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Get Started

This quickstart will show you how to get started with Edge Flags in a Next.js project.

1. Create a redis database

Go to console.upstash.com/redis and create a new global database.

After creating the db, copy the UPSTASH_REDIS_REST_URL and UPSTASH_REDIS_REST_TOKEN to your .env file.

2. Create a flag

Open the self-hosted edge flags dashboard using npx in the same directory and add your database.

npx @upstash/edge-flags-dashboard

You can also use the hosted version at https://edge-flags-dashboard.vercel.app.

Create a new flag using the dashboard and enable it. Then you can add some rules.

Created Flag

In this case, the flag has a percentage and 2 rules. For 80% of the users the flag will be evaluated. For the other 20% the flag will immediately return false without evaluating the rules.

  • The first rule is a geo targeting rule. It will enable the flag for users in Germany or the United Kingdom.
  • The second rule is a custom attribute rule. It will enable the flag for users with the attribute userId set to chronark.

Rules are evaluated from top to bottom. If a rule matches, the flag will return the configured value and stop evaluating the remaining rules.

If neither rule matches, the flag will return false

Make sure you have enabled the flag by clicking on the toggle button in the top right corner.

Now lets use the flag in our Next.js project.

3. Install dependencies

npm install @upstash/edge-flags

4. Create an edge function in your project

// /api/edge-flags/route.ts
import { createEdgeHandler } from "@upstash/edge-flags";

export const GET = createEdgeHandler({
  cacheMaxAge: 0, // cache time in seconds, 0 disables the cache
  redisUrl: process.env.UPSTASH_REDIS_REST_URL!, // omit to load from env automatically
  redisToken: process.env.UPSTASH_REDIS_REST_TOKEN!, // omit to load from env automatically
});

export const runtime = "edge";

5. Query the flag in your frontend

// /app/page.tsx
import { useFlag } from "@upstash/edge-flags";

export default function Example() {
  const { isEnabled, isLoading, error } = useFlag("flag-name");

  if (error) return <div>Error: {error}</div>;
  if (isLoading) return <div>Loading...</div>;

  return <div>Is my feature enabled: {isEnabled}</div>;
}

For more information about client side usage, see here.