Imagine a collaborative project where you have your data stored on a shared Google Spreadsheet.  Anybody, anywhere can access and edit this document with permission.  Imagine this spreadsheet having locational parameters (latitudes and longitudes) and temporal attributes (date).  Imagine if you could then use this very spreadsheet to dynamically feed a geo-temporal map viewer web application…

To imagine this even happening, let’s take the first step of actually finding out how to extract data from a given Google Spreadsheet as a JSON feed using javascript.

Step 1: Prepare your Google Spreadsheet

  1. In your google spreadsheet, click on the “share” button and choose “Anyone on the internet can find and view”
    Screen Shot 2014-10-16 at 11.26.07 AM
  2. Go to “File”, “Publish to the web…” and publish the entire spreadsheet

Step 2: Building the URL string

  1. Get the ID of the spreadsheet:
    Take note of the current spreadsheet URL in your web-browser.  It should look something like this:
    browser2
    The highlighted part of the URL is the spreadsheet ID.
  2. Get the ID of the specific worksheet:
    This is a bit harder to get.  First, you will have to use the spreadsheet ID from the previous step and replace the spreadsheetID in the following URL string with the spreadsheet ID which you just found:
    Replace the spreadsheetID parameter with the ID obtained in the previous step, plug the url into a web browser.  Traverse the JSON object that is returned to find the child element for “entry”
    Screen Shot 2014-10-16 at 12.03.13 PM
    If you are using the first worksheet in your google doc, and if have made no changes to the name of the sheet, you will find an entry with title “Sheet 1”, and the worksheetID would be “od6”.  If you made changes to the spreadsheet, or are using a different sheet, you will need to scroll down further to find the correct worksheetID.
  3. Now that you have the spreadsheet ID and the worksheet ID, plug them into the following URL string:

Step 3: Using the JSON feed with jQuery+LeafletJS

Now that we have the ability to extract data from a Google Spreadsheet as a dynamic JSON object, we can build a web application that utilizes the data feed.  Here is an example: