@matrajs/core

A headless rich text editor framework. Engine, document model, extension API and starter kit — framework-agnostic and MIT.

npm i @matrajs/core

import { createEditor, starterKit } from '@matrajs/core'

const editor = createEditor({ extensions: starterKit, content: '<p>Hello</p>' })
editor.mount(element)
editor.commands.toggleHeading(2)

What makes it different

Commands are inferred. editor.commands is built from the definitions you pass — no module augmentation, no registry, no generics to thread. Calling a command no extension defines is a compile error.

The engine stays hidden. The document is plain JSON and no engine type appears in a public signature. editor.unsafe is the escape hatch and is excluded from semver.

Positions survive time. ctx.mark() returns a marker that re-resolves a range through every edit made since it was taken — the reason a three-second-late AI response lands on the right words instead of corrupting the paragraph.

In the box

Seventy-nine extensions, every one importable on its own and none of them in your bundle unless you pass it: the starter kit, text style, tables with row and column commands, task lists, callouts, collapsible toggles, YouTube and sandboxed embeds, search and replace, autolink, emoji, indent, clear formatting, code highlighting, a drag handle, comments, mentions, slash menus, bubble and floating menus, Markdown in and out, a table of contents, unique ids, a file handler, image resizing, locked blocks, template fields with a mail merge that needs no editor, snippets, columns, page breaks, line height, text direction, footnotes, math, text case, invisible characters, selection highlight, typewriter scrolling, autosave, smart paste, hashtags, ghost-text completion and dictation. The directory with the line you would write for each is at https://matrajs.com/extensions.

Companions

• @matrajs/react, @matrajs/vue, @matrajs/svelte, @matrajs/solid — bindings, each one thin

• @matrajs/ai — streaming edits that survive concurrent typing

• @matrajs/collab — authority, rebasing and remote cursors

• @matrajs/versions — snapshots, a real diff, restore as one undo step

• @matrajs/mcp — this documentation as an MCP server, for any AI tool

• Docs: https://matrajs.com

• Source: https://github.com/amrelaco/matra

MIT.