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What is Moleculer?

Moleculer is a fast, modern and powerful microservices framework for Node.js. It helps you to build efficient, reliable & scalable services. Moleculer provides many features for building and managing your microservices.


  • Promise-based solution (async/await compatible)
  • request-reply concept
  • all nodes are equal, no master/leader node
  • multiple services on a node/server
  • support event-driven architecture with balancing
  • built-in service registry & dynamic service discovery
  • load balanced requests & events (round-robin, random, cpu-usage, latency, shard)
  • many fault tolerance features (Circuit Breaker, Bulkhead, Retry, Timeout, Fallback)
  • plugin/middleware system
  • support versioned services
  • service mixins
  • support Streams
  • built-in caching solution (memory, MemoryLRU, Redis)
  • pluggable loggers (Console, File, Pino, Bunyan, Winston, Debug, Datadog, Log4js)
  • pluggable transporters (TCP, NATS, MQTT, Redis, AMQP, NATS Streaming, Kafka)
  • pluggable serializers (JSON, Avro, MsgPack, Protocol Buffers, Thrift)
  • pluggable validator
  • built-in metrics with reporters (CSV, Prometheus, Datadog, StatsD, Events)
  • built-in tracing support with exporters (Zipkin, Jaeger, Datadog, Events)
  • parameter validation with fastest-validator
  • official API gateway, Database access and many other modules…

How fast?

We spent a lot of hours to improve the performance of Moleculer and create the fastest microservices framework for Node.js.

Benchmark local
Benchmark remote

Check the results on your computer! Just clone this repo and run npm install && npm start.

Check out our benchmark results.


Until Moleculer reaches a 1.0 release, breaking changes will be released with a new minor version. For example 0.13.1, and 0.13.4 will be backward compatible, but 0.14.0 will have breaking changes.

Node.js support

Moleculer follows Node.js release cycles meaning that the minimum required version is 10.