# senecajs/seneca

A microservices toolkit for Node.js.

Repository: https://github.com/senecajs/seneca
Canonical: https://ross.abutalabs.com/products/seneca
Homepage: http://senecajs.org
Language: JavaScript
License: MIT
License Family: permissive
Topics: javascript, seneca, microservices, node
Last push: 2026-08-17T22:39:57+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 98, release rhythm 8, longevity 100
- inputs: {"age_days": 5795, "days_push": 16, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3959, forks 308 (observed 2026-08-28T04:08:30.552040+00:00)

## What it is
Seneca is a microservices toolkit for Node.js that lets you organize business logic as message-based commands selected by JSON pattern matching. It provides transport independence and a deep plugin ecosystem so services can communicate without knowing each other's location or implementation.

## Use cases
- build microservices in node.js
- decouple business logic from transport
- pattern match json messages to commands
- compose app functionality from plugins
- build message-based distributed systems
- organize node.js backend code into services

## When to choose
- you want a mature, pattern-matching message framework for Node.js microservices
- you need transport independence between services
- you prefer plugin-based composition of business logic

## When to avoid
- you need a modern actively evolving microservices framework with broad community momentum
- you want HTTP/REST-first API frameworks rather than message-based patterns
- your team prefers conventional service discovery over pattern matching

## Facets
- artifact type: framework
- maturity: maintenance
- function: microservices, message-queue, rpc, plugin-system, middleware
- domain: microservices, backend, developer-tools
- platform: -
- tags: pattern-matching, message-based, transport-independent, plugin-ecosystem, business-logic, nodejs, javascript

## Member repositories
- senecajs/seneca (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:30.552040+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 2026-08-29T18:24:28.700948+00:00, confidence not recorded.
  - readme: https://github.com/senecajs/seneca (fetched 2026-08-28T04:08:30.552040+00:00, sha 4ecb1c2ffb76)
  - homepage: http://senecajs.org (fetched 2026-08-29T09:18:18.490735+00:00, sha 1ed1eb3d75ef)
  - site_page: https://senecajs.org/docs (fetched 2026-08-29T09:18:18.499659+00:00, sha ee59dbb1fe31)
  - site_page: https://senecajs.org/getting-started (fetched 2026-08-29T09:18:18.503532+00:00, sha 5e64884e3c2c)
  - site_page: https://senecajs.org/faq (fetched 2026-08-29T09:18:18.501679+00:00, sha 33e29afc26ac)
- Data as of 2026-08-30T08:39:29.467469+00:00.