Book Image

Practical Node-RED Programming

By : Taiji Hagino
5 (1)
Book Image

Practical Node-RED Programming

5 (1)
By: Taiji Hagino

Overview of this book

Node-RED is a free and open source flow-based programming tool used to handle IoT data that allows programmers of any level to interconnect physical I/O, cloud-based systems, databases, and APIs to build web applications without code. Practical Node-RED Programming is a comprehensive introduction for anyone looking to get up to speed with the Node-RED ecosystem in no time. Complete with hands-on tutorials, projects, and self-assessment questions, this easy-to-follow guide will help you to become well versed in the foundations of Node-RED. You’ll learn how to use Node-RED to handle IoT data and build web applications without having to write complex code. Once you’ve covered the basics, you’ll explore various visual programming techniques and find out how to make sample flows as you cover web development, IoT development, and cloud service connections, and finally build useful real-world applications. By the end of this book, you’ll have learned how to use Node-RED to develop a real-world application from scratch, which can then be implemented in your business.
Table of Contents (19 chapters)
Section 1: Node-RED Basics
Section 2: Mastering Node-RED
Section 3: Practical Matters

Creating your own node

Before developing a node, there is something you need to know first. The following policies are set for node development. Let's follow these and develop a node.

When creating a new node, you need to follow some general rules. They adhere to the approach adopted by the core nodes and provide a consistent user experience.

You can check the rules for creating a node on the official Node-RED website:

Node program development

Node-RED nodes consist of two files: a JavaScript file that defines processing and an HTML file that provides a UI such as a setting screen. In the JavaScript file, the processing of the node you create is responsible for is defined as a function. This function is passed an object that contains node-specific properties. The HTML file describes the property settings screen displayed by the Node-RED flow editor. The settings values entered on the property settings screen displayed in this...