Node.js Stream based WebP Container Parser.

node-webpinfo Example	webpinfo (libwebp)

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$ npm install webpinfo

• Simple File Format (Lossy)
• Simple File Format (Lossless)
• Extended File Format (e.g. Animated WebP)

• VP8
• VP8L
• VP8X
• ANIM
• ANMF
• ALPH
• ICCP
• EXIF
• XMP

import { WebPInfo } from "webpinfo";
// local file path
const info = await WebPInfo.from("/some/local/file/path.webp");
// url
const info = await WebPInfo.from("https://example.com/some/file/path.webp");
// buffer
const info = await WebPInfo.from(buf);
// readable stream
const info = await WebPInfo.from(fs.createReadStream(path));
console.log("INFO: ", info);

import * as http from "http";
import { WebPInfo } from "webpinfo";
http.get("https://www.gstatic.com/webp/gallery/1.webp", (res) => {
  if (res.statusCode !== 200) {
    console.log("unexpected status code: ", res.statusCode);
    return;
  }
  res.pipe(new WebPInfo())
    .on("error", (e) => console.log("error", e))
    .on("riff", (riff) => console.log("riff", riff))
    .on("chunk", (chunk) => console.log("chunk", chunk))
    .on("format", (format) => console.log("format", format));
});

Basically WebPInfo is WritableStream.

Parse WebPInfo from given input. Input can be local file path, url, Buffer, or Readable Stream.

Return true if given input contains any animation frame.

Return true if given buffer contains VP8L chunk.

• Event Payload: RIFFContainer

emitted after parsing riff header.

• Event Payload: WebPChunk

emitted after parsing WebP chunk

• Event Payload: WebP

emitted after all WebP chunks have parsed

• mooyoul/is-webp-extended - Extended version of is-webp package which supports Animated WebP. Compatible with Browser environment (e.g. File, ArrayBuffer)

See CHANGELOG.

Set DEBUG environment variable to webpinfo. You will be able to see debug messages on your console.

$ env DEBUG='webpinfo' node your-app.js

$ npm run test

... OR

$ npm run lint # Check lint
$ npm run coverage # Run test & generate code coverage report

$ npm run build

MIT

See full license on mooyoul.mit-license.org