Скачать или смотреть How to Resolve the No Firebase App '[DEFAULT]' has been created Error in Your React Native App

In this guide, we address the common Firebase error message: `No Firebase App '[DEFAULT]' has been created`, providing a step-by-step solution to properly initialize Firebase in your React Native application.
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This video is based on the question https://stackoverflow.com/q/68470035/ asked by the user 'Ayush Kumar' ( https://stackoverflow.com/u/13899155/ ) and on the answer https://stackoverflow.com/a/68470101/ provided by the user 'Dharmaraj' ( https://stackoverflow.com/u/13130697/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding Firebase Initialization Error in React Native Apps

When building applications with Firebase, setting up the environment correctly is crucial. If you're a developer using React Native, you may have encountered the frustrating error:

[[See Video to Reveal this Text or Code Snippet]]

This error indicates that your app is trying to access Firebase services without being initialized properly. In this post, we will guide you through how to fix this issue and set up Firebase correctly in your React Native application.

What Causes This Error?

This error commonly occurs when:

The Firebase app is not initialized before any Firebase service is used.

The initialization code is incorrectly placed or missing.

To resolve this error, you must ensure that Firebase is initialized correctly at the start of your application and that you use the exported Firebase services properly.



Step-by-Step Solution

We will be breaking this down into clear steps to ensure a smooth setup.

Step 1: Create a firebase.js File

The first step is to create a dedicated file for Firebase initialization. This helps in maintaining clean code and ensures that Firebase is initialized just once.

Create a new file named firebase.js in your project directory.

Inside firebase.js, populate it with the following code:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Updating App.js

Next, modify your App.js file to utilize the firebase.js file you just created.

Remove any redundant Firebase imports.

Import the necessary Firebase services:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Adjust Your Database Calls

Now, update your actions to use the firestore instance imported from your firebase.js. For example, your fetching function will now look like this:

[[See Video to Reveal this Text or Code Snippet]]



Conclusion

By following the steps outlined above, you should be able to resolve the No Firebase App '[DEFAULT]' has been created error and ensure that Firebase services function correctly in your React Native app.

Important Takeaway: Always initialize Firebase once, preferably in a dedicated file, and import the services you need in your components or actions. This practice not only prevents errors but also keeps your code base cleaner and more manageable.

If you have any further questions or run into issues, feel free to leave a comment below! Happy coding!