Package - datauri

Node.js Module and CLI to generate Data URI scheme.

The data URI scheme is a uniform resource identifier (URI) scheme that provides a way to include data in-line in web pages as if they were external resources.

from: Wikipedia

MODULE

npm install datauri

Getting started

By default, datauri module returns a promise, which is resolved with data:uri string or rejected with read file error:

const datauri = require('datauri');

const content = await datauri('test/myfile.png');

console.log(content);
//=> "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA..."

Callback style and meta data

const datauri = require('datauri');

datauri('test/myfile.png', (err, content, meta) => {
  if (err) {
    throw err;
  }

  console.log(content); //=> "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA..."

  console.log(meta.mimetype); //=> "image/png"
  console.log(meta.base64); //=> "iVBORw0KGgoAAAANSUhEUgAA..."
  console.log(meta.buffer); //=> file buffer
});

CSS parser

const datauriCSS = require('datauri/css');

await datauriCSS('test/myfile.png');
//=> "\n.case {\n    background-image: url('data:image/png; base64,iVBORw..."

await datauriCSS('test/myfile.png', {
  className: 'myClass',
  width: true,
  height: true
});
//=> adds image width and height and custom class name

Synchronous calls

const Datauri = require('datauri/sync');
const meta = Datauri('test/myfile.png');

console.log(meta.content); //=> "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA..."
console.log(meta.mimetype); //=> "image/png"
console.log(meta.base64); //=> "iVBORw0KGgoAAAANSUhEUgAA..."
console.log(meta.buffer); //=> file buffer

From a Buffer

If you already have a file Buffer, that's the way to go:

const DatauriParser = require('datauri/parser');
const parser = new DatauriParser();

const buffer = fs.readFileSync('./hello');

parser.format('.png', buffer); //=> "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA..."

From a string

const DatauriParser = require('datauri/parser');
const parser = new DatauriParser();

parser.format('.png', 'xkcd'); //=> "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAA..."

Contribute

$ npm install

To run test specs

$ npm test

ChangeLog

Requirements

Node.js 10+

Previous Node versions and deprecated features:

Node.js 8 npm install --save datauri@3 docs: https://github.com/data-uri/datauri/blob/v3.0.0/docs/datauri.md

Node.js 4+ npm install --save datauri@2 docs: https://github.com/data-uri/datauri/blob/v2.0.0/docs/datauri.md