Retrieve all my subscriptions in Google Sheets - google-apps-script

Question

I'm using YouTube Data API v3 and Google Apps Script for retrieve all my subscriptions.
The problem I'm facing is that - using the following code, the response brings duplicated channels:
do {
const mySubsResponse = YouTube.Subscriptions.list('snippet', {
mine: true,
//channelId: "<MY_CHANNEL_ID>",
maxResults: 50,
fields: "pageInfo(totalResults),nextPageToken,items(snippet(title,resourceId(channelId)))"
});
if (!mySubsResponse || mySubsResponse == undefined) {
Logger.log('No subscriptions found.');
SpreadsheetApp.getUi().alert("No subscriptions found.");
break;
}
// Loop all my subscriptions found in the response:
for (let j = 0; j < mySubsResponse.items.length; j++) {
const mySubItem = mySubsResponse.items[j];
sheet.getRange("H" + incrSub).setValue(mySubItem.snippet.title);
sheet.getRange("I" + incrSub).setValue(mySubItem.snippet.resourceId.channelId);
incrSub++;
}
nextPageToken = mySubsResponse.nextPageToken;
} while (nextPageToken);
I believe this is due each item in the response is actually the video uploaded by the channel I'm subscribed to - I don't think it's a problem with the page token.
In the code above, I've commented the channelId parameter and I've testted with both: mine:true and channelId:<MY_CHANNEL_ID> and, the totalResults shows me I have 479 subscriptions, but, when I'm looping the results,
For example, I'm subscribed to the channel called "Channel_1"; this
channel had uploaded three videos today. The response of the code
above brings me "Channel_1" three times, when it should be only 1 -
because I'm subscribed to "Channel_1" once.
What I want to get is a list of all channels I'm subscribed to.
I've checked the subscriptions:list documentation, but, it's not clear how I can get my subscriptions only.
If the subscriptions:list endopint is not the correct one for this task, which endpoint enables me to bring the desired results?1
1a list of all channels I'm subscribed to.

Answer 1

After checking more closely (and, I admit, after a little break I have), I finally found the problem and the solution:
The problem is: I wasn't using the nextPageToken in every loop, so, basically, I was requesting the same page without actually making any pagination.
In this section:
const mySubsResponse = YouTube.Subscriptions.list('snippet', {
mine: true,
//channelId: "<MY_CHANNEL_ID>",
maxResults: 50,
fields: "pageInfo(totalResults),nextPageToken,items(snippet(title,resourceId(channelId)))"
});
Can be seen that the pageToken: nextPageToken is not defined.
Then, the solution is:
Modify the code for sending the nextPageToken obtained.
This is the modified code:
// Call my subscriptions:
/** Token pagination. */
var nextPageToken = "";
/** Row position where to start writing the results. */
var incrSub = 6;
/**
* Get all my subscriptions.
*/
do {
const mySubsResponse = YouTube.Subscriptions.list('snippet', {
channelId: "<MY_CHANNEL_ID>", // also works with "mine: true".
maxResults: 50,
// Here, the first time the call is made, the "nextPageToken" value
// is empty. In every iteration (if "nextPageToken" is retrieved),
// the "nextPageToken" is used - in order to get the next page.
pageToken: nextPageToken,
fields: "nextPageToken,items(snippet(title,resourceId(channelId)))"
});
if (!mySubsResponse || mySubsResponse == undefined) {
Logger.log('No subscriptions found.');
SpreadsheetApp.getUi().alert("No subscriptions found.");
break;
}
// Write the subscriptions returned in the response:
for (let j = 0; j < mySubsResponse.items.length; j++) {
const mySubItem = mySubsResponse.items[j];
sheet.getRange("H" + incrSub).setValue(mySubItem.snippet.title);
sheet.getRange("I" + incrSub).setValue(mySubItem.snippet.resourceId.channelId);
incrSub++;
}
// Check the token:
try {
if (mySubsResponse.nextPageToken != null || mySubsResponse.nextPageToken != undefined) {
nextPageToken = mySubsResponse.nextPageToken;
} else {
nextPageToken = undefined;
break;
}
} catch (ex_page) {
// An error occurred. Check closely the code.
}
} while (nextPageToken != undefined);
With this modified code, all of my subscriptions are returned successfully.