slack-block-kit
Slack Block Kit
Expert guide for building Slack UIs with Block Kit.
Overview
Block Kit is Slack's UI framework for creating rich, interactive messages, modals, and Home tabs. It uses a JSON-based structure with three main components:
- Blocks: Layout containers (Section, Actions, Input, Header, etc.)
- Elements: Interactive components (Buttons, Selects, Date pickers)
- Composition Objects: Text, options, and confirmations
Surfaces
Block Kit works on three surfaces:
| Surface | Max Blocks | Use Cases |
|---|---|---|
| Messages | 50 | Notifications, bot responses, channel posts |
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