---
title: uibuilder Glossary
description: >
   Terms used in this documentation and their meanings.
created: 2019-05-27 17:13:00
lastUpdated: 2023-04-02 17:34:24
---

| Term         | Meaning                                                      |
| ------------ | ------------------------------------------------------------ |
| `<xxxx>`     | When a word is shown between angle brackets in the uibuilder documentation, it indicates that this is a variable. (unless it is clearly an HTML tag). |
|              |                                                              |
| CSS Selector | The standardised code that allows CSS or JavaScript to identify one or more elements on a web page. See [MDN CSS Selectors](https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Selectors) for details. e.g. the selector for an HTML element with an id of `more` would be `#more`, to select all the elements with a specific class, `.classname`, all list entries `li`. |
| ECMA         | Non-profit standards organisation for information and communications systems. Amongst other things, manages the standards for JavaScript - formally known as *ECMA Script* - in the ECMA-262 standard. |
| element      | Something on a web page. Defined by one or more HTML "tags" such as `<div>...</div>`. |
| ESM          | AKA "ES Module" (ES=ECMA Script, AKA JavaScript). The Modern module form supported by modern browsers as well as Node.JS. Note that Node.JS also supports CommonJS modules, these are not supported by browsers). [Ref.1](https://hacks.mozilla.org/2018/03/es-modules-a-cartoon-deep-dive/), [Ref.2](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules) |
| IIFE         | "Immediately Invoked Function Expression". [Ref.](https://developer.mozilla.org/en-US/docs/Glossary/IIFE)
| instance     | In Node-RED, when a node is added to a flow, it is said that this is an instance of a node. Unlike the Node-RED Dashboard, uibuilder can have many instances, each on a separate root url (*instanceRoot*).<br>In addtion, Node-RED itself can be run multiple times. Each of these is "an instance of Node-RED". |
| instanceRoot | The root folder for a specific uibuilder node instance. It will be at `<uibRoot>/<url>/`. |
| library      | One or more programme files that are utilised by other programs. Often delivered as one or more modules and installed as a _package_. |
| low-code     | The ability to process information with minimal, reduced computer code. |
| module       | A node.js module contains one or more exported objects. These are then `require`d (for old-style CommonJS modules) or `import`ed for ESM style modules. See the Node.js documentation for details. |
| package      | A collection of scripts, configuration and documentation that is normally installed via the`npm` command.<br>A package is defined by a `package.json` file in the root folder. |
| parent       | Indicates a level up in the HTML page's hierarcy. For example, an H1 element would typically have a parent of BODY, a TD a parent of TR.<br />Also indicates a level up in a filing system or URL hierarchy. |
| port         | Indicates the input and output ports of a Node-RED node (wires attach to these).<br />Alternatively, a TCP port. They define a communications channel over a TCP protocol. Most commonly seen in browser URLS. Appearingafter the name/IP-address. For example, Node-RED's default port is 1880 and MQTT's is 1883. |
| root         | Indicates the top level of a defined hierarcy.               |
| uibuilder    | Extension package for Node-RED. node-red-contrib-uibuilder. Also shorthand for the node template and any node instances installed. |
| uibRoot      | The root folder that contains all settings and front-end user code for all instances of uibuilder.<br />Default Location:<br />  If projects not in use: `<userDir>/uibuilder/`<br />  If projects in use: `<userDir>/projects/<projectName>/uibuilder/`<br>However, as of *v4*, the uibRoot folder can now be moved to wherever you want it.<br>As of *v5*, this is also where any front-end library packages are installed. Each installed package is added to the web server so that it can be accessed from your web pages. |
| url          | When used in lower-case, refers to the uibuilder node setting of the same name that defines the URI for the instance.<br />e.g. if url = 'test1' and Node-RED is running on the default port on the local device, the full URL of the default page would be `http://localhost:1880/test1/`<br>When written in upper-case, it refers to the W3C URL, e.g. what you will see in your browser's address bar. |
| UMD          | "Universal Module Definition". [Ref.](https://github.com/umdjs/umd) |
| userDir      | The folder used by Node-RED to store all settings, configuration and flows for a running instance of Node-RED<br />Default location: `<userHome>/.node-red/` |
| userHome     | The operating system folder designated as the "home" folder for the user ID running Node-RED.<br>For Linux, MacOS and in PowerShell on Windows, there is a shortcut for userHome: `~`. |
| vendor       | A 3rd party. In this case, refers to any 3rd-party package installed via `npm`. |
| wire         | In Node-RED, the line that connects nodes together. Indicates the passing of messages from one node to another. |
| zero-code    | The ability to process information without the need to write computer code. |

See also, [MDN Web Docs Glossary: Definitions of Web-related terms](https://developer.mozilla.org/en-US/docs/Glossary)
