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Original author(s) | Isaac Z. Schlueter |
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Developer(s) | npm, Inc. (a subsidiary of GitHub, [1] a subsidiary of Microsoft) |
Initial release | 12 January 2010 [2] |
Stable release | |
Repository | |
Written in | JavaScript |
Platform | Cross-platform |
Type | Package manager |
License | Artistic License 2.0 |
Website | www |
npm is a package manager for the JavaScript programming language maintained by npm, Inc., a subsidiary of GitHub. npm is the default package manager for the JavaScript runtime environment Node.js and is included as a recommended feature in the Node.js installer. [4]
It consists of a command line client, also called npm, and an online database of public and paid-for private packages, called the npm registry. The registry is accessed via the client, and the available packages can be browsed and searched via the npm website. The package manager and the registry are managed by npm, Inc.
Although "npm" is commonly understood to be an abbreviation of "Node Package Manager", it is officially a recursive backronymic abbreviation for "npm is not an acronym". [5]
npm was developed by Isaac Z. Schlueter as a result of having "seen module packaging done terribly" and with inspiration from other similar projects such as PEAR (PHP) and CPAN (Perl). [6] npm is a JavaScript replacement for pm, a shell script. [7]
The company npm, Inc. was founded in 2014 in Oakland, California, United States, with Laurie Voss as co-founder. Bryan Bogensberger joined the company as CEO in July 2018 and resigned in September 2019. [8] Before Bogensberger's resignation, Laurie Voss resigned in July 2019. [9]
In March 2020, npm was acquired by GitHub, which is a subsidiary of Microsoft.
npm can manage packages that are local dependencies of a particular project, as well as globally-installed JavaScript tools. [10] When used as a dependency manager for a local project, npm can install, in one command, all the dependencies of a project through the package.json
file. [11] In the package.json
file, each dependency can specify a range of valid versions using the semantic versioning scheme, allowing developers to auto-update their packages while at the same time avoiding unwanted breaking changes. [12] npm also provides version-bumping tools for developers to tag their packages with a particular version. [13] npm also provides the package-lock.json
[14] file which has the entry of the exact version used by the project after evaluating semantic versioning in package.json
.
npm's command-line interface client allows users to consume and distribute JavaScript modules that are available in the registry. [15]
In February 2018, an issue was discovered in version 5.7.0 in which running sudo npm
on Linux systems would change the ownership of system files, permanently breaking the operating system. [16]
In npm version 6, the audit feature was introduced to help developers identify and fix security vulnerabilities in installed packages. [17] The source of security vulnerabilities were taken from reports found on the Node Security Platform (NSP) and has been integrated with npm since npm's acquisition of NSP. [18]
Packages in the registry are in ECMAScript Module (ESM) or CommonJS format and include a metadata file in JSON format. [19]
Over 3.1 million packages are available in the main npm registry. [20]
The registry does not have any vetting process for submission, which means that packages found there can potentially be low quality, insecure, or malicious. [19] Instead, npm relies on user reports to take down packages if they violate policies by being low quality, insecure, or malicious. [21] npm exposes statistics including number of downloads and number of depending packages to assist developers in judging the quality of packages. [22]
Internally npm relies on the NoSQL Couch DB to manage publicly available data. [23]
In March 2016, a package called left-pad
was unpublished as the result of a naming dispute between Azer Koçulu, an individual software engineer, and Kik. [24] [25] The package was immensely popular on the platform, being depended on by thousands of projects and reaching 15 million downloads prior to its removal. [24] [26] Several projects critical to the JavaScript ecosystem including Babel and Webpack depended on left-pad
and were rendered unusable. [27] Although the package was republished three hours later, [28] it caused widespread disruption, leading npm to change its policies regarding unpublishing to prevent a similar event in the future. [29]
In March 2022, developer Brandon Nozaki Miller, maintainer of the node-ipc
package, added peacenotwar
as a dependency to the package; peacenotwar
recursively overwrites an affected machine's hard drive contents with the heart emoji if they have a Belarusian or Russian IP address. The package also leaves a text file on the machine containing a message in protest of the Russian invasion of Ukraine. Vue.js, which uses node-ipc
as a dependency, did not pin its dependencies to a safe version, meaning that some users of Vue.js became affected by the malicious package if the dependency was fetched as the latest package. [30] [31] The affected dependency was also briefly present in version 3.1 of Unity Hub; a hotfix was released the same day to remove the issue, however. [32]
In November 2018, it was discovered that a malicious package had been added as a dependency to version 3.3.6 of the popular package event-stream
. [33] The malicious package, called flatmap-stream
, contained an encrypted payload that stole bitcoins from certain applications. [34]
In May 2021, pac-resolver
, an npm package that received over 3 million downloads per week, was discovered to have a remote code execution vulnerability. [35] The vulnerability resulted from how the package handled config files, and was fixed in versions 5 and greater. [36]
In January 2022, the maintainer of the popular package colors
pushed changes printing garbage text in an infinite loop. [26] The maintainer also cleared the repository of another popular package, faker
, and its package on npm, and replaced it with a README that read, "What really happened to Aaron Swartz?" [37]
In May 2023, several npm packages including bignum
were found to be exploited, stealing user credentials and information from affected machines. Researchers discovered that these packages had been compromised through an exploit involving Amazon S3 buckets and the node-gyp
command line tool. [38]
There are a number of open-source alternatives to npm for installing modular JavaScript, including pnpm, Yarn, [39] Bun and Deno. Deno and Bun also provide a JavaScript runtime, while only Deno operates independently from npm Registry or any centralized repository [40] and its support of npm registry is still a subject of ongoing work in progress as of January 2024. [41] They are all compatible with the public npm registry and use it by default, but provide different client-side experiences, usually focused on improving performance and determinism compared to the npm client. [42]
The Comprehensive Perl Archive Network (CPAN) is a software repository of over 250,000 software modules and accompanying documentation for 39,000 distributions, written in the Perl programming language by over 12,000 contributors. CPAN can denote either the archive network or the Perl program that acts as an interface to the network and as an automated software installer. Most software on CPAN is free and open source software.
A package manager or package-management system is a collection of software tools that automates the process of installing, upgrading, configuring, and removing computer programs for a computer in a consistent manner.
Svelte is a free and open-source component-based front-end software framework, and language created by Rich Harris and maintained by the Svelte core team members.
Google Closure Tools was a set of tools built with the goal of helping developers optimize rich web applications with JavaScript. It was developed by Google for use in their web applications such as Gmail, Google Docs and Google Maps. As of Aug 1, 2024 the Closure Library has been sunset, for not "meeting the needs of modern JavaScript development".
Node.js is a cross-platform, open-source JavaScript runtime environment that can run on Windows, Linux, Unix, macOS, and more. Node.js runs on the V8 JavaScript engine, and executes JavaScript code outside a web browser.
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and else
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, that resemble a sideways moustache. Mustache is used mainly for mobile and web applications.
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Ember.js is an open-source JavaScript web framework that utilizes a component-service pattern. It is designed to allow developers to create scalable single-page web applications by incorporating common idioms, best practices, and patterns from other single-page-app ecosystem patterns into the framework.
Composer is an application-level dependency manager for the PHP programming language that provides a standard format for managing dependencies of PHP software and required libraries. It was developed by Nils Adermann and Jordi Boggiano, who continue to manage the project. They began development in April 2011 and first released it on March 1, 2012. Composer is strongly inspired by Node.js's "npm" and Ruby's "bundler". The project's dependency solving algorithm started out as a PHP-based port of openSUSE's libzypp SAT solver.
Browserify is an open-source JavaScript bundler tool that allows developers to write and use Node.js-style modules that compile for use in the browser.
Webpack is a free and open-source module bundler for JavaScript. It is made primarily for JavaScript, but it can transform front-end assets such as HTML, CSS, and images if the corresponding loaders are included. Webpack takes modules with dependencies and generates static assets representing those modules.
gulp is an open-source JavaScript toolkit, used as a streaming build system in front-end web development.
Grunt is a JavaScript task runner, a tool used to automatically perform frequent tasks such as minification, compilation, unit testing, and linting. It uses a command-line interface to run custom tasks defined in a file. Grunt was created by Ben Alman and is written in Node.js. It is distributed via npm. As of October 2022, there were more than 6,000 plugins available in the Grunt ecosystem.
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peacenotwar is a piece of malware, which has been characterized as protestware, created by Brandon Nozaki Miller. In March 2022, it was added as a dependency in an update for node-ipc
, a common JavaScript dependency.
On March 22, 2016, software engineer Azer Koçulu took down the left-pad
package that he had published to npm. Koçulu deleted the package after a dispute with Kik Messenger, in which the company forcibly took control of the package name kik
. As a result, thousands of software projects that used left-pad
as a dependency, including the Babel transcompiler and the React web framework, were unable to be built or installed. This caused widespread disruption, as technology corporations small and large, including Facebook, PayPal, Netflix and Spotify, used left-pad
in their software products.