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Build Twitch Messaging Interface integrations in JavaScript with the tmi.js library.
About tmi.js
tmi.js is a JavaScript library for the Twitch Messaging Interface. It allows a client to connect with a bot username and OAuth token, join specified channels, listen for chat messages, and send replies. It can be installed with npm for Node.js and used as a prebuilt script in the browser, with TypeScript definitions available in a separate package.
Key features
- Connect with bot username and OAuth token
- Join listed channels and receive chat messages
- Send channel messages in response to commands
- Enable debug output through client options
- Install for Node.js with npm i tmi.js
- Load prebuilt script that exposes window tmi
Best for: Developers building Twitch chat bots and messaging integrations in JavaScript.
Good for
- Open source with MIT license
- Supports Node.js and browser use
- Includes example for listening and replying to messages
tmi.js at a glance
- Website
- github.com/tmijs/tmi.js
- Category
- Social & Communities › Twitch Tools
- 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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tmi.js FAQ
How do I install tmi.js for Node.js?
Run $ npm i tmi.js, then require('tmi.js') in your project.
How do I connect to a Twitch channel?
Create a new tmi.Client with identity username, OAuth password, and channels array, then call client.connect().
Where are TypeScript type definitions available?
Install them separately with $ npm i -D @types/tmi.js.
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