Base64-2-img

base64-2-img is a light weight javascript image to base64 string and base64 string to image conversion library for nodejs. This library implements the nodejs core http module to read an image blob into a base64 string.

Contents

• Base64-2-img
  • Contents
  • Getting Started
    • Installation
  • Documentation
    • Library Functions
    • Using the library
  • Contribution
  • Version Management
  • Authors
  • License

Getting Started

This library is available through these javascript node package manager npm and yarn.

Installation

To use this library, first ensure you have a package manager initialized either with npm or yarn

# for npm use:
npm install --save base64-2-img

# for yarn use:
yarn add base64-2-img

To include image-2-base64 in your project. use one of these:

// ES6 and later
import { imageToBase64, base64ToImage } from "base64-2-img";

// or
import * as img2Base64 from "base64-2-img";

However, if you are using ECMAScript 5 and older, use the require statement:

// ES5 and older
var { imageToBase64, base64ToImage } = require("base64-2-img");

// or
var img2Base64 = require("base64-2-img");

Documentation

Img-2-base64 is a simple library with only two exposed functions. This is all intentional mainly to keep everything simple. This is a complete documentation of the library and how to use it in your project. All examples work on both ECMAScript 5 (ES5 and older).

Library Functions

Function	Description	Parameter	Return
imageToBase64	Accepts an image url or disk path return a base64 representation of the image	url - {string}: image uri or disk image file path	base64String - a base64 string
base64ToImage	Accepts a base64 string and an option {object} and creates an image file (blob)	base64String - {string}: a base64 string representation of an image	success or Error - a promise that resolves to success if file was created or throws an error

The base64ToImage(base64String[, option]) function accepts two arguments

• base64String - This is a required filed which is simply an image in base64 representation e.g /9j/4AAQSkZJRgABAQEASA...
• option - This is optional and can be one or all of the following properties
  • filePath {string} - The directory path where the is to be generated defaults to the parent working directory.
  • fileName {string} - The name of the file excluding the extensioin - the extension will be generated based on the base64 header if present or default to the name image.png.
  • randomizeFileName {boolean} - Defaults to false, if set to true this will use a randomized string as the image name e.g xHyu45.jpg.

Using the library

import { imageToBase64, base64ToImage } from "base64-2-img";

// using a remote image url - promises
var url = "http://image-file-path"
imageToBase64(url).then(function(_base64String) {
  console.log(_base64String); // data:image/jpeg;base64,/9j/4AAQSkZJRgABAQEASA...
});

// using a local image file path - async-await
async function main() {
  var url = path.resolve(__dirname, "..", "sampleImage.png");
  var base64String = await imageToBase64(url);

  var outputFilePath = path.resolve(__dirname, "temp");
  base64ToImage(base64String, { filePath: outputFilePath, fileName: 'img' }); // success and create a file at temp/img.png or temp/img.jpg.

  // or
  var message = await base64ToImage(base64String, { filePath: outputFilePath, fileName: 'img' });
  console.log(message); // success
}
...

NOTE: See the example folder for the full working code.

Contribution

To contribute, simply fork this project, and issue a pull request.

Version Management

We use SemVer for version management. For the versions available, see the tags on this repository.

Authors

Chukwuemeka Ajima - ajimae

License

This project is licensed under the MIT License - see the LICENSE file for details