Need private packages and team management tools?Check out npm Teams »

html-encoding-sniffer

2.0.1 • Public • Published

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 <meta charset>-related patterns.

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:

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

Options

You can pass two potential options to htmlEncodingSniffer:

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.

Keywords

Install

npm i html-encoding-sniffer

DownloadsWeekly Downloads

6,254,145

Version

2.0.1

License

MIT

Unpacked Size

11.5 kB

Total Files

4

Last publish

Collaborators

  • avatar
  • avatar
  • avatar
  • avatar
  • avatar
  • avatar