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Deployment Modes

Local experimentation

Recommended backend:

  • in_memory for quick local request/validation testing.

Characteristics:

  • No persistence: data is lost on process restart.
  • Single-process state only.
  • Not suitable for horizontal scaling or replica failover.
  • Supports replay and watch in-process, limited by local memory retention.
  • For local JetStream testing, see Installation — Local JetStream.
  • For a quick end-to-end behavior check, see Getting Started — Run the Smoke Test.

Production-like / persistent mode

Recommended backend:

  • jetstream

Characteristics:

  • Durable message storage.
  • Retention and size limits.
  • Replica support (requires clustered NATS setup).
  • Supports replay and live streaming workflows.

Recommended packaging/deployment for Kubernetes:

Selection guideline

  • Need persistence/replay/streaming robustness: use jetstream.
  • Need fastest setup for local functional checks only: use in_memory (node-local replay/watch).