Node Red

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📖 Kb | 📎 Development | 🔖 node-red

Using JSONata to transform msg data

JSONata is a syntax designed by IBM to help reformat and restructure JSON data in a similar vein to the way that XLST is used to transform XML data.


📖 Kb | 📎 Development, IoT | 🔖 node-red, iot, heating, home automation

Drayton Wiser heating control

Drayton are a very widely used manufacturer of heating controls. They make the “Wiser” control system which is low cost and easily fitted. This article shows you how to use Node-RED to query and control the system.

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📖 Kb | 📎 Development | 🔖 Node-RED

Node-RED Q & A

Node-RED Questions and Answers. Node-RED is a flow-based (visual) programming tool. These pages have some information that may be currently missing from the documentation or may expand on it.


📖 Kb | 📎 Development | 🔖 node-red

Easily search for contributed nodes on the Node-RED Flows site

Excellent work has been done to make sure that new nodes are discoverable. Here is a quick way to easily search from your browser.


📖 Kb | 📎 Development | 🔖 node-red

How to create a clone of a message object

Node-RED tried to pass messages by reference not copy. Sometimes though, a copy is needed.


📖 Kb | 📎 Development | 🔖 node-red

How node.send() works

Some detail not included in the documentation.

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📖 Kb | 📎 Development | 🔖 node-red

How to extract a table from HTML

While Node-RED has some nodes for extracting data from HTML, the nodes are rather simplistic. Here is a quick way to extract the data from an HTML table element.


📖 Kb | 📎 Development | 🔖 node-red

Installation and running permissions

People seem to get very confused about file permissions when installing Node-RED and associated nodes. This article tries to set things straight.


📖 Kb | 📎 Development | 🔖 node-red

Secure Home Automation Controls via a Telegram Bot

Shows how to create a secure set of home automation controls without exposing Node-RED to the Internet. It uses a Telegram bot with a number of pre-defined commands.


📖 Kb | 📎 Development | 🔖 node-red

Understanding the Node-RED Runtime API

Node-RED exposes an extensive API at runtime. While most of this is not available within your flows, much of it is available to custom nodes. Unfortunately, documentation for the API lags behind development. This page documents some of the key things I’ve learned about the API, what it does and how it works.