base64-image-mime

Base64-image-mime

A small utility to get mimetype from base64-encoded images

Currently support mime-type:

• image/png
• image/gif
• image/jpeg
• image/svg+xml
• image/webp

Installation

npm install base64-image-mime

// or with yarn

yarn add base64-image-mime

Usage

Can detect both with prefix & without prefix base64 encoded image

const { getImageMime } = require('base64-image-mime')

// below are just a part of base64 image for demo purpose, not a full image

const pngWithPrefix = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAXCAYAAAB9J90oAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAA'
console.log(getImageMime(pngWithPrefix))
// => image/png

const pngWithoutPrefix = 'iVBORw0KGgoAAAANSUhEUgAAACoAAAAXCAYAAAB9J90oAAAAA'
console.log(getImageMime(pngWithoutPrefix))
// => image/png

const jpgWithPrefix = 'data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEAYABgAAD/4QBmRXhpZgAATU0AKgAAAAgABgESAAMAAAABAAEAAAMBAAUAAAABAAAAVgMDAAEAAAABAAAAAFEQAAEAAAABAQAAAF'
console.log(getImageMime(jpgWithPrefix))
// => image/jpeg

const jpgWithoutPrefix = '/9j/4AAQSkZJRgABAQEAYABgAAD/4QBmRXhpZgAATU0AKgAAAAgABgESAAMAAAABAAEAAAMBAAUAAAABAAAAVgMDAAEAAAABAAAAAFEQAAEAAAABAQAAAF'
console.log(getImageMime(jpgWithoutPrefix))
// => image/jpeg

License

MIT © huyennbl

Changelog

[1.0.2]

Fixed

• Fix a regex bug that break safari - Thanks @ajoslin103 for reporting.