Build cross-platform Mastodon and Fediverse integrations with TootSDK, a Swift library.
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Build JavaScript integrations with the Mastodon API using masto.js, a universal client library.
About masto.js
masto.js is an open-source JavaScript client library for the Mastodon API, published as the npm package masto. It provides a REST API client configured with an instance URL and an access token, and the same code works in Node.js, browsers and Deno. It is written in TypeScript and ships type definitions.
Typical use is building Mastodon bots, integrations or web clients; the repository's quick-start example creates a client and publishes a status. The documented setup requires Node.js 22.x or later and npm 9.x or later, with TypeScript 5.0.0 or later as an optional peer dependency. Authentication uses a personal access token generated from an application in your own Mastodon instance settings, and requests go to the instance URL you configure; the project advises storing that token securely.
Key features
- Works in Node.js, browsers and Deno
- Written in TypeScript with type definitions included
- Around 6 kB minified and gzipped
- Tested with full coverage against a real Mastodon server
- REST API client built from an instance URL and access token
- Migration guides for upgrading across major versions
Best for: JavaScript and TypeScript developers building bots, tools or clients that interact with the Mastodon API.
Good for
- Open source and distributed under the MIT license
- Same client code targets Node.js, browsers and Deno
- Maintained by its author since 2018 and used by clients such as Elk and Phanpy
Watch out for
- Requires Node.js 22.x or later and npm 9.x or later for the documented setup
- Needs a personal access token created from an application in your Mastodon instance settings
masto.js at a glance
- Website
- github.com/neet/masto.js
- Category
- Social & Communities › Fediverse
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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masto.js FAQ
Which runtimes does masto.js support?
It is described as universal and works in Node.js, browsers and Deno.
What dependencies are required for the quick start?
Node.js 22.x or later and npm 9.x or later; TypeScript 5.0.0 or later is an optional peer dependency. Other package managers such as yarn or pnpm can be used to install it.
How do you authenticate with masto.js?
Create an application in your Mastodon instance's settings under Development to obtain a personal access token, choose scopes such as read and write for most functionality, then pass the instance URL and token when creating the client.
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