Browser ↔ local daemon communication — without WebSocket code.
Stop debugging reconnects, NAT issues, and flaky user networks.
Sideband is for apps that run a local process (daemon, agent, service) and need a browser UI to talk to it — reliably, securely, and beyond localhost.
Early-stage. APIs may evolve. If you're building on this, reach out — feedback shapes the protocol.
Most apps only need @sideband/peer. Lower-level packages are for custom transports and advanced use cases.
| Package | Role |
|---|---|
@sideband/peer |
High-level SDK |
@sideband/protocol |
Wire format, frame types, codecs |
@sideband/transport |
Transport ABI and shared utilities |
@sideband/runtime |
Peer lifecycle, routing, subscriptions |
@sideband/rpc |
Typed RPC layer |
@sideband/secure-relay |
E2EE relay protocol |
@sideband/transport-browser |
Browser WebSocket transport |
@sideband/transport-node |
Node/Bun transport |
@sideband/cli |
Developer CLI |
bun install # Install dependencies
bun test # Run testsRequires Bun ≥ 1.3.
- Getting Started — build your first browser ↔ daemon connection
- Protocols — SBP wire format, SBRP E2EE, and RPC envelope specs
- Code: Apache-2.0
- Docs: CC BY 4.0