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.
See the Node-RED website for more details about it. There are also sites for custom nodes and example flows, documentation, a blog and a discussion forum. There is also a Slack group. You can also find some questions and answers on StackOverflow.
Node-RED allows us to create custom nodes to extend the features. While this is a great feature, actually writing the code can be tricky. In part because the code for the admin configuration panel is contained in an html file containing 3 script entries that are Node-RED specific. This post shows you a relatively easy way to split that into 3 files and combine them with a build step using an npm cross-platform script.
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.
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.
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.
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.
Excellent work has been done to make sure that new nodes are discoverable. Here is a quick way to easily search from your browser.
Node-RED tried to pass messages by reference not copy. Sometimes though, a copy is needed.
Some detail not included in the documentation.
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.
People seem to get very confused about file permissions when installing Node-RED and associated nodes. This article tries to set things straight.