Encountering a TypeError in NextJS: "Uncaught window.fbq is not recognized as a function"

Trying to implement Facebook Pixel for event tracking on the client side within my NextJS app-router project.

Following the instructions provided in the NextJS pixel repository: https://github.com/vercel/next.js/tree/canary/examples/with-facebook-pixel/app

I've placed a pixel.js script in the public/scripts directory. Within my layout.tsx, I have incorporated the FacebookPixel Component. I also have a file named fpixel.js in my library folder.

However, whenever I try to log an event using the pixel, an error occurs. Usage:

import * as fbq from "../../../library/third-party/fpixel"
// ...
      fbq.event("Purchase", { currency: "GBP", value: 1 });

The error message displayed in the browser is: 

TypeError: window.fbq is not a function
This error points to the fpixel.js file, which conveniently exports the event method for our use.

Why am I encountering this issue? Any assistance would be greatly appreciated.

typescriptfacebooknext.jswindowfacebook-pixel

Answer №1

Based on my analysis, switching to strategy="beforeInactive" might cause the script to not work as intended. One suggestion is to include scripts in the matcher if you are utilizing middleware.js in your application.

Answer №2

As of now, the example for the Next/FB-pixel on github within the Facebook Pixel component is displaying the following code snippet:

<Script

    id="fb-pixel"
    src="/scripts/pixel.js"
    strategy="afterInteractive"
    ...

This caused an issue with the pixel loading after components that contain pixel logic (and have dependencies). To resolve this issue, the strategy was switched to beforeInactive in order to load the pixel more quickly.

For more information, you can visit: https://nextjs.org/docs/app/api-reference/components/script#optional-props

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