Stop Showing the Wrong Currency

Let's be honest: nothing kills an international conversion rate faster than showing a European customer a pricing page in US Dollars, or forcing a Japanese user to mentally convert from British Pounds. If you're building a global SaaS or e-commerce site, you need to show the local currency immediately. But doing IP geolocation on the frontend is notoriously tricky. Heavy local databases like MaxMind slow down your server, and the free APIs out there are heavily rate-limited or inaccurate. Today, I’m going to show you how to build a dynamic React hook in Next.js that detects a user's location and currency in under 50ms using a single API call. The Strategy We’re going to use the Core Web Utilities API. I love this specific tool because it's written in Rust, runs on AMD EPYC servers, and returns an insane amount of data (including the local currency) from a single IP lookup. The Code Let's create a custom React Hook called useUserLocation. This hook will ping our API when the component m