DeleteCloudWatchSubscriptions.js

const AWS = require('aws-sdk');
AWS.config.update({ region: 'us-east-1' });
const timer = require('timers/promises'); // Only avail in nodejs v16+
var cloudwatchlogs = new AWS.CloudWatchLogs({ apiVersion: '2014-03-28' });

(async function () {
  let nextToken = null;
  do {
    const logGroupsResponse = await cloudwatchlogs
      .describeLogGroups({ limit: 10, nextToken: nextToken })
      .promise();

    // Do something with the retrieved log groups

    for (const group of logGroupsResponse.logGroups) {
      console.log(group);
      var params = {
        filterName: 'subscription filter name',
        logGroupName: group.logGroupName,
      };

      var desparams = {
        logGroupName: group.logGroupName /* required */,
      };

      const logGrpInfo = await cloudwatchlogs.describeSubscriptionFilters(desparams).promise();

      if (logGrpInfo.subscriptionFilters.length > 0) {
        try {
          await cloudwatchlogs
            .deleteSubscriptionFilter(params, function (err, data) {
              if (err) {
                console.log('Error', err.code);
              } else {
                console.log('Success', data);
              }
            })
            .promise();
        } catch (error) {}
      }

      await timer.setTimeout(1000); // avoid hitting rate limit
    }

    // Get the next token. If there are no more log groups, the token will be undefined
    nextToken = logGroupsResponse.nextToken;
  } while (nextToken);
})();