# moleculerjs/moleculer

:rocket: Progressive microservices framework for Node.js

Repository: https://github.com/moleculerjs/moleculer
Canonical: https://ross.abutalabs.com/products/moleculer
Homepage: https://moleculer.services/
Language: JavaScript
License: MIT
License Family: permissive
Topics: microservices, microservice, nodejs, distributed-systems, moleculer, microservice-framework
Last push: 2026-08-22T08:03:22+00:00

## Health v2 (maintenance only)
Score: 86/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 62, longevity 100
- inputs: {"age_days": 3484, "days_push": 11, "days_rel": 43, "gap_med": 310.0, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6376, forks 602 (observed 2026-08-28T04:09:42.918488+00:00)

## What it is
Moleculer is a fast, progressive microservices framework for Node.js that helps build efficient, reliable, and scalable distributed services. It provides built-in service discovery, load balancing, fault tolerance, caching, and pluggable transporters, serializers, and loggers.

## Use cases
- build microservices in Node.js
- set up service discovery and a service registry
- implement request-reply and event-driven communication between services
- add circuit breaker, retry, and timeout fault tolerance to distributed services
- build an API gateway in front of microservices
- load balance requests and events across service nodes
- add metrics and distributed tracing to services
- connect services over NATS, MQTT, Kafka, Redis, or AMQP

## When to choose
- you are building a microservices architecture in Node.js
- you need built-in service discovery, load balancing, and fault tolerance without extra infrastructure
- you want pluggable transporters and serializers to fit your existing messaging stack
- you need a master-less, scalable distributed system with metrics and tracing out of the box

## When to avoid
- you are building a small monolith where a simple web framework suffices
- your team is not using Node.js or JavaScript
- you need a framework with a guaranteed 1.0 stable API, since pre-1.0 minor versions may include breaking changes
- you require a framework with a large corporate backing rather than a community-driven project

## Facets
- artifact type: framework
- maturity: stable
- function: microservices, rpc, message-queue, caching, api-framework, middleware, monitoring, tracing, service-discovery
- domain: microservices, backend, web-development, developer-tools
- platform: cross-platform
- tags: microservices-framework, service-registry, event-driven, fault-tolerance, load-balancing, circuit-breaker, pluggable-transporters, api-gateway, nodejs

## Member repositories
- moleculerjs/moleculer (main) score 86

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:42.918488+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:45:10.771264+00:00, confidence not recorded.
  - readme: https://github.com/moleculerjs/moleculer (fetched 2026-08-28T04:09:42.918488+00:00, sha 00ce5c8de8fa)
  - homepage: https://moleculer.services/ (fetched 2026-08-29T08:42:29.902548+00:00, sha aaaf72ac4632)
  - site_page: https://moleculer.services/docs/0.15 (fetched 2026-08-29T08:42:29.911440+00:00, sha f435f3e17dc2)
  - site_page: https://moleculer.services/docs/benchmark (fetched 2026-08-29T08:42:29.913262+00:00, sha 2e540b6995c9)
- Data as of 2026-08-30T08:39:29.467469+00:00.