determine what memory limits you have on nodejs

memory.js

# copied from https://stackoverflow.com/questions/73600496/heroku-node-js-app-allocation-failure-scavenge-might-not-succeed-with-memory-s

const v8 = require('v8');
// added the code below to a route that caused a memory leak
const heapStats = v8.getHeapStatistics();
const heapStatsMB = heapStats;
  for (const key in heapStatsMB) {
    heapStatsMB[key] = `${(((heapStatsMB[key] / 1024 / 1024) * 100) / 100).toFixed(2)} MB`;
    }
console.table(heapStatsMB);