Understanding the json.decoder Error in Python: What It Means and How to Fix It

---

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---

The Error Overview

In the code snippet provided, you encounter a specific version of this error - JSONDecodeError("Extra data", s, end). This suggests that there is extra data present in the JSON file that exceeds what is expected by the decoder.

The Cause of the Error

In your code, the error arises due to the following line:

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

By opening the file in append mode ('a'), you are trying to add new data into an existing JSON file. However, JSON does not support appending data without violating its structure. Here’s what happens:

When you append data to a JSON file, the integrity of the JSON structure is compromised.

The Solution

To resolve this error, you have two effective options:

1. Create a New JSON File Each Time

Instead of appending to an existing JSON file, save the output as a new file each time you run your code. This ensures that the structure of the JSON remains intact.

Modify the code like this:

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

By opening the file in write mode ('w'), you can overwrite any existing data ensuring a valid JSON file.

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

This method not only creates a new file every time but also ensures that the data is correctly formatted as JSON.

Conclusion

If you're looking to make your application loop infinitely to check for vaccine availability, you can consider implementing a simple infinite loop using while True around your vaccine_check() function.

Happy coding!