unfollow.js

(async () => {
  const { Octokit } = await import("@octokit/rest");

  // create a personal access token at https://github.com/settings/tokens/new?scopes=user:follow&description=Unfollow+Script+Token
  const octokit = new Octokit({ auth: `your_token_with_correct_permission` });

  async function unfollowNonFollowers() {
    const username = 'your_username';

    // Get list of users who are following you
    const followers = await octokit.paginate(octokit.rest.users.listFollowersForUser, { username });
    const followerLogins = followers.map(user => user.login);

    // Get list of users you are following
    const following = await octokit.paginate(octokit.rest.users.listFollowingForUser, { username });
    const followingLogins = following.map(user => user.login);

    let unfollowedCount = 0;

    // Unfollow users who are not following you
    for (const user of followingLogins) {
      if (!followerLogins.includes(user)) {
        await octokit.rest.users.unfollow({ username: user });
        unfollowedCount++;
      }
    }

    // Log the total number of unfollowed users
    console.log(`unfollowed ${unfollowedCount} users`);
  }

  unfollowNonFollowers().catch(console.error);
})();