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get-file-type-es5

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  • License MIT

Detect the file type of a Buffer/Uint8Array in ES5 (can be used for browser and create-react-app

Package Exports

  • get-file-type-es5

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (get-file-type-es5) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

Detect the file type of a Buffer/Uint8Array

The file type is detected by checking the magic number of the buffer.

This repository is a fork of sindresorhus/file-type that includes an ES5 build for the browser.

Install

$ npm install get-file-type-es5

Show your support for this module by buying this excellent Node.js course.

Usage

Node.js
const readChunk = require('read-chunk');
const fileType = require('file-type');
const buffer = readChunk.sync('unicorn.png', 0, 4100);

fileType(buffer);
//=> {ext: 'png', mime: 'image/png'}

Or from a remote location:

const http = require('http');
const fileType = require('file-type');
const url = 'http://assets-cdn.github.com/images/spinners/octocat-spinner-32.gif';

http.get(url, res => {
    res.once('data', chunk => {
        res.destroy();
        console.log(fileType(chunk));
        //=> {ext: 'gif', mime: 'image/gif'}
    });
});
Browser
const xhr = new XMLHttpRequest();
xhr.open('GET', 'unicorn.png');
xhr.responseType = 'arraybuffer';

xhr.onload = () => {
    fileType(new Uint8Array(this.response));
    //=> {ext: 'png', mime: 'image/png'}
};

xhr.send();

API

fileType(input)

Returns an Object with:

Or null when no match.

input

Type: Buffer Uint8Array

It only needs the first 4100 bytes.

Supported file types

SVG isn't included as it requires the whole file to be read, but you can get it here.

Pull request welcome for additional commonly used file types.

Created by

License

MIT