Log in to your Gridly account and navigate to the workspace where the data you want to export is located. Ensure you have the necessary permissions to view and export the data.

Identify and select the specific grid or grids you need to export. You can do this by clicking on the grid name in the workspace to open it. Review the data to ensure it is ready for export.

Use the built-in export feature in Gridly to export the selected grid data as a CSV file. Click on the export option, usually found in the toolbar or menu, and choose CSV as the export format. Save the CSV file to a convenient location on your local machine.

Open the exported CSV file using a spreadsheet application like Microsoft Excel, Google Sheets, or a text editor. Review the data to ensure that all necessary fields are included and that the format is correct. Make any necessary adjustments to the data, such as removing unnecessary columns or cleaning up entries.

Use a script or a built-in tool within your text editor to convert the CSV data to JSON format. If you're comfortable with scripting, you can write a small script in Python to perform this conversion. Here's a basic example using Python:

```python
import csv
import json

csv_file_path = 'your_file.csv'
json_file_path = 'your_file.json'

# Read CSV file
with open(csv_file_path, mode='r', encoding='utf-8') as csv_file:
csv_reader = csv.DictReader(csv_file)
data = list(csv_reader)

# Write to JSON file
with open(json_file_path, mode='w', encoding='utf-8') as json_file:
json.dump(data, json_file, indent=4)
```

Adjust the file paths as necessary, and ensure that your CSV file is formatted correctly for this script to work.

Open the newly created JSON file in a text editor or a JSON validator tool to ensure the data has been converted correctly. Check for any syntax errors or formatting issues that might have occurred during conversion.

Save the verified JSON file to your preferred local directory. Ensure it's backed up if necessary, and organize it in a way that makes it easy to access and use for your project or application.