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Summary
Name	JavaScript file
Version
Other names
Identifiers	MIME: application/javascript PUID: x-fmt/423
Family
Classification
Disclosure
Description	A Javascript file (JS) is writen in the Javascript language and is a source code file that is commonly run on the web (client-side) to deliver processed and dynamic content to users on the web. Variants of Javascript can increasingly be run on the server to provide different capabilities and other performance benefits. Javascript itself is based on the standard ECMAScript (which at time of writing is on its 14th edition: https://ecma-international.org/publications-and-standards/standards/ecma-262/). Developers will often adopt libraries or frameworks to ease the burden of writing commonly needed components and features of Javascript based scripting; such libraries and frameworks include jQuery, React, Typescript, and NodeJS. Understanding tne technical layers of an implementation featuring Javascript will often be important to understanding how to run the complex objects that the scripts form a part of
Orientation	Text
Byte order
Related file formats	None.
Technical Environment
Released
Supported until
Format Risk
Developed by	None.
Supported by	None.
Source	Digital Preservation Department / The National Archives
Source date	02 Feb 2007
Source description	04/2024 (v.118): Description and links added as part of PRONOM Research Week 2024. Submitted by Ross Spencer.
Last updated	17 Apr 2024
Note