This will list all forks of any repo in a given Github organization

list-forks.js

const Promise = require("bluebird")
const Octokit = require('@octokit/rest')
const octokit = new Octokit({auth: 'YOUR_TOKEN_HERE'})
const per_page = 25
const repos = {}
const your_org = 'YOUR_ORG_HERE'

function forRepos(processor, page = 1) {
  return octokit.repos.listForOrg({
    org: your_org,
    per_page,
    page
  }).then(({ data, status, headers }) => {
    return processor(data).then(() => {
      if (data.length == per_page) return forRepos(processor, page + 1);
    })
  })
}

function forForks(owner, repo, processor, page = 1) {
  return octokit.repos.listForks({
    owner,
    repo,
    per_page,
    page
  }).then(({ data, status, headers }) => {
    return processor(data).then(() => {
      if (data.length == per_page) return forForks(owner, repo, processor, page + 1);
    })
  })
}

forRepos(data => {
  return Promise.each(data, (repo) => {
    const num_forks = repo.forks_count
    if (num_forks > 0) {
      const org = repo.owner.login
      const repo_name = repo.name
      repos[repo_name] = {
        org,
        num_forks,
        forks: []
      }
      return forForks(org, repo_name, forkData => {
        return Promise.each(forkData, (fork) => {
          repos[repo_name].forks.push({
            owner: fork.owner.login,
            name: fork.name,
            num_forks: fork.forks_count,
            private: fork.private
          })
        })
      })
    }
  })
})
.then(() => {
  Object.keys(repos).forEach(repo_name => {
    const repo = repos[repo_name]
    if (repo.num_forks != repo.forks.length) console.log('WARNING: ' + repo.name + ' did not return the correct number of forks.')
    repo.forks.forEach(fork => {
      const meta = []
      if (fork.num_forks > 0) meta.push('WARNING[repo has been forked.]')
      if (!fork.private > 0) meta.push('WARNING[repo is public.]')
      if (fork.name != repo_name) meta.push('ORIG[' + repo_name + ']')
      console.log(fork.owner + '/' + fork.name + ' ' + meta.join(';'))
    })
  })
})