# node-opcua/node-opcua

Unlocking the Full Potential of OPC UA with Typescript and NodeJS - http://node-opcua.github.io/

Repository: https://github.com/node-opcua/node-opcua
Canonical: https://ross.abutalabs.com/products/node-opcua
Language: TypeScript
License: MIT
License Family: permissive
Topics: iot-platform, opc-ua, node-opcua, nodejs, javascript, iiot, m2m, iec-62541, industrial-automation, industry-4, manufacturing, energy, transport, instrumentation, cybersecurity, opcua, cryptography, typescript
Last push: 2026-08-26T15:19:23+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 4606, "days_push": 7, "days_rel": 13, "gap_med": 9.5, "n_releases_24m": 39}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1654, forks 517 (observed 2026-08-28T04:05:17.208977+00:00)

## What it is
node-opcua is a full OPC UA (IEC 62541) protocol stack for Node.js and the browser, written in TypeScript. It provides client, server, discovery, and aggregation components with built-in security policies, encryption, and certificate management.

## Use cases
- build an OPC UA server to expose industrial sensor data
- connect to a PLC or SCADA system as an OPC UA client
- read and write OPC UA nodes from a Node.js application
- implement secure encrypted industrial communication with certificates
- monitor manufacturing equipment data in an Industry 4.0 setup
- browse an OPC UA address space and subscribe to data changes
- run an OPC UA client in the browser

## When to choose
- you need a complete, production-tested OPC UA stack in JavaScript/TypeScript
- you are building industrial automation, IIoT, or M2M integrations on Node.js
- you need client and server implementations with full security policy support
- you want cross-platform deployment including Windows, Linux, macOS, and browser

## When to avoid
- your devices use Modbus, MQTT, or other non-OPC-UA protocols
- you need a lightweight embedded OPC UA stack for microcontrollers rather than Node.js
- your project does not run on Node.js 20 or above

## Facets
- artifact type: library
- maturity: stable
- function: sdk, networking, cryptography, security
- domain: iot, developer-tools, apis
- platform: cross-platform, browser, windows
- tags: opc-ua, opcua, industrial-automation, iiot, m2m, industry-4, typescript, iec-62541, client-server, nodejs, linux, macos

## Member repositories
- node-opcua/node-opcua (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:17.208977+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 2026-08-30T03:44:56.232281+00:00, confidence not recorded.
  - readme: https://github.com/node-opcua/node-opcua (fetched 2026-08-28T04:05:17.208977+00:00, sha 9d25f0cc614a)
- Data as of 2026-08-30T08:39:29.467469+00:00.