How to Fix the Cannot Convert Array to Object[][] Error in Google Sheets Script

Learn how to resolve the "Cannot convert Array to Object[][]" error in your Google Sheets script when using Google Apps Script to sort data.
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How to Fix the Cannot Convert Array to Object[][] Error in Google Sheets Script

If you’ve ever worked with Google Sheets and tried to automate your workflow using Google Apps Script, you might have come across the error "Cannot convert Array to Object[][]”. This can be a bit puzzling, especially if you’re new to Google Apps Script. In this guide, we’ll guide you through understanding why this error happens and how you can fix it.

Understanding the Error

The error Cannot convert Array to Object[][] usually occurs when you attempt to assign a JavaScript array directly to a range in Google Sheets. In Google Apps Script, ranges are expected to be two-dimensional arrays (i.e., arrays of arrays). If you pass a one-dimensional array, the script throws this error because it expects an array-of-arrays structure.

Identifying the Problem Scenario

Consider the following example code:

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Correcting the Array Structure

To fix this error, you need to make sure that the array you are passing is two-dimensional. Here’s how you can ensure that:

Ensure two-dimensional structure: Even if you are working with a single column or single row, wrap your array within another array to maintain the two-dimensional structure.

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Creating a 2D array manually: If you need to create an array and populate it, ensure it is created as a 2D array from the beginning.

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Conclusion

The key to avoiding the "Cannot convert Array to Object[][]” error is to understand the data structure expected by Google Sheets. By ensuring that you are always working with two-dimensional arrays, you can prevent this error and make your scripts more robust.

Feel free to paste these examples into your Google Apps Script Editor and see how they work. With the right understanding and approach, such errors will become a thing of the past. Happy scripting!