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internationalization_support.md

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Node.js has many features that make it easier to write internationalized programs. Some of them are:

  • Locale-sensitive or Unicode-aware functions in the [ECMAScript Language Specification][ECMA-262]:
    • [String.prototype.normalize()][]
    • [String.prototype.toLowerCase()][]
    • [String.prototype.toUpperCase()][]
  • All functionality described in the [ECMAScript Internationalization API Specification][ECMA-402] (aka ECMA-402):
    • [Intl][] object
    • Locale-sensitive methods like [String.prototype.localeCompare()][] and [Date.prototype.toLocaleString()][]
  • The [WHATWG URL parser][]'s [internationalized domain names][] (IDNs) support
  • [require('buffer').transcode()][]
  • More accurate [REPL][] line editing
  • [require('util').TextDecoder][]

Node.js (and its underlying V8 engine) uses [ICU][] to implement these features in native C/C++ code. However, some of them require a very large ICU data file in order to support all locales of the world. Because it is expected that most Node.js users will make use of only a small portion of ICU functionality, only a subset of the full ICU data set is provided by Node.js by default. Several options are provided for customizing and expanding the ICU data set either when building or running Node.js.