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exif-rotate-js ・ CircleCI

When you use input file, you can get base64 string as array without worrying about orientation of exif.

Usage

$ npm install exif-rotate-js

API

const data = await getBase64Strings(files, {maxSize, type, quality}))

Return Values

  • a promise returning array string as base64 like ["data:image/jpeg;base64,/9j/4AAQS..."]

Parameters

  • files: input target files. User can select multiple files.
  • maxSize = 720: canvas max size. When image's width is greater than height, maxSize applies to width. And vice versa.
  • type = 'image/jpeg': the mime type of the generated image. Any mime type supported by HTMLCanvasElement.toDataURL() is supported.
  • quality (optional): a number between 0 and 1 indicating the image quality to use for image formats that use lossy compression such as image/jpeg and image/webp. If this argument is anything else, the default value for image quality is used. As per the spec, the default (undefined) value will use 0.92.

Example

import { getBase64Strings } from 'exif-rotate-js';

const elem = document.getElementById('fileImage');

if (elem) {
  elem.onchange = async (e) => {
    if (!e.target) return;
    const data = await getBase64Strings(e.target.files, { maxSize: 1024 });
    console.log(data); // ["data:image/jpeg;base64,/9j/4AAQS..."] as type of Array
  };
}