How to track lead conversion events with Supabase and Dub

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 Supabase for user authentication.

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.

Option 1: On a workspace-level

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:

Navigate to your workspace’s Analytics settings page.
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.

Option 2: On a link-level

If you don’t want to enable conversion tracking for all your links in a workspace, you can also opt to enable it on a link-level.To enable conversion tracking for a specific link, open the Dub Link Builder for a link and toggle the Conversion Tracking switch.

You can also use the C keyboard shortcut when inside the link builder to quickly enable conversion tracking for a given link.

Option 3: Via the API

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,
});

link = d.links.create(url="https://dub.co", track_conversion=True)

link, err := d.Links.Create(ctx, &dub.CreateLinkRequest{
    URL: "https://dub.co",
    TrackConversion: true,
})

s.links.create_many(
  ::OpenApiSDK::Operations::CreateLinkRequest.new(
    url: "https://dub.co",
    track_conversion: 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:

Open the browser console and type in _dubAnalytics – if the script is installed correctly, you should see the _dubAnalytics object in the console.
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

Configure Supabase

Next, configure Supabase to track lead conversion events. The implementation depends on your authentication flow:

Auth callback implementation

For OAuth providers (Google, GitHub, etc.) and email signup with verification enabled, implement the /auth/callback route:

In the /api/auth/callback route, check if:
- the dub_id cookie is present.
- the user is a new sign up (created in the last 10 minutes).
If the dub_id cookie is present and the user is a new sign up, send a lead event to Dub using dub.track.lead
Delete the dub_id cookie.

// app/api/auth/callback/route.ts
import { cookies } from "next/headers";
import { NextResponse } from "next/server";
import { createClient } from "@/lib/supabase/server";
import { waitUntil } from "@vercel/functions";
import { dub } from "@/lib/dub";

export async function GET(request: Request) {
  const { searchParams, origin } = new URL(request.url);
  const code = searchParams.get("code");
  // if "next" is in param, use it as the redirect URL
  const next = searchParams.get("next") ?? "/";

  if (code) {
    const supabase = createClient(cookies());
    const { data, error } = await supabase.auth.exchangeCodeForSession(code);
    if (!error) {
      const { user } = data;
      const dub_id = cookies().get("dub_id")?.value;
      // if the user is created in the last 10 minutes, consider them new
      const isNewUser =
        new Date(user.created_at) > new Date(Date.now() - 10 * 60 * 1000);
      // if the user is new and has a dub_id cookie, track the lead
      if (dub_id && isNewUser) {
        waitUntil(
          dub.track.lead({
            clickId: dub_id,
            eventName: "Sign Up",
            customerExternalId: user.id,
            customerName: user.user_metadata.name,
            customerEmail: user.email,
            customerAvatar: user.user_metadata.avatar_url,
          })
        );
        // delete the clickId cookie
        cookies().delete("dub_id");
      }
      return NextResponse.redirect(`${origin}${next}`);
    }
  }

  // return the user to an error page with instructions
  return NextResponse.redirect(`${origin}/auth/auth-code-error`);
}

// pages/api/auth/callback.ts
import { NextApiRequest, NextApiResponse } from "next";
import { createClient } from "@supabase/supabase-js";
import { dub } from "@/lib/dub";

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  const { code, next = "/" } = req.query;
  const origin = `${req.headers["x-forwarded-proto"]}://${req.headers.host}`;

  if (typeof code === "string") {
    const supabase = createClient(
      process.env.NEXT_PUBLIC_SUPABASE_URL!,
      process.env.SUPABASE_SERVICE_ROLE_KEY!
    );

    const { data, error } = await supabase.auth.exchangeCodeForSession(code);

    if (!error) {
      const { user } = data;
      const { dub_id } = req.cookies;

      // if the user is created in the last 10 minutes, consider them new
      const isNewUser =
        new Date(user.created_at) > new Date(Date.now() - 10 * 60 * 1000);

      // if the user is new and has a dub_id cookie, track the lead
      if (dub_id && isNewUser) {
        dub.track
          .lead({
            clickId: dub_id,
            eventName: "Sign Up",
            customerExternalId: user.id,
            customerName: user.user_metadata.name,
            customerEmail: user.email,
            customerAvatar: user.user_metadata.avatar_url,
          })
          .catch(console.error); // Handle any errors in tracking

        // delete the clickId cookie
        res.setHeader(
          "Set-Cookie",
          `dub_id=; Path=/; Expires=Thu, 01 Jan 1970 00:00:00 GMT`
        );
      }

      return res.redirect(`${origin}${next}`);
    }
  }

  // return the user to an error page with instructions
  return res.redirect(`${origin}/auth/auth-code-error`);
}

The /auth/callback route handles most authentication conditions except normal user signup with email when email verification is disabled. For this flow, you need to add tracking code directly to your signup page.

When email verification is disabled, users are immediately signed in after signup without going through the /auth/callback route. Add the tracking code directly to your signup form handler:

// app/actions/auth.ts
'use server';

import { cookies } from 'next/headers';
import { createClient } from '@/lib/supabase/server';
import { dub } from '@/lib/dub';
import { redirect } from 'next/navigation';

export async function signUp(formData: FormData) {
  const email = formData.get('email') as string;
  const password = formData.get('password') as string;

  const supabase = createClient(cookies());
  const { data, error } = await supabase.auth.signUp({
    email,
    password,
  });

  if (error) {
    throw new Error(error.message);
  }

  // Track the lead conversion if signup was successful
  if (data.user) {
    const dubId = cookies().get('dub_id')?.value;

    if (dubId) {
      await dub.track.lead({
        clickId: dubId,
        eventName: 'Sign Up',
        customerExternalId: data.user.id,
        customerEmail: data.user.email,
        customerName: data.user.user_metadata?.name,
        customerAvatar: data.user.user_metadata?.avatar_url,
      });

      // Delete the dub_id cookie
      cookies().delete('dub_id');
    }
  }

  redirect('/dashboard');
}

// pages/api/auth/signup.ts
import { NextApiRequest, NextApiResponse } from 'next';
import { createClient } from '@supabase/supabase-js';
import { dub } from '@/lib/dub';

export default async function handler(
  req: NextApiRequest,
  res: NextApiResponse
) {
  if (req.method !== 'POST') {
    return res.status(405).json({ error: 'Method not allowed' });
  }

  const { email, password } = req.body;

  const supabase = createClient(
    process.env.NEXT_PUBLIC_SUPABASE_URL!,
    process.env.SUPABASE_SERVICE_ROLE_KEY!
  );

  try {
    const { data, error } = await supabase.auth.signUp({
      email,
      password,
    });

    if (error) throw error;

    // Track the lead conversion if signup was successful
    if (data.user) {
      const { dub_id } = req.cookies;

      if (dub_id) {
        await dub.track.lead({
          clickId: dub_id,
          eventName: 'Sign Up',
          customerExternalId: data.user.id,
          customerEmail: data.user.email,
          customerName: data.user.user_metadata?.name,
          customerAvatar: data.user.user_metadata?.avatar_url,
        });

        // Delete the dub_id cookie
        res.setHeader(
          'Set-Cookie',
          'dub_id=; Path=/; Expires=Thu, 01 Jan 1970 00:00:00 GMT'
        );
      }
    }

    res.status(200).json({ user: data.user });
  } catch (error) {
    res.status(400).json({ error: error.message });
  }
}

Here’s the full list of attributes you can pass when sending a lead event:

Property	Required	Description
`clickId`	Yes	The 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.
`eventName`	Yes	The 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`).
`customerExternalId`	Yes	The unique ID of the customer in your system. Will be used to identify and attribute all future events to this customer.
`customerName`	No	The name of the customer. If not passed, a random name will be generated (e.g. “Big Red Caribou”).
`customerEmail`	No	The email address of the customer.
`customerAvatar`	No	The avatar URL of the customer.
`mode`	No	The 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.
`metadata`	No	Additional metadata to be stored with the lead event. Max 10,000 characters.

Example App

To learn more about how to track leads with Supabase, check out the following example app:

Supabase + Next.js App Router Example

Check out a real-world example of this in action – Extrapolate uses Supabase Auth and Next.js App Router to track new user sign-ups.

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: A time-series view of the number clicks, leads and sales.

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.

Getting Started

Links

Analytics

Conversion tracking

Dub Partners

Integrations

Open source

Supabase

Prerequisites

React

Manual installation

Framer

Shopify

WordPress

Webflow

Google Tag Manager

Configure Supabase

Auth callback implementation

Example App

Supabase + Next.js App Router Example

View your conversions

​Prerequisites

React

Manual installation

Framer

Shopify

WordPress

Webflow

Google Tag Manager

​Configure Supabase

​Auth callback implementation

​Email signup without verification

​Example App

Supabase + Next.js App Router Example

​View your conversions

Prerequisites

Configure Supabase

Auth callback implementation

Email signup without verification

Example App

View your conversions