# node-opcua > pure nodejs OPCUA SDK - module node-opcua Latest version **2.186.3** (published 2026-09-25) · MIT license · 0 weekly downloads ## Install ```sh npm install node-opcua pnpm add node-opcua yarn add node-opcua bun add node-opcua ``` ## Health **Score 55/100 (C)** — status: active. Positive: no vulnerabilities; recently updated; high maintenance score. Warnings: low downloads; no types; no esm support. ## Facts | | | |---|---| | Version | 2.186.3 | | Published | 2026-09-25 | | First published | 2014-01-22 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | none | | Module format | CommonJS | | Dependencies | 0 | | Known vulnerabilities | 0 | | Install scripts | no | | GitHub stars | 1659 | | Author | Etienne Rossignon | | Maintainers | erossignon | | Keywords | OPCUA, opcua, m2m, iot, opc ua, internet of things | ## Links - npm: https://www.npmjs.com/package/node-opcua - Repository: https://github.com/node-opcua/node-opcua - Homepage: http://node-opcua.github.io/ - Issues: https://github.com/node-opcua/node-opcua/issues - Funding: https://github.com/sponsors/erossignon - npm.io page: https://npm.io/package/node-opcua ## Recent versions - 2.186.3 (latest) — 2026-09-25 - 2.113.2 (patch) — 2023-12-23 - 2.67.1 (v2.67) — 2022-05-21 - 2.186.2 — 2026-09-24 - 2.186.1 — 2026-09-21 - 2.186.0 — 2026-09-20 - 2.185.0 — 2026-09-19 - 2.184.8 — 2026-09-17 - 2.184.7 — 2026-09-17 - 2.184.6 — 2026-09-17 - 2.184.5 — 2026-09-16 - 2.184.4 — 2026-09-15 - 2.184.3 — 2026-09-15 - 2.184.2 — 2026-09-14 - 2.184.1 — 2026-09-14 - … 403 more at https://npm.io/package/node-opcua/versions ## README # node-opcua [![NPM version](https://img.shields.io/npm/v/node-opcua)](https://www.npmjs.com/package/node-opcua) [![NPM downloads](https://img.shields.io/npm/dm/node-opcua.svg)](https://www.npmtrends.com/node-opcua) [![Node.js CI](https://github.com/node-opcua/node-opcua/actions/workflows/workflow.yml/badge.svg)](https://github.com/node-opcua/node-opcua/actions/workflows/workflow.yml) [![Coverage Status](https://img.shields.io/coverallsCoverage/github/node-opcua/node-opcua)](https://coveralls.io/r/node-opcua/node-opcua) **The most complete OPC UA stack for Node.js** — build industrial-grade OPC UA servers and clients in TypeScript. ## Why node-opcua? - 🏭 **Full OPC UA stack** — server, client, discovery, aggregation, and GDS - 🔒 **Production-grade security** — X.509 certificates, encrypted channels, user authentication - 🌍 **Cross-platform** — Windows, Linux, macOS, and browser (via WebSocket) - 📦 **120+ packages** — modular architecture, use only what you need - 🛡️ **Battle-tested** — 12+ years of development, 1,600+ GitHub stars, 3,000+ tests - 📖 **Well documented** — *NodeOPCUA by Example* book + API reference ## Quick Start **Requirements:** Node.js 20 or later ```bash npm install node-opcua ``` ### Create an OPC UA Server ```typescript import { OPCUAServer, DataType, Variant } from "node-opcua"; const server = new OPCUAServer({ port: 4840 }); await server.initialize(); const addressSpace = server.engine.addressSpace; if (!addressSpace) throw new Error("AddressSpace not initialized"); const namespace = addressSpace.getOwnNamespace(); namespace.addVariable({ browseName: "Temperature", componentOf: addressSpace.rootFolder.objects, dataType: DataType.Double, value: { get: () => new Variant({ dataType: DataType.Double, value: 22.5 }) }, }); await server.start(); console.log("Server started at", server.getEndpointUrl()); ``` ### Connect as an OPC UA Client ```typescript import { OPCUAClient, AttributeIds } from "node-opcua"; const client = OPCUAClient.create({ endpointMustExist: false }); await client.connect("opc.tcp://localhost:4840"); const session = await client.createSession(); const value = await session.read({ nodeId: "ns=1;s=Temperature", attributeId: AttributeIds.Value }); console.log("Temperature =", value.value.value); await session.close(); await client.disconnect(); ``` ## 🏢 Professional Support | | Community (MIT) | Professional | | ------------------------ | :----------------: | :------------------: | | Full documentation | ✅ | ✅ + extended docs | | Bug fixes | Best effort | **Priority SLA** | | CVE security advisories | After disclosure | **Early access — patch before public disclosure** | | Certifiable version | — | ✅ | | Dedicated consulting | — | ✅ | | Custom development | — | ✅ | [![Professional Support](https://img.shields.io/static/v1?style=for-the-badge&label=Professional&message=Support&labelColor=blue&color=green&logo=data:image/svg%2bxml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHhtbG5zOnhsaW5rPSJodHRwOi8vd3d3LnczLm9yZy8xOTk5L3hsaW5rIiB2ZXJzaW9uPSIxLjEiIGlkPSJMYXllcl8xIiB4PSIwcHgiIHk9IjBweCIgdmlld0JveD0iMCAwIDQ5MS41MiA0OTEuNTIiIHN0eWxlPSJlbmFibGUtYmFja2dyb3VuZDpuZXcgMCAwIDQ5MS41MiA0OTEuNTI7IiB4bWw6c3BhY2U9InByZXNlcnZlIj4NCjxnPg0KCTxnPg0KCQk8cGF0aCBkPSJNNDg3Ljk4OSwzODkuNzU1bC05My4xMDktOTIuOTc2Yy00LjgxMy00LjgwNi0xMi42NDItNC42Sinaptik-AI/pandas-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)](https://support.sterfive.com) Or [contact Sterfive](mailto:contact@sterfive.com) for dedicated consulting and enterprise needs. ## 📖 Documentation - **[NodeOPCUA by Example](https://leanpub.com/node-opcuabyexample-edition2024)** — the definitive guide with practical, ready-to-use examples - **[API Reference](https://node-opcua.github.io/api_doc/index.html)** — full TypeScript API documentation - **[Tutorials](https://github.com/node-opcua/node-opcua/tree/master/documentation)** — step-by-step guides in the main repository ## Value-Added Extensions Source-available companion modules available to [NodeOPCUA subscription members](https://support.sterfive.com) (additional fee): | Module | Description | | ------ | ----------- | | **node-opcua-pub-sub** | OPC UA PubSub over MQTT (Part 14) — Industry 4.0 ready | | **aggregator** | Combine and monitor hundreds of servers and millions of variables | | **node-opcua-optimized-client** | High-performance OPC UA client for demanding workloads | | **node-opcua-gds** | Global Discovery Server — certificate lifecycle at scale (Part 12) | | **node-opcua-modeler-ex** | Programmatic OPC UA modeler | 👉 Visit [support.sterfive.com](https://support.sterfive.com) for access and pricing. ## Ecosystem ### AI-Powered Modeling with MCP **[node-opcua-modeler-mcp-server](https://www.npmjs.com/package/node-opcua-modeler-mcp-server)** — an [MCP server](https://modelcontextprotocol.io) that gives AI agents access to the OPC UA companion specification type system. Discover types, resolve namespace dependencies, and look up engineering units. ```bash npx node-opcua-modeler-mcp-server ``` ### OPC UA Modeler **[OPC UA Modeler](https://github.com/node-opcua/opcua-modeler)** — write your information model in YAML, get standard NodeSet2.xml: create, validate, and generate OPC UA information models with full companion spec support. [Online editor](https://opcua-modeler.sterfive.io) · [Documentation](https://opcua-modeler.doc.sterfive.com/) ## :heart: Sponsors If you rely on node-opcua in production, please consider [sponsoring the project](https://github.com/sponsors/node-opcua). Your support funds long-term maintenance, new features, and representation at the OPC Foundation. ## License MIT — Copyright (c) 2014-2026 Etienne Rossignon / [Sterfive SAS](https://www.sterfive.com) See [LICENSE](./LICENSE) for details. --- _Source: https://npm.io/package/node-opcua · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._