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.

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How to create secure certificates

Generate certificates for Node-RED that are trusted by all modern browsers. This will let you access Node-RED (and other services) over an encrypted HTTPS link.


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How to secure Node-RED

Node-RED is increasingly used in situations that require reasonable security. Up to now, however, the information required to secure it correctly has been fragmented. This article aims to give an end-to-end outline to enable anyone to secure their installation.

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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.


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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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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.


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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.


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How node.send() works

Some detail not included in the documentation.

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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.


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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.


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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.