January 2018
Intermediate to advanced
336 pages
7h 22m
English
Content preview from Node.js 8 the Right WayBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Developing a Node-RED Flow
When you develop a program in Node-RED, it’s called a flow. The Hello World of Node-RED flows consists of a button that, when clicked, outputs a timestamp to the debug console. We’ll start with this simple flow so you can get comfortable with the Node-RED interface before we move on to developing an HTTP API.
To begin, take a look at the left pane of the Node-RED interface. This shows the kinds of nodes you’ll use to construct flows, categorized by their purposes.
Input nodes act as sources of events into the system. You can tell an input node visually by the tiny gray rectangle protruding from its right-hand side. This gray rectangle is an output port.
If you hover over a node, a tooltip will pop up to give you more ...
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