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is-gif

is-gif Build Status

Check if a Buffer/Uint8Array is a GIF image

Used by image-type.

Install

$ npm install --save is-gif

Usage

Node.js
var readChunk = require('read-chunk'); // npm install read-chunk 
var isGif = require('is-gif');
var buffer = readChunk.sync('unicorn.gif', 0, 3);
 
isGif(buffer);
//=> true 
Browser
var xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.gif');
xhr.responseType = 'arraybuffer';
 
xhr.onload = function () {
    isGif(new Uint8Array(this.response));
    //=> true 
};
 
xhr.send();

API

isGif(buffer)

Accepts a Buffer (Node.js) or Uint8Array.

It only needs the first 3 bytes.

License

MIT © Sindre Sorhus