Tracking custom events

Learn how to send custom analytics events from your application.

Table of Contents

Next.js (/app)

Custom Events are available on Pro and Enterprise plans

Vercel Web Analytics allows you to track custom events in your application using the track() function. This is useful for tracking user interactions, such as button clicks, form submissions, or purchases.

Make sure you have version 1.1.0 or later of @vercel/analytics installed.

Tracking a client-side event

To track an event:

Make sure you have @vercel/analytics version 1.1.0 or later installed
Import { track } from @vercel/analytics
In most cases you will want to track an event when a user performs an action, such as clicking a button or submitting a form, so you should use this on the button handler
Call track and pass in a string representing the event name as the first argument. You can also pass custom data as the second argument:

component.ts

import { track } from '@vercel/analytics';
 
// Call this function when a user clicks a button or performs an action you want to track
track('Signup');

This will track an event named Signup.

For example, if you have a button that says Sign Up, you can track an event when the user clicks the button:

components/button.tsx

import { track } from '@vercel/analytics';
 
function SignupButton() {
  return (
    <button
      onClick={() => {
        track('Signup');
        // ... other logic
      }}
    >
      Sign Up
    </button>
  );
}

Tracking an event with custom data

You can also pass custom data along with an event. To do so, pass an object with key-value pairs as the second argument to track():

component.ts

track('Signup', { location: 'footer' });
track('Purchase', { productName: 'Shoes', price: 49.99 });

This tracks a "Signup" event that occurred in the "footer" location. The second event tracks a "Purchase" event with product name and a price.

Limitations

The number of custom data properties you can pass is limited based on your plan
Nested objects are not supported
Allowed values are strings, numbers, booleans, and null
Event name, key, and values must be no longer than 255 characters each

Tracking a server-side event

In scenarios such as when a user signs up or makes a purchase, it's more useful to track an event on the server-side. For this, you can use the track function on API routes or server actions.

To set up server-side events:

Make sure you have @vercel/analytics version 1.1.0 or later installed
Import { track } from @vercel/analytics/server
Use the track function in your API routes or server actions
Pass in a string representing the event name as the first argument to the track function. You can also pass custom data as the second argument

For example, if you want to track a purchase event:

app/actions.ts

'use server';
import { track } from '@vercel/analytics/server';
 
export async function purchase() {
  await track('Item purchased', {
    quantity: 1,
  });
}

Last updated on April 26, 2024

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