How to connect Mastodon and schedule posts on any instance

In short: Mastodon is a federation of independently operated servers. Connection starts with your instance URL, not an assumption that every account lives on mastodon.social.

Choose the URL where you use the account and review its content and media policies. From Accounts, select Mastodon, enter the instance, and approve OAuth on that server. Naasher requests account read, status write, media upload, and notification-read access.

What can be scheduled?

The composer currently validates 500 characters, up to four images or one video, alt text, threads, and polls. Do not mix image and video media in one post. Select visibility deliberately and use content warnings when appropriate.

Mastodon documents publishing at POST /api/v1/statuses, including polls, visibility, content warnings, and native scheduled_at. Naasher publishes through its worker and uses stable identifiers to prevent duplicate retries.

Instance differences matter

An instance can restrict app registration, change upload limits, or require account approval. If connection fails on a private server, inspect its version and OAuth policy rather than repeatedly changing the account password.

Federated communities value context and accessibility. Write a complete introduction, add useful alt text, and be present for replies after the scheduled post goes out.

Compare this OAuth flow with the app-password workflow in the Bluesky guide.