OPC-UA Browser

A CLI and interactive TUI for browsing OPC-UA servers, built with Node.js and TypeScript.

Features

• Split-pane TUI: node tree on the left, live details on the right
• Live value monitoring: all variables are subscribed automatically; values update in real time
• COV log: per-variable timestamped change log
• Write support: edit writable variables with inline error feedback
• Search/filter: filter the current node list by name
• CLI mode: dump root folder contents to stdout

Installation

Global install

npm install
npm run build
npm install -g .

Then use it from anywhere:

opcua-browser --tui opc.tcp://localhost:4840

Local

npm install
npm run build

Usage

CLI mode

npm start -- opc.tcp://localhost:4840

Prints Node ID, Browse Name, Display Name, Node Class, and for variables: Data Type, Current Value, Access Level.

TUI mode

npm start -- --tui opc.tcp://localhost:4840

TUI keybindings

Navigation

| Key | Action | |-----|--------| | ↑ / ↓ | Move cursor | | Enter / → | Browse into selected node | | ← / Backspace | Go back to parent | | / | Search / filter current list | | q / Ctrl+C | Quit |

Variables

| Key | Action | |-----|--------| | e | Write new value (writable variables only) | | r | Refresh value from server | | s | Toggle COV log (timestamped change history) |

Write dialog

| Key | Action | |-----|--------| | Enter | Submit value | | Esc | Cancel |

Values are entered as JSON — e.g. 25.5, true, "hello".

Search

| Key | Action | |-----|--------| | / | Enter search mode | | Enter | Confirm filter and return to navigation | | Esc | Clear filter and return to navigation |

Development

npm run dev    # run directly with ts-node (no build step)
npm run build  # compile TypeScript → dist/
npm start      # run compiled version
npm run clean  # remove dist/