Os-encoding NPM

os-encoding

A cross-platform Node.js library to get the system's default character encoding.

Supports Windows, macOS, and Linux.

Installation

npm install os-encoding

Usage

const osEncoding = require('os-encoding');

// Get the system's default character encoding
console.log(osEncoding());
// Outputs: 'UTF-8', 'GBK', 'Windows-1252', etc.

console.log(`System encoding: ${osEncoding()}`);
// Output on Chinese Windows: "System encoding: GBK"
// Output on macOS/Linux: "System encoding: UTF-8"

API

`osEncoding([envOnly]): string`

Detects the system's default character encoding.

Returns the encoding name directly as reported by the OS or environment.

Parameters

Parameter	Type	Default	Description
`envOnly`	`boolean`	`false`	If `true`, only checks environment variables (`LANG`/`LC_ALL`) and skips executing fallback commands like `locale` or `chcp`.

Returns

Type: string
Description:
- Raw encoding name (e.g., UTF-8, Shift_JIS, GBK).
- Fallback: Returns UTF-8 if detection fails.

Platform-Specific Behavior

Platform	`envOnly: true` Behavior	`envOnly: false` (Default) Behavior
Windows	Ignores `chcp` command. Returns `UTF-8` if no env vars.	Uses `chcp` when env vars are missing.
macOS	Ignores `locale` command. Returns `UTF-8` if no env vars.	Uses `locale` when env vars are missing.
Linux	Same as macOS.	Same as macOS.

Notes

Original Casing: Encoding names retain their OS-defined format:
- UTF-8 (uppercase with hyphen)
- Shift_JIS (underscore)
- Windows-1252 (platform-specific casing)
Detection Priority:
1. Uses LANG or LC_ALL environment variables (macOS/Linux).
2. Falls back to locale command or Windows chcp if environment variables are missing.

License

os encoding charset locale cross-platform

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