computer science

Node-RED

Node-RED is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Node-RED rather than just read about it. In short: Node-RED is a flow-based, low-code development tool for visual programming, originally developed by IBM for wiring together hardware devices, APIs and online services as part of the Internet of things. Node-RED provides a web browser-based flow editor, which can be used to create JavaScript functions.

Node-RED — illustration

Key takeaways

Node-RED belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Node-RED to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Node-RED from memory before moving on to harder problems.

Reference excerpt

Node-RED is a flow-based, low-code development tool for visual programming, originally developed by IBM for wiring together hardware devices, APIs and online services as part of the Internet of things. Node-RED provides a web browser-based flow editor, which can be used to create JavaScript functions. Elements of applications can be saved or shared for re-use. The runtime is built on Node.js. The flows created in Node-RED are stored using JSON. In 2016, IBM contributed Node-RED as an open source JS Foundation project.

Projects The Node-RED project has a number of components:

Node-RED – the visual designer tool accessed through a web browser, usually on port 1880. Node-RED Dashboard – a dashboard user interface for Node-RED. Node generator, a command-line tool to generate Node-RED node modules from several sources, including OpenAPI documents and a function node's source. Node-RED Command Line Tool, a command-line tool that allows for remotely administering a Node-RED instance.

Flows A Node-RED flow describes the connection and sequencing of various input, output, and processing nodes within the Node-RED platform. Each node within a flow performs a unique and specific task. When data is transmitted to a node, the node processes it according to its designated function, before passing it on to the subsequent node in the flow. This system allows for the controlled execution and regulation of a wide range of operations. Node-RED flows represent the primary visual programming mechanism of the tool.

Adoption Node-RED has gained traction in the industrial internet of things (IIoT) and edge computing sectors. Node-RED's open-source nature and large community have led to the creation of over 4000 connectors supporting a wide range of data sources and protocols such as Modbus, OPC-UA, Siemens S7, and MQTT. Several PLC and IoT vendors have adopted Node-RED as a standard.

Community survey The 2023 Node-RED Community Survey provided insights into the usage patterns, preferences, and feedback from 780 individuals who are part of the Node-RED community. The survey, conducted in March 2023, revealed that Node-RED's usage extends beyond DIY home automation, with a trend towards professional use in a variety of industries. Over half of the respondents had been using Node-RED for over two years, indicating a well-established community. The most common messaging technologies used in conjunction with Node-RED are MQTT and HTTP, while InfluxDB emerged as the most popular database within the community. The survey also shed light on perceived barriers to adoption, pointing towards the perception of Node-RED as a proof of concept tool and the lack of certain key features. Despite these challenges, the survey highlighted a high level of satisfaction within the community, with over two-thirds of respondents rating Node-RED a 5 out of 5.

Commercial offerings FlowFuse (formerly known as FlowForge) is an open-core company investing in Node-RED. Nick O’Leary, co-creator of Node-RED, is FlowFuse co-founder and CTO. FlowFuse adds collaborative development, management of remote deployments, support for DevOps delivery pipelines, and the ability to host Node-RED applications on FlowFuse Cloud.

Illustrations

Worked examples

Example 1 — a first encounter with Node-RED

Start with the simplest possible case. Write down what Node-RED claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Node-RED before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Node-RED ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Node-RED

In research: Node-RED appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Node-RED in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Node-RED is common in secondary-school and first-year university syllabi. It links to neighbouring topics IBM software, Internet of things, JSON, so understanding it makes those chapters shorter.
In everyday life: Look for Node-RED outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Node-RED in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Node-RED means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Node-RED out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Node-RED in simple terms?

Why does Node-RED matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Node-RED?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Node-RED.