Suddenly Getting 403 Errors ... on a Public Spreadsheet

I have a publicly shared spreadsheet (I can open it up in Incognito Mode just fine). I have a script, written with google-spreadsheet, which updates that spreadsheet. It used to work great.

Now however when I try to use the library I get 403 errors:

Error: Google API error - [403] The caller does not have permission
    at createError (/home/me/project/node_modules/axios/lib/core/createError.js:16:15)
    at settle (/home/me/project/node_modules/axios/lib/core/settle.js:17:12)
    at IncomingMessage.handleStreamEnd (/home/me/project/node_modules/axios/lib/adapters/http.js:269:11)
    at IncomingMessage.emit (node:events:539:35)
    at endReadableNT (node:internal/streams/readable:1345:12)
    at processTicksAndRejections (node:internal/process/task_queues:83:21)

… which makes no sense, because again the spreadsheet is public: no one should get a 403 when accessing it. Plus, I am giving access to the script when I access the sheet:

const doc = new GoogleSpreadsheet(spreadsheetUrl);
const credentials = JSON.parse(await readFile(CREDENTIALS_PATH, 'utf8'));
await doc.useServiceAccountAuth(credentials);
await doc.loadInfo(); // loads document properties and worksheets

(where CREDENTIALS_PATH is a working path to a credentials JSON file from Google).

Is there any possibility this library could be reporting false 403 errors, because again it shouldn’t even possible to get legitimate ones on a public spreadsheet.

[Productivix]

Hi Theo, nice concrete proposal, thanks. I beg your pardon ,your program works well : I made a mistake in my sheet sharing “full shared” I had selected : reading only . I made a test with “editor” and it works well as you documented (https://theoephraim.github.io/node-google-spreadsheet/#/?id=the-basics) - that is solved for me May be @machineghosh , you made the same mistake ?

[Productivix]

Hi, I made tests today with this very clear lib, thanks to Theo, and I have only access in reading (no adding, update) on a full shared GGsheet.