Shopify Storefront API with Next.js Middleware

Next.js Middleware allows you to run code at the edge before a request reaches your Next.js page, making it perfect for intercepting Shopify Storefront API traffic. You can easily implement custom authentication checks, geo-targeting redirects, or A/B testing logic before the Storefront API is even called. This is typically deployed on Vercel's edge network to ensure low-latency responses for your custom storefront.

To ensure Shopify webhooks process correctly, you must configure your Next.js Middleware matcher to exclude API routes. You can use the matcher export in your middleware.ts file to bypass the edge function for requests hitting /api/webhooks. Failing to bypass these routes can cause unwanted delays or timeouts when Shopify attempts to send real-time order or inventory updates.

While the official Next.js Commerce starter kit integrates seamlessly with Shopify, you do not strictly need it to utilize Middleware. You can manually configure the Shopify Storefront API in any existing Next.js application and deploy your own custom edge functions. Using the Storefront API requires a Shopify Storefront access token, which you can generate directly from your Shopify admin dashboard.

Yes, Middleware is highly effective for custom authentication checks before passing requests to the Shopify Storefront API. By validating customer session tokens at the edge, you can protect specific routes or custom pricing logic. If a token is invalid, the Middleware can instantly redirect the user to a login page without ever pinging Shopify's servers.