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Add Vercel Web Analytics to your project #4

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4 changes: 4 additions & 0 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,8 +4,12 @@ const path = require('path');
const app = express();
const ejs = require('ejs');
const haikus = require('./haikus.json');
const { initializeAnalytics } = require('./lib/analytics');
const port = process.env.PORT || 3000;

// Initialize Vercel Web Analytics
initializeAnalytics();
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@chatgpt-codex-connector chatgpt-codex-connector bot Feb 19, 2026

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P1 Badge Avoid initializing analytics twice per page load

Calling initializeAnalytics() here while also hardcoding the Insights snippet in the EJS templates causes two independent initialization paths for the same tracker in Vercel deployments. When both paths are active, page views/events can be counted twice, which will skew analytics and any experiment decisions based on that data. Keep a single integration path (either inject()-based setup or template script tags) to prevent duplicated telemetry.

Useful? React with 👍 / 👎.


app.use(express.static('public'));
app.use(express.urlencoded({ extended: true }));
app.set('view engine', 'ejs');
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25 changes: 25 additions & 0 deletions lib/analytics.js
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Original file line number Diff line number Diff line change
@@ -0,0 +1,25 @@
/**
* Vercel Web Analytics Integration
*
* This module provides utilities for integrating Vercel Web Analytics
* with the Express application.
*/

const { inject } = require('@vercel/analytics');

/**
* Initializes Vercel Web Analytics
* Should be called once during application startup
*/
function initializeAnalytics() {
try {
inject();
console.log('Vercel Web Analytics initialized');
} catch (error) {
console.error('Failed to initialize Vercel Web Analytics:', error.message);
}
}

module.exports = {
initializeAnalytics,
};
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