Mdn node js escape() static method escapes any potential regex syntax characters in a string, and returns a new string that can be safely used as a literal pattern for the RegExp() constructor. x 16. We'll outline the main features, and show you some of the main building blocks of an Express application (although at this point you won't yet Express is a fast, unopinionated, minimalist web framework for Node. The current state of Node. Apr 3, 2025 · The Streams API allows JavaScript to programmatically access streams of data received over the network and process them as desired by the developer. The JSON. Jul 8, 2025 · The escape() function computes a new string in which certain characters have been replaced by hexadecimal escape sequences. Compared to encodeURIComponent(), this function encodes fewer characters, preserving those that are part of the URI syntax. 1 Other versions LTS LTS LTS Options View on single page View as JSON Table of contents About this documentation Contributing Stability index Stability overview JSON output System calls and man pages Usage and example Usage Example Assert Strict assertion mode Legacy assertion mode Class: assert. Jul 10, 2025 · The String object is used to represent and manipulate a sequence of characters. Jul 10, 2025 · The filter() method of Array instances creates a shallow copy of a portion of a given array, filtered down to just the elements from the given array that pass the test implemented by the provided function. js/JavaScript) Next Now that you know what Express is for, we'll show you how to set up and test a Node/Express development environment on Windows, or Linux (Ubuntu), or macOS. Nov 5, 2025 · The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. x 13. The privacy encapsulation of these class elements is enforced by JavaScript itself. Jul 8, 2025 · Functions are one of the fundamental building blocks in JavaScript. JavaScript source text is just a sequence of characters — in order for the interpreter to understand it, the string has to be parsed to a more structured representation. Jul 8, 2025 · The class declaration creates a binding of a new class to a given name. It is an AudioNode that passes the audio stream unchanged from the input to the output, but allows you to take the generated data, process it, and create audio visualizations. Jul 29, 2025 · This chapter documents all of JavaScript's standard, built-in objects, including their methods and properties. Jul 10, 2025 · The Date. Sep 18, 2025 · The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value. , objects that represent elements) in a Document inherit. For JSON modules, you can parse the source code using JSON. As an abstract class, there is no such thing as a plain Node object. x 24. Jul 10, 2025 · The RegExp. Jul 8, 2025 · Classes are a template for creating objects. It distinguishes different kinds of nodes from each other, such as elements, text, and comments. Jun 3, 2025 · Creates a new Text node. For detailed information of regular expression syntax, read the regular expression reference. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as Node. Apr 27, 2025 · A template is a text file defining the structure or layout of an output file, with placeholders used to represent where data will be inserted when the template is rendered (in Express, templates are referred to as views). If no values satisfy the testing function, undefined is returned. Aug 18, 2025 · Getting started with React Previous Overview: JavaScript frameworks and libraries Next In this article we will say hello to React. Jul 19, 2025 · And, likewise, Node. As you write JavaScript code, you'll refer to these pages often (thus the title "JavaScript reference"). Jul 8, 2025 · This chapter documents all the JavaScript language operators, expressions and keywords. Our mission is to provide developers with the information they need to easily build projects on the web platform. x 20. parse(). The Error object can also be used as a base object for user-defined exceptions. Nov 7, 2025 · The JavaScript Guide shows you how to use JavaScript and gives an overview of the language. CORS also relies on a mechanism by which browsers make a "preflight" request to the server hosting the cross-origin resource, in order to check that the server will permit the Jul 29, 2025 · The export declaration is used to export values from a JavaScript module. Each piece of JavaScript code is associated with a realm when it's loaded, which remains the same even when called from another realm. Child nodes include elements, text and comments. Module to evaluate it in Node. Fetch is the modern replacement for XMLHttpRequest: unlike XMLHttpRequest, which uses callbacks, Fetch is promise-based and is integrated with features of the modern web such as service workers and Cross-Origin Resource Sharing (CORS). Jul 29, 2025 · The open Web presents incredible opportunities for developers. js: Web application framework for Node. Jul 8, 2025 · The globalThis global property contains the global this value, which is usually akin to the global object. The entire language is described here in detail. The value of an imported binding is subject to change in the module that exports it — when a module updates the value of a binding that it exports, the update will be visible in its imported value. Jul 10, 2025 · The substring() method of String values returns the part of this string from the start index up to and excluding the end index, or to the end of the string if no end index is supplied. Jul 10, 2025 · The includes() method of String values performs a case-sensitive search to determine whether a given string may be found within this string, returning true or false as appropriate. These patterns are used with the exec() and test() methods of RegExp, and with the match(), matchAll(), replace(), replaceAll(), search(), and split() methods of String. x 15. It is designed as a full replacement for the Date object. The original string is left unchanged. The worker thread can perform tasks without interfering with the user interface. It is typically used with boolean (logical) values. js, providing a robust set of features for web and mobile applications. This means it can represent fractional values, but there are some limits to the stored number's magnitude and precision. Nov 7, 2025 · The Blob interface represents a blob, which is a file-like object of immutable, raw data; they can be read as text or binary data, or converted into a ReadableStream so its methods can be used for processing the data. This method does not change the existing arrays, but instead returns a new array. Jun 3, 2025 · Express Tutorial: The Local Library website Previous Overview: Express web framework (Node. The diagram below illustrates the execution model of agents: Realms Each agent owns one or more realms. Oct 27, 2025 · Node. ShellJS - Portable Unix shell commands for Node. Sep 19, 2025 · The Request interface of the Fetch API represents a resource request. Private elements get created by using a hash # prefix and cannot be legally referenced outside of the class. Jul 8, 2025 · The logical AND assignment (&&=) operator only evaluates the right operand and assigns to the left if the left operand is truthy. If the property's value is an object and there are no more references to the object, the object held by that property is eventually released automatically. Node. Mar 20, 2025 · Traditionally, a web page has to send a request to the server to receive new data; that is, the page requests data from the server. For CSS modules, you can create a new CSSStyleSheet object and use its replace() method to populate it with the source code. 12. Strings are inserted as equivalent Text nodes. js, a similar concept called worker threads is available. Jul 10, 2025 · The trim() method of String values removes whitespace from both ends of this string and returns a new string, without modifying the original string. Aug 10, 2025 · NodeList objects are collections of nodes, usually returned by properties such as Node. Jul 8, 2025 · The strict equality (===) operator checks whether its two operands are equal, returning a Boolean result. js is a free, open source tool that lets you run JavaScript outside the web browser. Jul 10, 2025 · The Reflect namespace object contains static methods for invoking interceptable JavaScript object internal methods. The pattern can be a string or a RegExp, and the replacement can be a string or a function called for each match. Feb 19, 2023 · The Text interface represents a text node in a DOM tree. Jul 8, 2025 · The logical AND (&&) (logical conjunction) operator for a set of boolean operands will be true if and only if all the operands are true. Jun 23, 2017 · What are Express and Node? Node (or more formally Node. Sep 20, 2024 · The Element. append() method inserts a set of Node objects or strings after the last child of the Element. The default clause of a switch statement will be jumped to if no case matches the expression's value. Unlike the equality operator, the strict equality operator always considers operands of different types to be different. e. Jul 20, 2025 · The startsWith() method of String values determines whether this string begins with the characters of a specified string, returning true or false as appropriate. It provides a brief overview of each Sep 11, 2025 · Web Workers are a simple means for web content to run scripts in background threads. Sep 9, 2025 · WebSocket-Node: A WebSocket server API implementation for Node. For more information see the associated MDN tutorial home page Cross-Origin Resource Sharing (CORS) is an HTTP-header based mechanism that allows a server to indicate any origins (domain, scheme, or port) other than its own from which a browser should permit loading resources. This resource provides a structured set of tutorials teaching the essential skills and practices for being a successful front-end developer, along with challenges and further recommended resources. js/JavaScript) Next In this first Express article we answer the questions "What is Node?" and "What is Express?", and give you an overview of what makes the Express web framework special. send() or navigator. Jul 19, 2024 · The normalize() method of the Node interface puts the specified node and all of its sub-tree into a normalized form. . The await keyword is permitted within the function body, enabling asynchronous, promise-based behavior to be written in a cleaner style and avoiding the need to explicitly configure promise chains. You'll find out what the tutorial covers, how to get started, how to ask for help, and everything else you need to build and deploy Oct 5, 2025 · Node. x 6. Jul 15, 2025 · A Promise is an object representing the eventual completion or failure of an asynchronous operation. They encapsulate data with code to work on that data. It allows access to a cryptographically strong random number generator and to cryptographic primitives. When it is, it returns a Boolean value. Sep 11, 2025 · Express/Node introduction Overview: Express web framework (Node. A cookie (also known as a web cookie or browser cookie) is a small piece of data a server sends to a user's web browser. Jul 17, 2025 · The delete operator removes a property from an object. js server without a framework This article shows a static file server built in Node. x 5. With server-sent events, it's possible for a server to send new data to a web page at any time, by pushing messages to the web page. Any value (both objects and primitive values) may be used as either a key or a value. js - Node. The methods are the same as those of proxy handlers. Jul 29, 2025 · This page describes JavaScript's lexical grammar. x 0. If any statement within the try block (or in a function called from within the try block) throws an exception, control is immediately shifted to the catch block. In a normalized sub-tree, no text nodes in the sub-tree are empty and there are no adjacent text nodes. Jul 10, 2025 · The Math. Its parameter controls if the subtree contained in a node is also cloned or not. x 8. Oct 2, 2025 · JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. Total. Nov 7, 2025 · The read-only childNodes property of the Node interface returns a live NodeList of child nodes of the given element where the first child node is assigned index 0. JavaScript is a prototype-based, garbage-collected, dynamic language, supporting multiple paradigms such as Jun 3, 2025 · The Element. The resources below describe how the site works, how we write documentation, the guidelines and conventions we follow, and how you can get involved. The default sort order is ascending, built upon converting the elements into strings, then comparing their sequences of UTF-16 code unit values. Classes in JS are built on prototypes but also have some syntax and semantics that are unique to classes. It uses the same format a form would use if the encoding type were set to "multipart/form-data". Oct 9, 2025 · The Web Authentication API (WebAuthn) is an extension of the Credential Management API that enables strong authentication with public key cryptography, enabling passwordless authentication and secure multi-factor authentication (MFA) without SMS texts. timeOrigin (the time when navigation has started in window contexts, or the time when the worker is run in Worker and ServiceWorker contexts). x 17. The imported bindings are called live bindings because they are updated by the module that exported the binding, but cannot be re-assigned by the importing module. Jul 24, 2024 · The FormData interface provides a way to construct a set of key/value pairs representing form fields and their values, which can be sent using the fetch(), XMLHttpRequest. Jul 22, 2025 · The replaceAll() method of String values returns a new string with all matches of a pattern replaced by a replacement. Apr 9, 2025 · The Fetch API provides an interface for fetching resources (including across the network). It can also be used in classes. Jul 18, 2025 · Express is a popular unopinionated web framework, written in JavaScript and hosted within the Node. A realm consists of the following Oct 8, 2024 · The AnalyserNode interface represents a node able to provide real-time frequency and time-domain analysis information. Jul 8, 2025 · A catch block contains statements that specify what to do if an exception is thrown in the try block. More specific classes inherit from Element. Nov 7, 2025 · Element is the most general base class from which all element objects (i. Tutorial "Local Library" website written in in Node/Express. Oct 17, 2025 · The Map object holds key-value pairs and remembers the original insertion order of the keys. To be more specific, attributes is a key/value pair of strings that represents any information regarding that attribute. Aug 19, 2025 · The appendChild() method of the Node interface adds a node to the end of the list of children of a specified parent node. Below you'll find links to our Web technology documentation. To take full advantage of these technologies, you need to know how to use them. It is a NamedNodeMap, not an Array, so it has no Array methods and the Attr nodes' indexes may differ among browsers. Jul 10, 2025 · The Function object provides methods for functions. Feb 26, 2025 · The URLSearchParams interface defines utility methods to work with the query string of a URL. The pattern can be a string or a RegExp, and the replacement can be a string or a function to be called for each match. js 実行環境内でホストされている、人気の指図しないウェブフレームワークです。このモジュールでは、このフレームワークの主な利点、開発環境の設定方法、一般的なウェブ開発と配置作業の実行方法について説明します。 Oct 26, 2025 · The read-only nodeType property of a Node interface is an integer that identifies what the node is. Browser-based JavaScript shells The following JavaScript shells run code through the browser's JavaScript engine. If pattern is a string, only the first occurrence will be replaced. childNodes and methods such as document. attributes property returns a live collection of all attribute nodes registered to the specified node. Sep 25, 2024 · The WebSocket object provides the API for creating and managing a WebSocket connection to a server, as well as for sending and receiving data on the connection. Jul 8, 2025 · Programming languages all have built-in data structures, but these often differ from one language to another. MDN Web Docs is an open-source, collaborative project that documents web platform technologies, including CSS, HTML, JavaScript, and Web APIs. The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps. On completion we'll have a modular structure for our route handling code, which we can extend with real Oct 17, 2025 · The Object type represents one of JavaScript's data types. Nov 2, 2025 · The static import declaration is used to import read-only live bindings which are exported by another module. We also provide extensive 🧑‍🎓 learning resources for beginning developers and students. js is a platform for easily building fast, scalable network applications. The performance. Aug 20, 2025 · Using the Fetch API The Fetch API provides a JavaScript interface for making HTTP requests and processing the responses. See below for standard built-in Jul 29, 2025 · The JavaScript reference serves as a repository of facts about the JavaScript language. x 9. Jul 10, 2025 · The split() method of String values takes a pattern and divides this string into an ordered list of substrings by searching for the pattern, puts these substrings into an array, and returns the array. In JavaScript, every function is actually a Function object. Oct 9, 2025 · Express Tutorial Part 2: Creating a skeleton website Previous Overview: Express web framework (Node. This module explains some of the key benefits of the framework, how to set up your development environment and how to perform common web development and deployment tasks. Nov 3, 2025 · For JavaScript modules, you can dynamically import the source code as a blob: URL in browsers, or use vm. x 7. Jul 8, 2025 · Private elements are counterparts of the regular class elements which are public, including class fields, class methods, etc. Cookies enable web applications to store limited amounts of data and remember state information; by default the HTTP protocol is stateless. js, Apache CouchDB and Adobe Acrobat. We'll discover a little bit of detail about its background and use cases, set up a basic React toolchain on our local computer, and create and play with a simple starter app — learning a bit about how React works in the process. If the array has only one item, then that item will be returned without using the separator. This web application creates an online catalog for a small local library, where users can browse available books and manage their accounts. Exported values can then be imported into other programs with the import declaration or dynamic import. The Fetch API offers a concrete instance of a ReadableStream through the body property of a Response object. running directly on a computer or server OS). js runtime environment. Oct 1, 2025 · The Set object lets you store unique values of any type, whether primitive values or object references. Jul 10, 2025 · Error objects are thrown when runtime errors occur. Jul 5, 2024 · The read-only parentNode property of the Node interface returns the parent of the specified node in the DOM tree. To use a function, you must define it Jul 18, 2025 · Express Tutorial Part 4: Routes and controllers Previous Overview: Express web framework (Node. now() static method returns the number of milliseconds elapsed since the epoch, which is defined as the midnight at the beginning of January 1, 1970, UTC. x 12. However, the || operator actually returns the value of one of the specified operands, so if this operator is used with non-Boolean values, it will return a non-Boolean value. Jun 24, 2025 · The contains() method of the Node interface returns a boolean value indicating whether a node is a descendant of a given node, that is the node itself, one of its direct children (childNodes), one of the children's direct children, and so on. Feb 6, 2025 · MDN Web Docs is a free-to-use resource that documents open web technologies. x LTS 19. The runtime is intended for use outside of a browser context (i. JavaScript is a prototype-based, garbage-collected, dynamic language, supporting multiple paradigms such as Oct 27, 2025 · Express Tutorial Part 7: Deploying to production Previous Overview: Express web framework (Node. replaceWith() method replaces this Element in the children list of its parent with a set of Node objects or strings. All objects that implement Node functionality are based on one of its subclasses. js has had this ability for a long time, and there are a number of JavaScript libraries and frameworks that enable module usage (for example, other CommonJS and AMD -based module systems like RequireJS, webpack, and Babel). x 18. Jul 10, 2025 · The replace() method of String values returns a new string with one, some, or all matches of a pattern replaced by a replacement. Date objects encapsulate an integral number that represents milliseconds since the midnight at the beginning of January 1, 1970, UTC (the epoch). js, you can build fast and scalable applications like web servers, APIs, tools, and more. With the Fetch API, you make a request Sep 28, 2025 · The Array object, as with arrays in other programming languages, enables storing a collection of multiple items under a single variable name, and has members for performing common array operations. This article attempts to list the built-in data structures available in JavaScript and what properties they have. This chapter describes JavaScript regular expressions. For an introduction to regular expressions, read the Regular expressions chapter in the JavaScript guide. random() static method returns a floating-point, pseudo-random number that's greater than or equal to 0 and less than 1, with approximately uniform distribution over that range — which you can then scale to your desired range. Jul 20, 2025 · The sort() method of Array instances sorts the elements of an array in place and returns the reference to the same array, now sorted. It is a more powerful and flexible replacement for XMLHttpRequest. now() method returns a high resolution timestamp in milliseconds. x Options View on single page View as JSON Edit on GitHub About this documentation Usage and example Assertion testing Asynchronous context tracking Async hooks Buffer C++ addons C/C++ addons with Node-API C++ embedder API Child Jul 8, 2025 · The logical OR (||) (logical disjunction) operator for a set of operands is true if and only if one or more of its operands is true. Otherwise it will be false. Sep 8, 2025 · The ReadableStream interface of the Streams API represents a readable stream of byte data. The JavaScript language resembles Java but does not have Java's static typing and strong type checking. stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified. x 10. In addition, they can make network requests using the fetch() or XMLHttpRequest APIs. js v25. Unlike the strict equality operator, it attempts to convert and compare operands that are of different types. The browser may store cookies, create new cookies, modify existing ones, and send them back to the same server with later requests. Nov 7, 2025 · The Document interface represents any web page loaded in the browser and serves as an entry point into the web page's content, which is the DOM tree. Once created, a worker can send messages to the JavaScript code that created it by posting messages to an event handler specified by that code Jul 8, 2025 · The equality (==) operator checks whether its two operands are equal, returning a Boolean result. 1 Other versions 25. x LTS 23. It represents the time elapsed since Performance. These can be used to build other data structures. x 11. Jul 10, 2025 · Boolean values can be one of two values: true or false, representing the truth value of a logical proposition. Jul 21, 2025 · Regular expressions are patterns used to match character combinations in strings. This method can be used to escape HTML characters. x 4. It is used to store various keyed collections and more complex entities. Jul 12, 2024 · The Element. Jul 8, 2025 · The return statement ends function execution and specifies a value to be returned to the function caller. Objects can be created using the Object() constructor or the object initializer / literal syntax. sendBeacon() methods. Jul 10, 2025 · The union() method of Set instances takes a set and returns a new set containing elements which are in either or both of this set and the given set. Sep 14, 2025 · Setting up a Node development environment Previous Overview: Express web framework (Node. x 14. js/JavaScript) Now that you've created and tested a sample website using Express, it's time to deploy it to a web server so people can access it over the public internet. js® is a free, open-source, cross-platform JavaScript runtime environment that lets developers create servers, web apps, command line tools and scripts. Firefox has a built-in JavaScript console, which support multi-line editing. js/JavaScript) Next This second article in our Express Tutorial shows how you can create a "skeleton" website project which you can then go on to populate with site-specific routes, templates/views, and database calls. Oct 16, 2025 · The Crypto interface represents basic cryptography features available in the current context. The only way to access a private element is via dot notation, and you can Jul 10, 2025 · The concat() method of Array instances is used to merge two or more arrays. Oct 28, 2025 · The textContent property of the Node interface represents the text content of the node and its descendants. Express は、JavaScript で書かれ、Node. js without using any frameworks. js/JavaScript) Next This article is an overview of the MDN Express tutorial and introduces the "local library" example website we'll be using throughout the next few pages. If you need exhaustive information about a language feature, have a look at the JavaScript reference. The implementation selects the initial seed to the random number generation algorithm; it cannot be chosen or reset by the user. This page explains how to host an Express project and outlines what you need to get it ready for production. js/JavaScript) Next In this tutorial we'll set up routes (URL handling code) with "dummy" handler functions for all the resource endpoints that we'll eventually need in the LocalLibrary website. Jul 8, 2025 · The async function declaration creates a binding of a new async function to a given name. These incoming messages can be treated as Events + data inside the web page. The initial step of parsing is called lexical analysis, in which the text gets scanned from left to right and is converted into a sequence of individual, atomic input Nov 9, 2025 · The RegExp object is used for matching text with a pattern. Jul 20, 2025 · The structuredClone() method of the Window interface creates a deep clone of a given value using the structured clone algorithm. A function in JavaScript is similar to a procedure—a set of statements that performs a task or calculates a value, but for a procedure to qualify as a function, it should take some input and return an output where there is some obvious relationship between the input and the output. querySelectorAll(). Oct 29, 2025 · Welcome to MDN Learning Web Development (also known as Learn). Jul 8, 2025 · The encodeURI() function encodes a URI by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the character (will only be four escape sequences for characters composed of two surrogate characters). AssertionError Aug 18, 2025 · The DOM Node interface is an abstract base class upon which many other DOM API objects are based, thus letting those object types be used similarly and often interchangeably. Jul 20, 2025 · The forEach() method of Array instances executes a provided function once for each array element. js) is an open-source, cross-platform, runtime environment that allows developers to create all kinds of server-side tools and applications in JavaScript. Jul 10, 2025 · The length data property of a String value contains the length of the string in UTF-16 code units. Jul 4, 2025 · The console. Most notable are Document, Element, and DocumentFragment. 2. Very briefly, an IEEE 754 double-precision number uses 64 bits to represent 3 parts: 1 bit for the sign (positive or negative) 11 bits for the Nov 3, 2025 · Loops offer a quick and easy way to do something repeatedly. The finally block will always execute before control flow Oct 2, 2025 · JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. JavaScript Date objects represent a single moment in time in a platform-independent format. x LTS 21. Aug 14, 2025 · The Temporal object enables date and time management in various scenarios, including built-in time zone and calendar representation, wall-clock time conversions, arithmetics, formatting, and more. This chapter of the JavaScript Guide introduces the different iteration statements available to JavaScript. It only has methods and properties common to all kinds of elements. 10. Jul 10, 2025 · The cause data property of an Error instance indicates the specific original cause of the error. Nov 3, 2025 · Node. x 22. The JSON namespace object contains static methods for parsing values from and converting values to JavaScript Object Notation (JSON). js (Example: WebSocket chat) SignalR: SignalR will use WebSockets under the covers when it's available, and gracefully fallback to other techniques and technologies when it isn't, while your application code stays the same. js. In JavaScript, regular expressions are also objects. Nov 12, 2025 · Template literals are literals delimited with backtick (`) characters, allowing for multi-line strings, string interpolation with embedded expressions, and special constructs called tagged templates. Nov 7, 2025 · In Node. Number encoding The JavaScript Number type is a double-precision 64-bit binary format IEEE 754 value, like double in Java or C#. Jul 10, 2025 · The join() method of Array instances creates and returns a new string by concatenating all of the elements in this array, separated by commas or a specified separator string. Nov 3, 2025 · The cloneNode() method of the Node interface returns a duplicate of the node on which this method was called. Since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them. With Node. Jul 20, 2025 · The map() method of Array instances creates a new array populated with the results of calling a provided function on every element in the calling array. Oct 31, 2025 · The get syntax binds an object property to a function that will be called when that property is looked up. Jul 20, 2025 · The find() method of Array instances returns the first element in the provided array that satisfies the provided testing function. Aug 26, 2025 · The nullish coalescing (??) operator is a logical operator that returns its right-hand side operand when its left-hand side operand is null or undefined, and otherwise returns its left-hand side operand. Jul 8, 2025 · The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems). If no exception is thrown in the try block, the catch block is skipped. table() static method displays tabular data as a table. js is such that almost everything we need for the static file server is provided by built-in APIs and a few lines of code. js JavaScript on the server can respond to custom requests sent by code executed in the browser. JavaScript and Java JavaScript and Java are similar in some ways but fundamentally different in some others. Jul 8, 2025 · The switch statement evaluates an expression, matching the expression's value against a series of case clauses, and executes statements after the first case clause with a matching value, until a break statement is encountered. For any of those operating systems, this article provides what you need to start developing Express apps.