掌握Node-RED实战编程：物联网与Web应用开发指南

Node-Red

node.js

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《PDF：实践Node-RED编程》是一本由Taiji Hagino编著的专业书籍，隶属于Packt出版社于2021年3月22日发行。这本书的ISBN号码是9781800201590，主要关注于Node-RED，这是一种免费且基于开源流程的编程工具，特别适用于处理物联网（IoT）数据。Node-RED的核心价值在于其直观的可视化编程能力，使得开发者，无论编程水平高低，都能轻松地连接物理输入/输出、云端系统、数据库以及API，从而构建无需编写大量代码的Web应用程序。书中内容涵盖了全面的入门教程，通过一系列动手实践项目和自我评估问题，帮助读者深入理解Node-RED的基础知识。学习者将学会如何利用Node-RED处理IoT数据，创建功能强大的Web应用，即使对编程不熟悉的用户也能上手。作者将引导读者探索可视化编程的各种技巧和最佳实践，同时还会涉及到Web开发、IoT开发以及与云服务的集成，通过实际示例流程，一步步构建出实用的应用。本书的重点在于实战技能的培养，不仅理论扎实，而且强调应用到现实世界中的场景。读者将从零开始，学习如何用Node-RED开发出真正能落地的企业级应用程序，并将其应用于实际工作环境中。版权方面，所有内容未经Packt Publishing事先书面许可，不得任何形式复制、存储或传播。尽管作者和出版商尽力确保信息的准确性，但书中的信息不提供任何形式的保修，且作者、Packt Publishing及其经销商和分销商不对因本书导致的直接或间接损失负责。此外，Packt Publishing在书中尽可能正确地标记了提到的所有公司和产品的商标信息，但并不保证这些信息的准确性。该书适合任何想要快速理解和掌握Node-RED技术，尤其是对物联网和Web应用开发感兴趣的读者，无论是初级开发人员还是希望提升现有技能的专业人士。通过阅读这本书，读者不仅能提升自己的编程技能，还能紧跟物联网和云计算时代的步伐，开发出创新的解决方案。

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Preface

Node-RED is a ow-based programming tool that was made by Node.js. is tool is

mainly used for connecting IoT devices and soware applications. However, it can cover

not only IoT but also standard web applications.

Node-RED is expanding as a no-code/low-code programming tool. is book covers the

basics of how to use it, including new features that have been released from version 1.2, as

well as advanced tutorials.

Who this book is for

is book is best for those who are learning about soware programming for the rst time

with no-code/low-code programming tools. Node-RED is a ow-based programming

tool, and this tool can build web applications for any soware applications easily, such as

IoT data handling, standard web applications, web APIs, and so on. So, this book will help

web application developers and IoT engineers.

What this book covers

Chapter 1, Introducing Node-RED and Flow-Based Programming, teaches us what Node-

RED is. e content also touches on ow-based programming, explaining why Node-RED

was developed and what it is used for. Understanding this new tool, Node-RED, is helpful

to improve our programming experience.

Chapter 2, Setting Up the Development Environment, covers setting up the development

environment by installing Node-RED. Node-RED can be installed for any OS Node.js can

run, such as Windows, macOS, Rasberry Pi OS, and so on. We install Node-RED on each

environment with the command line or using the installer. is chapter covers important

notes for specic OSes.

Chapter 3, Understanding Node-RED Characteristics by Creating Basic Flows, teaches us

about the basic usage of Node-RED. In Node-RED, various functions are used with parts

called nodes. In Node-RED, we create an application with a concept called a ow, like a

workow. We will create a sample ow by combining basic nodes.

viii Preface

Chapter 4, Learning the Major Nodes, teaches us how to utilize more nodes. We will not

only learn about the nodes provided by Node-RED by default but also how to acquire

various nodes published on the internet by the community and how to use them.

Chapter 5, Implementing Node-RED Locally, teaches us best practices for leveraging Node-

RED in our local environment, our desktop environment. Since Node-RED is a tool based

on Node.js, it is good at building server-side applications. However, servers aren't just on

beyond the network. It is possible to use it more conveniently by using Node-RED in a

virtual runtime on the local environment of an edge device such as Raspberry Pi.

Chapter 6, Implementing Node-RED in the Cloud, teaches us best practices for leveraging

Node-RED on a cloud platform. Since Node-RED is a tool based on Node.js, it is good at

building server-side applications. It is possible to use it more conveniently by using Node-

RED on any cloud platform, so we will make ows with Node-RED on IBM Cloud as one

of the use cases with cloud platforms.

Chapter 7, Calling a Web API from Node-RED, teaches us how to utilize the web API from

Node-RED. In order to maximize the appeal of web applications, it is essential to link

with various web APIs. Its application development architecture is no exception in Node-

RED. Understanding the dierence between calling a web API from a regular Node.js

application and calling it from Node-RED can help us get the most out of Node-RED.

Chapter 8, Using the Project Feature with Git, teaches us how to use source code version

control tools in Node-RED. With Node-RED, the project function is available in version

1.x and later. e project function can be linked with each source code version control

tool based on Git. By versioning the ows with the repository, our development will be

accelerated.

Chapter 9, Creating a ToDo Application with Node-RED, teaches us how to develop

standard web applications with Node-RED. e web application here is a simple ToDo

application. e architecture of the entire application is very simple and will help us

understand how to develop a web application, including the user interface, using Node-

RED.

Chapter 10, Handling Sensor Data on the Raspberry Pi, teaches us application development

methods for IoT data processing using Node-RED. Node-RED was originally developed

to handle IoT data. erefore, many of the use cases where Node-RED is still used today

are IoT data processing. Node-RED passes the data acquired from sensors for each

process we want to do and publishes it.

Preface ix

Chapter 11, Visualize Data by Creating a Server-Side Application in the IBM Cloud, teaches

us about application development methods for IoT data processing using Node-RED on

the cloud platform side. We usually use the data from edge devices on any cloud platform

for analyzing, visualization, and so on. Node-RED handles the data subscribed from the

MQTT broker and visualizes it for any purpose.

Chapter 12, Developing a Chatbot Application Using Slack and IBM Watson, teaches us

how to create a chatbot application. At rst glance, Node-RED and chatbots don't seem to

be related, but many chatbot applications use Node-RED behind the scenes. e reason

is that Node-RED can perform server-side processing on a data-by-data basis like a

workow. Here, we create a chatbot that runs on Slack, which is used worldwide.

Chapter 13, Creating and Publishing Your Own Node on the Node-RED Library, teaches

us how to develop nodes ourselves. For many use cases, we can nd the node for the

processing we need from the Node-RED Library. is is because many nodes are exposed

on the internet thanks to the contributions of many developers. Let's aid a large number

of other Node-RED users by developing our own node and publishing it to the Node-RED

Library.

To get the most out of this book

You will need Node-RED version 1.2 or later, Node.js version 12 or later, npm version 6

or later, and preferably the latest minor version installed on your computer. But this is

the case when running Node-RED in a local environment. In the case of running on IBM

Cloud, which is one of the tutorials in this book, it depends on the environment of the

cloud platform. All code examples have been tested on macOS, Windows, and Raspberry

Pi OS, but some chapters have command-line instructions based on macOS.

If you are using the digital version of this book, we advise you to type the code yourself

or access the code via the GitHub repository (link available in the next section). Doing

so will help you avoid any potential errors related to the copying and pasting of code.

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