Populate Guilds

guilds.js

'use strict'

var uuid = require('uuid').v4
var Habitica = require('habitica')

var ENDPOINT = 'http://localhost:3000' // whatever your endpoint url is
var GUILD_ID = 'your-public-guild-id'
var NUMBER_OF_MEMBERS = 100

var count = 0

function makeNewUser () {
  var api = new Habitica({
    endpoint: ENDPOINT
  })
  var name = uuid()
  var email = name + '@example.com'
  var password = 'password'

  return api.register(name, email, password).then(function () {
    return api
  })
}

function joinGuild (api) {
  return api.post('/groups/' + GUILD_ID + '/join').then(function (res) {
    var guildName = res.data.name
    console.log(++count + ' user(s) have joined ' + guildName)
  })
}

function logError (err) {
  if (err.message) {
    console.error(err.message)
  } else {
    console.error(err)
  }
}

var promise = Promise.resolve()

for (var i = 0; i < NUMBER_OF_MEMBERS; i++) {
  promise = promise.then(makeNewUser).then(joinGuild)
}

promise.catch(logError)

package.json

{
  "name": "guilds_script",
  "version": "1.0.0",
  "description": "",
  "main": "guilds.js",
  "repository": {
    "type": "git",
    "url": "git+ssh://git@gist.github.com/5c8e1f8de9f6d370899b88c593d93751.git"
  },
  "keywords": [],
  "author": "Blade Barringer <blade@crookedneighbor.com> (http://crookedneighbor.com/)",
  "license": "MIT",
  "bugs": {
    "url": "https://gist.github.com/5c8e1f8de9f6d370899b88c593d93751"
  },
  "homepage": "https://gist.github.com/5c8e1f8de9f6d370899b88c593d93751",
  "dependencies": {
    "habitica": "^4.0.0-beta.1",
    "uuid": "^2.0.3"
  }
}

I've adjusted the script a little to catch and log any errors you might be receiving. Update it with the new file and see if it tells you anything.

In theory you can change the name section to var name = 'Test' + count, but since usernames and emails need to be unique, it'll fail to register a user if you run it a second time.The uuid function assures that it will be a random string of numbers and characters, so it won't fail to register the new users.