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  • Troubleshooting JavaScript Errors When Migrating from Firebase to Google Analytics 4

    Posted by Charlie on 23 May 2023 at 5:59 am

    “Hey there! I’ve been messing with some code here, trying to upgrade my old application from GoogleAnalytics3 to GoogleAnalytics4, using Firebase. Been following a bunch of tutorials and guides, but just not getting the results I’m expecting. No matter what I do, I keep running into console errors and, for some reason, nothing shows up on GA4.

    The application I’m working on uses Node.js 14.19 and it’s built using coffeescript(1.12.7) and webpack. Now it throws me a ‘TypeError: Cannot read properties of undefined (reading ‘id’)’ and ‘o is not a function’.

    Getting confused here and kinda need your help. Does anyone know what could possibly be causing these issues or how I could fix them?”

    Ava replied 11 months ago 3 Members · 2 Replies
  • 2 Replies
  • Ethan

    18 June 2023 at 6:46 pm

    The error messages you are seeing occur when the code tries to read or utilize a property or method from an undefined object in JavaScript. ‘TypeError: Cannot read properties of undefined (reading ‘id’)’ implies that the object that this ‘id’ property is tied to is undefined. Similarly, ‘o is not a function’ means that the program has attempted to invoke an entity ‘o’ that has not been specified as a function.

    This could be caused by several factors – firstly, it could be that you have a typo or error in your code that causes certain objects or functions to be undefined. Secondly, it could be that your Firebase implementation or the upgrade to GoogleAnalytics4 is not properly configured, making the references to these entities invalid.

    In order to diagnose and fix the problem, here is what I suggest:

    1. Double-check your code for any typos or errors, especially those related to the undefined entities.
    2. Review your Firebase setup and GoogleAnalytics4 upgrade process. Make sure the configurations are correct according to the official documentation.
    3. Try to isolate the issue. Run various parts of your application separately and find out which specific part is causing these errors to occur. This should help you narrow down your search for the error’s cause.

    Also, make sure to fully understand JavaScript Promises and async/await usage for Firebase since this is also a common place where errors occur.

  • Ava

    28 June 2023 at 4:46 am

    These errors you’re seeing are often due to attempted access or invocation of properties or methods from an undefined variable in your code. ‘TypeError: Cannot read properties of undefined’ implies that somewhere in your code, you might be trying to access the ‘id’ property of an object that is undefined. Similarly, ‘o is not a function’ implies that you’re trying to execute ‘o’ like a function while it’s not actually a function. These could occur due to errors in your conversion from Google Analytics 3 to 4, such as not correctly initializing a variable or missing parameters. Debugging the codebase to identify where these undefined references originate is a good start to resolve these issues. It is also possible that some parts of your application may not be compatible with Google Analytics 4 hence causing these issues. It would be a good idea to cross-check your implementation against the official documentation of Google Analytics 4 or Firebase. It’s always helpful to ensure the libraries and packages being used are updated and compatible with each other.

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