Error: JSON parsing error encountered for token < at position 0 within the context of Google Sheets Apps Script Tutorial

I'm currently working through a Google Sheets Apps Scripts editor tutorial and I've reached module 4. Unfortunately, I've encountered an issue with the code I copied directly from the module. The error message I'm seeing is: SyntaxError: Unexpected token < in JSON at position 0. It seems like there may be an extra '<' character somewhere that needs to be removed, but I haven't been able to locate it through a search. I suspect the problem might be related to the responseText that JSON is fetching. The error is occurring specifically at line 94:

function fetchApiResourceObject_(url) {
  // Make request to API and get response.
  var response =
    UrlFetchApp.fetch(url, {'muteHttpExceptions': true});

  // Parse and return the response as a JSON object.
  var json = response.getContentText();
  var responseObject = JSON.parse(json); 
  return responseObject; 
}

You can find the full code here:

Thank you.

Answer №1

Make sure to validate the output from response.getContextText() as it might be in a different format than anticipated.

There is a method called getAs mentioned in the Mozilla documentation: https://developers.google.com/apps-script/reference/url-fetch/http-response#getAs(String), although its relevance in this scenario is uncertain.

I suggest incorporating some console.logs to verify the URL and confirm that the JSON response is indeed in valid JSON format.

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