yusoltsev/obsidian-crdt-sync-server

obsidian-crdt-sync-server

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⚠️ Early development — This server is in active early development. Use at your own risk.

A self-hosted sync backend for the https://github.com/yegor-usoltsev/obsidian-crdt-sync Obsidian plugin. It keeps your vault state in one place so your devices can stay in sync without giving your notes to a third-party service.

What you get

• A real-time sync hub for every device: connect desktop, mobile, and other clients to the same vault state.
• Support for the full vault, not just note text: notes, attachments, folder structure, renames, moves, and deletes are all part of the sync model.
• SQLite-backed vault storage: the latest synced state is persisted locally, so the server keeps your vault between restarts.
• Consistent file identity across clients: the server validates structural changes so two devices do not quietly drift into conflicting paths or broken renames.
• Optional Git backups: you can periodically materialize the vault into a normal Git repository and push it to a remote for history and disaster recovery.
• Straightforward self-hosting: run it on your own infrastructure behind a reverse proxy, without relying on a third-party sync service.

Usage

Docker Compose (recommended)

Copy .env.example to .env and set AUTH_TOKEN:

sh
cp .env.example .env
# edit .env and set AUTH_TOKEN

Generate a token with:

sh
openssl rand -base64 32

Then start the server:

sh
docker compose up -d

Docker

sh
docker run -d \
  -p 3000:3000 \
  -v ./data:/data \
  -e AUTH_TOKEN="your-random-secret-at-least-32-chars" \
  -e DATA_DIR=/data/db \
  -e BACKUP_GIT_WORKTREE_DIR=/data/git \
  yusoltsev/obsidian-crdt-sync-server:latest

From source

sh
bun install
bun src/index.ts

Set environment variables via a .env file or export them before running. See .env.example for all options.

Environment Variables

Health Check

GET /health returns {"status":"ok"} with HTTP 200.

Security

• TLS: The server does not terminate TLS itself. Put it behind a reverse proxy (e.g. nginx, Caddy, Traefik) with a valid TLS certificate. Never expose it on a public network without TLS.
• Auth token: The shared token is the only authentication mechanism. Use a strong random value and rotate it if compromised.
• Data at rest: Vault data is stored unencrypted in SQLite. Secure the host and the DATA_DIR accordingly.
• Git backup credentials: BACKUP_GIT_PASSWORD is used as a plain HTTPS password or personal access token. Use a token with minimal required permissions.

Docker Images

This server is published as a multi-platform Docker image for linux/amd64 and linux/arm64.

Images are available from:

• https://hub.docker.com/r/yusoltsev/obsidian-crdt-sync-server
• https://github.com/yegor-usoltsev/obsidian-crdt-sync-server/pkgs/container/obsidian-crdt-sync-server

Releasing

Create a release tag from a clean main branch:

sh
bun run release patch
# or: bun run release minor
# or: bun run release major

The local release script computes the next semantic version from existing Git tags, creates the new X.Y.Z tag, and pushes it to GitHub.

The GitHub Actions release workflow then runs GoReleaser on that tag. GoReleaser installs dependencies, builds a bundled main.js, creates the GitHub release, and builds/publishes the Docker image to both Docker Hub and GHCR by copying only that file into the runtime image.

For a local dry run of the release pipeline:

sh
goreleaser release --snapshot --clean

For a plain local image build without GoReleaser:

sh
bun run build
docker build -t obsidian-crdt-sync-server:test .

Versioning

This project uses [***] Release tags use the plain X.Y.Z format and drive both GitHub releases and Docker image tags.

Contributing

Pull requests are welcome. For larger changes, open an issue first, especially if the change affects the wire protocol, on-disk storage format, or release packaging.

License

https://github.com/yegor-usoltsev/obsidian-crdt-sync-server/blob/main/LICENSE