A small script to unfollow non-mutuals on Mastodon (useful if you need to do some cleaning)

index.js

const Masto = require('mastodon');
const fs = require('fs')

const M = new Masto({
  access_token: 'ACCESS_TOKEN',
  api_url: 'https://YOUR-INSTANCE.TLD/api/v1/'
});

function getNextPage(req) {
  return (req.headers && req.headers.link && req.headers.link.includes('rel="next"')) ? req.headers.link.split(/<([^>]+)>/)[1] : null;
}

function toCsv(accountsArray) {

  return [
    ['id', 'handle', 'url', 'Toots', 'Following', 'Followers', 'Created at'],
    ...accountsArray.map(i => [
      i.id,
      i.moved ? i.moved.acct : i.acct,,
      i.moved ? i.moved.url : i.url,
      i.statuses_count,
      i.following_count,
      i.followers_count,
      i.created_at
    ])
  ].map(i => i.join(',')).join('\n')
}

(async () => {

  const accountRequest = await M.get('accounts/verify_credentials');
  const {id} = accountRequest.data;

  const accounts = new Map();

  let lastData = await M.get(`accounts/${id}/following`)
  lastData.data.forEach(i => {
    accounts.set(i.id, i)
  })

  while (getNextPage(lastData.resp)) {
    const nextPageUrl = getNextPage(lastData.resp);
    console.log('fetching ', {nextPageUrl})
    lastData = await M.get(nextPageUrl)
    lastData.data.forEach(i => {
      accounts.set(i.id, i)
    })
  }

  console.log('done!!')
  console.log('found', accounts.size, 'accounts followed')

  const ids = Array.from(accounts.keys());

  const relationshipReq = await M.get('accounts/relationships', {id: ids});
  const {data} = relationshipReq;

  const nonMutuals = data.filter(i => i.following && !i.followed_by).map(i => accounts.get(i.id));

  fs.writeFileSync('./non-mutuals.csv', toCsv(nonMutuals), {encoding: 'utf8'});

  console.log(`Wrote list of ${nonMutuals.length} non-mutuals to ./non-mutuals.csv`);

  // for (acct of nonMutuals) {
  //   await M.post(`/accounts/${acct.id}/unfollow`)
  //   console.log('Unfollowed ', acct.acct)
  // }
})();

package.json

{
  "name": "masto-mutuals",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "mastodon": "^1.2.2"
  }
}