Determine the Encoding of a HTML Byte Stream

This package implements the HTML Standard's encoding sniffing algorithm in all its glory. The most interesting part of this is how it pre-scans the first 1024 bytes in order to search for certain -related patterns.

``js
const htmlEncodingSniffer = require("html-encoding-sniffer");
const fs = require("fs");

const htmlBuffer = fs.readFileSync("./html-page.html");
const sniffedEncoding = htmlEncodingSniffer(htmlBuffer);
`

The returned value will be a canonical encoding name (not a label). You might then combine this with the whatwg-encoding package to decode the result:

`js
const whatwgEncoding = require("whatwg-encoding");
const htmlString = whatwgEncoding.decode(htmlBuffer, sniffedEncoding);
`

Options

You can pass two potential options to htmlEncodingSniffer:

`js
const sniffedEncoding = htmlEncodingSniffer(htmlBuffer, {
transportLayerEncodingLabel,
defaultEncoding
});
`

These represent two possible inputs into the encoding sniffing algorithm:

- transportLayerEncodingLabel is an encoding label that is obtained from the "transport layer" (probably a HTTP Content-Type header), which overrides everything but a BOM.
- defaultEncoding is the ultimate fallback encoding used if no valid encoding is supplied by the transport layer, and no encoding is sniffed from the bytes. It defaults to "windows-1252", as recommended by the algorithm's table of suggested defaults for "All other locales" (including the en` locale).

Credits

This package was originally based on the excellent work of @nicolashenry, in jsdom. It has since been pulled out into this separate package.