The node-opcua ecosystem

Beyond the main SDK, node-opcua is part of a family of open-source and commercial modules and tools, maintained by Sterfive.

Featured

New from the project.

node-opcua-modeler-mcp-server

Lets AI agents (Claude, Cursor, and other MCP-compatible tooling) query, validate, and build OPC UA information models. Discover companion specification types, resolve namespace dependencies, look up engineering units. The first Model Context Protocol server for industrial automation.

Core libraries

Featured node-i3x · An implementation of the CESMII Industrial Information Interoperability eXchange (i3X) API for Node.js, bridging OPC UA address spaces to i3X context models.
node-opcua · The main client and server SDK.
node-opcua-pki · PKI and certificate management for OPC UA.
node-opcua-crypto · Certificate tools, encryption, and signature support.

Companion specifications

node-opcua-isa95 · ISA-95 extension for node-opcua server.

Tooling

opcua-commander · OPC UA client with a blessed (ncurses) terminal UI.
bench-opcua · Performance benchmarks for OPC UA servers.
node-opcua-sampleserver · A simple reference OPC UA server based on node-opcua.
node-opcua-htmlpanel · Small HTML panel for displaying monitored variables.

Related projects

node-wot-opcua-tools · Tools for bridging (node-)WoT and (node-)OPCUA.
node-opcua-sample · A simple OPC UA sample client demonstrating SDK usage.