Crawl over a ldif file and make a csv of users with a column for each group they're a member of.

csv-dump.js

'use strict'

const fs = require('fs');
const os = require('os');

const file = fs.readFileSync('./dump.txt', 'utf8').split(os.EOL);
const people = [];
const groups = new Set();

var current_person = false;
for (const line of file) {
  if (/^dn: /.test(line)) {
    if (current_person) {
      people.push(current_person);
    }
    current_person = {
      user: line.substr(4).split(',')[0].substr(4),
      groups: [],
    }
  }
  if (/^memberOf: /.test(line)) {
    const group = line.substr(10).split(',')[0].substr(3);
    current_person.groups.push(group);
    groups.add(group);
  }
}
const sortedGroups = Array.from(groups).sort();
console.log('Name,' + sortedGroups.join(','));
people.forEach(person => {
  process.stdout.write(`${person.user},`);
  sortedGroups.forEach(group => {
    process.stdout.write(`${person.groups.includes(group) ? group : ''},`);
  });
  process.stdout.write(os.EOL);
});