Slack Block Kit is Slack's official framework for creating structured, interactive messages, modals, home tabs, and workflows in Slack apps. It uses JSON-based "blocks" to compose visually rich interfaces with elements like text, images, buttons, select menus, date pickers, and dividers, enabling developers to build engaging experiences without full custom apps. Widely used for bots, notifications, forms, and dashboards, it supports interactivity via actions and views for seamless user flows.
Key Features
- Blocks & Layouts: Section, image, actions, context, divider, input blocks for modular composition.
- Interactive Elements: Buttons, menus, checkboxes, radio buttons, date/time pickers with action triggers.
- Surfaces: Messages, modals, home tabs, and workflow steps for different contexts.
- Block Kit Builder: Visual playground for prototyping and generating JSON code.
- Accessibility: Built-in support for screen readers and keyboard navigation.