatar: user.image,
          });
          // delete the cookies
          cookieStore.delete("dub_id");
          cookieStore.delete("dub_partner_data");
        }
      }
    },
  },
};
In NextAuth.js, the isNewUser flag will only be available if you’re using next-auth’s database implementation (otherwise it’ll return undefined). In that case, you should move the logic above to the signIn callback instead.
Here’s the full list of attributes you can pass when sending a lead event:
PropertyRequiredDescription
clickIdYesThe unique ID of the click that the lead conversion event is attributed to. You can read this value from dub_id cookie. If an empty string is provided (i.e. if you’re using tracking a deferred lead event), Dub will try to find an existing customer with the provided customerExternalId and use the clickId from the customer if found.
eventNameYesThe name of the lead event to track. Can also be used as a unique identifier to associate a given lead event for a customer for a subsequent sale event (via the leadEventName prop in /track/sale).
customerExternalIdYesThe unique ID of the customer in your system. Will be used to identify and attribute all future events to this customer.
customerNameNoThe name of the customer. If not passed, a random name will be generated (e.g. “Big Red Caribou”).
customerEmailNoThe email address of the customer.
customerAvatarNoThe avatar URL of the customer.
modeNoThe mode to use for tracking the lead event. async will not block the request; wait will block the request until the lead event is fully recorded in Dub; deferred will defer the lead event creation to a subsequent request.
metadataNoAdditional metadata to be stored with the lead event. Max 10,000 characters.

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Create a NextAuth.js Route Handler

Finally, import the authOptions variable you created earlier and use NextAuth to create a handler for your NextAuth.js routes. 
// app/api/auth/[...nextauth]/index.ts
import { authOptions } from "./options";
import NextAuth from "next-auth";

const handler = NextAuth(authOptions);

export { handler as GET, handler as POST };

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View your conversions

Once you’ve completed the setup, all your tracked conversions will show up in Dub Analytics. We provide 3 different views to help you understand your conversions:
Time-series line chart
  • Funnel chart: A funnel chart view visualizing the conversion & dropoff rates across the different steps in the conversion funnel (clicks → leads → sales).
Funnel chart view showing the conversion & dropoff rates from clicks → leads → sales
  • Real-time events stream: A real-time events stream of every single conversion event that occurs across all your links in your workspace.
The Events Stream dashboard on Dub
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