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The Lumen Editor toolbar is entirely data-driven — you describe what buttons to show and how to group them by passing an array to the toolbar option, and the editor renders the corresponding controls. There is no separate plugin registration or imperative API needed for built-in commands: if a command name appears in the array, the button appears in the UI; if it does not, the button is absent.

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Toolbar format

The toolbar option accepts an array of groups. Each group is itself an array of command name strings. The editor renders a visual divider between groups, giving you a natural way to separate related controls:
You can include as many or as few groups as you need, and each group can contain any combination of the built-in command names listed below.

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Built-in commands

Lumen Editor ships with 17 built-in commands that cover the most common rich text needs.

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Minimal toolbar example

For lightweight editing surfaces — such as a comment box or a short bio field — you might only need a handful of commands:
This produces two groups separated by a single divider: one for inline formatting and one for inserting links.

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Disabling the toolbar

Pass an empty array to hide the toolbar entirely and present a clean, toolbar-free editing surface:
You can also omit the toolbar key altogether, in which case the editor falls back to its built-in default group arrangement.
Need buttons the built-in set does not cover? Register a plugin with editor.use(plugin) to define custom commands, then include your command names in the toolbar array just like built-in ones. See the Plugin API reference for the full plugin interface.