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Shirt Shop — Feature Flags using Next.js

Ecommerce product page example using Next.js, Flags SDK, and @vercel/toolbar to test showing free shipping and summer deal banners.

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Shirt Shop Flags SDK Example

This example uses the Flags SDK along with the Flags Explorer and @vercel/analytics.

Demo

https://shirt-shop.labs.vercel.dev/

How it works

This demo uses two feature flags defined in code control the visibility of two banners on the page. Both flags are configured to show/hide each banner 50% of the time.

Once you visit the page, you can see a variation of both/one/none of the banners. Since this example is using a stable id to identify users, you will see the same variation all the time.

To test different variations, you can use the Dev Tools at the bottom to reset the stable id and reload the page. This allows you to test different variations of the banners.

This templates also tracks analytics events in Vercel Analytics.

If you deployed your own instance of this example you can also use the Flags Explorer to test different variations by creating overrides.

Deploy this template

Step 1: Link the project

In order to use the Flags Explorer, you need to link the project on your local machine.

vercel link

Select the project from the list you just deployed.

Step 2: Pull all environment variables

This allows the Flags SDK and the Flags Explorer to work correctly, by getting additional metadata.

vercel env pull

Step 3: Install dependencies

npm install

Step 4: Run the project

npm run dev
GitHub Repovercel/flags
Use Cases
Ecommerce
Stack
Next.jsTailwind

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Build applications with AI

AI SDK

The AI Toolkit for TypeScript

AI Gateway

One endpoint, all your models

Vercel Agent

An agent that knows your stack

Sandbox

AI workflows in live environments

CI/CD

Helping teams ship 6× faster

Content Delivery

Fast, scalable, and reliable

Fluid Compute

Servers, in serverless form

Observability

Trace every step

Bot Management

Scalable bot protection

BotID

Invisible CAPTCHA

Platform Security

DDoS Protection, Firewall

Web Application Firewall

Granular, custom protection

Customers

Trusted by the best teams

Blog

The latest posts and changes

Changelog

See what shipped

Press

Read the latest news

Events

Join us at an event

Docs

Vercel documentation

Academy

Linear courses to level up

Knowledge Base

Find help quickly

Community

Join the conversation

Next.js

The native Next.js platform

Nuxt

The progressive web framework

Svelte

The web’s efficient UI framework

Turborepo

Speed with Enterprise scale

AI Apps

Deploy at the speed of AI

Composable Commerce

Power storefronts that convert

Marketing Sites

Launch campaigns fast

Multi-tenant Platforms

Scale apps with one codebase

Web Apps

Ship features, not infrastructure

Marketplace

Extend and automate workflows

Templates

Jumpstart app development

Partner Finder

Get help from solution partners

Platform Engineers

Automate away repetition

Design Engineers

Deploy for every idea