100 lines
1.9 KiB
Markdown
100 lines
1.9 KiB
Markdown
# chardet
|
|
|
|
*Chardet* is a character detection module written in pure Javascript (Typescript). Module uses occurrence analysis to determine the most probable encoding.
|
|
|
|
- Packed size is only **22 KB**
|
|
- Works in all environments: Node / Browser / Native
|
|
- Works on all platforms: Linux / Mac / Windows
|
|
- No dependencies
|
|
- No native code / bindings
|
|
- 100% written in Typescript
|
|
- Extensive code coverage
|
|
|
|
## Installation
|
|
|
|
```
|
|
npm i chardet
|
|
```
|
|
|
|
## Usage
|
|
|
|
To return the encoding with the highest confidence:
|
|
|
|
```javascript
|
|
const chardet = require('chardet');
|
|
|
|
chardet.detect(Buffer.from('hello there!'));
|
|
// or
|
|
chardet.detectFile('/path/to/file').then(encoding => console.log(encoding));
|
|
// or
|
|
chardet.detectFileSync('/path/to/file');
|
|
```
|
|
|
|
To return the full list of possible encodings use `analyse` method.
|
|
|
|
```javascript
|
|
const chardet = require('chardet');
|
|
chardet.analyse(Buffer.from('hello there!'));
|
|
```
|
|
|
|
Returned value is an array of objects sorted by confidence value in decending order
|
|
|
|
```javascript
|
|
[
|
|
{ confidence: 90, name: 'UTF-8' },
|
|
{ confidence: 20, name: 'windows-1252', lang: 'fr' }
|
|
];
|
|
```
|
|
|
|
## Working with large data sets
|
|
|
|
Sometimes, when data set is huge and you want to optimize performace (in tradeoff of less accuracy),
|
|
you can sample only first N bytes of the buffer:
|
|
|
|
```javascript
|
|
chardet
|
|
.detectFile('/path/to/file', { sampleSize: 32 })
|
|
.then(encoding => console.log(encoding));
|
|
```
|
|
|
|
## Supported Encodings:
|
|
|
|
- UTF-8
|
|
- UTF-16 LE
|
|
- UTF-16 BE
|
|
- UTF-32 LE
|
|
- UTF-32 BE
|
|
- ISO-2022-JP
|
|
- ISO-2022-KR
|
|
- ISO-2022-CN
|
|
- Shift_JIS
|
|
- Big5
|
|
- EUC-JP
|
|
- EUC-KR
|
|
- GB18030
|
|
- ISO-8859-1
|
|
- ISO-8859-2
|
|
- ISO-8859-5
|
|
- ISO-8859-6
|
|
- ISO-8859-7
|
|
- ISO-8859-8
|
|
- ISO-8859-9
|
|
- windows-1250
|
|
- windows-1251
|
|
- windows-1252
|
|
- windows-1253
|
|
- windows-1254
|
|
- windows-1255
|
|
- windows-1256
|
|
- KOI8-R
|
|
|
|
Currently only these encodings are supported.
|
|
|
|
## Typescript?
|
|
|
|
Yes. Type definitions are included.
|
|
|
|
### References
|
|
|
|
- ICU project http://site.icu-project.org/
|