How to Modify JSON Data in Google Cloud Storage Using Cloud Functions and Python

Learn how to effectively modify existing JSON files stored in Google Cloud Storage using Cloud Functions. Discover the correct approach to handle JSON data and avoid common errors in Python.
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Modifying JSON Data in Google Cloud Storage Using Cloud Functions and Python

If you're working with Google Cloud and you need to modify the key values in an existing JSON file stored in Cloud Storage using Cloud Functions, you've come to the right place. In this guide, we will guide you through the process and help you overcome common pitfalls.

The Problem

You have a JSON file in your Google Cloud Storage bucket that looks like this:

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

You want to update the stuID field with a new value, but when you attempt to run your code, you encounter the following error:

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

This error typically arises when trying to write a dictionary directly to a file without converting it to a string format that can be understood by the file writer.

Solution Overview

Let's break down the solution into manageable sections so you can learn how to modify your JSON effectively without encountering the TypeError.

1. Set Up Your Cloud Function

Make sure you have a Cloud Function set up to trigger whenever changes are made to your storage bucket. In the hello_gcs function, you will handle events from Cloud Storage.

Here’s a basic outline:

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

This function captures the name of the file and the bucket, which will be passed to the modify_json function for processing.

2. Modify the JSON Data

The modify_json function will be responsible for:

Downloading the current JSON file.

Modifying the required field.

Uploading the modified JSON back to Cloud Storage.

Here’s how it should look:

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

3. Key Changes Explained

Modifying the Field: You change the value for stuID as desired.

4. Test Your Function

Once your function is correctly set up, upload a new JSON file or trigger an event to see your Cloud Function in action. The stuID should now be updated without leading to errors.

Conclusion

Feel free to explore further ideas to utilize Cloud Functions for enhancing your cloud storage operations. If you have any questions or need assistance, don't hesitate to ask in the comments below!