Single-file Markdown mindmap editor (File System Access API)
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The maker's introduction consists of the line above. Read the repository README for more details. Repository README ↗
Loading the full README.
Read the full README ↗A single-file, zero-build visual editor for a local folder of Markdown notes.
Every .md file becomes a card on an infinite canvas; edits are saved straight back to
disk as plain Markdown.
▶ Open the app — what it is for, and what it is not, is in docs/PRODUCT.md.
The deployed app is a single static index.html — no server, no backend, no runtime
dependencies. (Source lives in src/ and is bundled back into that one file at build
time; see Hosting below.) It's local-first: the map is saved in a private on-device
store (the browser's
Origin Private File System)
and reopens automatically every visit — no sign-in, no setup, works on every browser
including iPad. Notes never leave the machine.
Cards are linked parent → child; the tree and all edges are derived from each note's
mm_parent frontmatter — there is no stored edge list and no database. Layout, colours,
and positions live in the same frontmatter (mm_x, mm_y, mm_collapsed, mm_layout, …),
so a map travels with its files. Serialization only rewrites the app-owned keys and
preserves every other frontmatter field and the note body verbatim. One .md file per
node; the filename is the node's identity. The freehand sketch layer is the one exception —
it's stored as a single sketch.json data file beside the notes, as world-space polylines.
All file I/O goes through a single swappable store adapter (src/store/). Two
implementations share one interface:
opfsStore — the local-first on-device default (Origin Private File System). Works on
every browser incl. iPad; per-device, no built-in cross-device sync.fsaStore — a real local folder on Chrome/Edge (File System Access API), autosaved
directly. Point it at a cloud-synced folder (iCloud Drive, Dropbox, …) and the map lives
in that cloud with no app-side server config..zip import / export moves a map in and out (the inline ZIP reader/writer is
zero-dependency). Add ?nofsa to the URL to preview the no-local-folder (iPad-style)
layout on desktop.
src/ is split into domain folders, all fully strict-typed TypeScript: core/ (shared
mutable state + interaction ui), utils/ (pure helpers — Markdown, frontmatter, model
queries), store/ (the swappable I/O boundary), data/persistence.ts (autosave / load /
zip orchestration), view/ (camera, layout, edges, theme, icons), features/ (the
interactive subsystems — drag, gestures, inline-edit, crud, attachments, search, sketch,
history), and main.ts (the render + selection core). Replacing only the store object
would retarget the app to an Obsidian vault or a Tauri/native build.
A GitHub Action (.github/workflows/deploy.yml) bundles the source with Vite
(vite-plugin-singlefile) into a self-contained dist/index.html and deploys it to GitHub
Pages on every push to main. Pages "Source" is set to GitHub Actions in the repo
settings.
To run locally: npm install, then npm run dev (Vite dev server on localhost:5173).
The on-device store needs a secure context, so use the dev server rather than opening the
file directly. npm run build produces the deployable single-file dist/; npm run typecheck runs tsc --noEmit.
Tests: npm test checks the file format (vitest). npm run e2e drives the app in a real
browser (Playwright, e2e/); the first time, install its browser with
npx playwright install chromium.
The displayed version is set by the deploy workflow: 0.1.<GitHub run number>, so it
bumps automatically per deploy — local builds show 0.1.0-dev instead. It's shown at
the bottom of the home sidebar (home button, top left).
Open source under the MIT License.