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

Importing and exporting a flow definition

In this section, you will import and export the flow definition you have created. Usually, when developing, it is necessary to back up the source code and version control. You may also import source code created by others, or export your own source code and pass it on to others. Node-RED has a similar concept. In Node-RED, it is a normal practice to import and export the flow itself instead of importing or exporting the source code (for example, the template node described previously).

So, first, let's export the flow we have created so far. This is easy to do:

  1. Simply select Export from the Edit dialog under the Main menu of the Node-RED Flow Editor.

    When the Export menu is displayed, you can only select the current flow or all your flows. You can also select raw JSON, without indentation, or formatted JSON, with indentation.

  2. Here, select the current flow and select Formatted.
  3. Now, you can select how to save the exported...