The Distributed Systems & Network Topology Simulator runs a tick-based, pure-TypeScript simulation of request traffic flowing through a topology you assemble from clients, load balancers, API gateways, microservices, message queues, distributed databases and caches — entirely in your browser, with no real network calls.

Each tick, client nodes originate requests that are routed through the graph: load balancers pick a downstream target (round robin, weighted, or least connections), API gateways and microservices gate traffic through a Hystrix/Resilience4j-style circuit breaker, queues buffer and drain messages at a configured rate, caches serve a TTL-decaying hit ratio, and databases model master-replica, quorum or Raft consensus topologies.

Chaos actions let you kill a node, partition it from the network, add packet loss (5-50%), inject a latency spike (500ms+), or force a circuit breaker open — then watch per-node status, latency and error-rate metrics react live on the graph and in the metrics tables below it.

Raft-backed databases expose a genuine split-brain lesson: quorumSize configured as a true majority of replicaCount makes split-brain structurally impossible even under a partition, while a misconfigured quorumSize lets two partition groups both elect a leader — the exact failure mode real Raft deployments are built to prevent.

Once you're happy with a topology, the Export tab generates a Docker Compose file, Kubernetes Deployment/Service manifests, and Mermaid or PlantUML architecture diagram code — starter scaffolding to sketch the shape of a real system, not a deploy-ready stack.