base64-buffer-thumbnail

About

Generate an image thumbnail using base64 and buffers only!.

Purpose?

This module will generate an image thumbnail.

By default the thumbnail's file format will be the same than the source file. You can use the jpegOptions option to force output to jpeg.

Usage

Base64BufferThumbnail(source, options)

Async/Await (Typescript & ES7)

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
try {
    const thumbnail = await Base64BufferThumbnail('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==');
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

Using promises (node 8.x)

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
Base64BufferThumbnail(('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==')
    .then(thumbnail => { console.log(thumbnail) })
    .catch(err => console.error(err));

Examples

From Base64

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
try {
    const thumbnail = await Base64BufferThumbnail('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==');
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

From Buffer

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
try {
    const imageBuffer = fs.readFileSync('resources/images/valais.jpg');
 
    const thumbnail = await Base64BufferThumbnail(imageBuffer);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

Options

• options:
  • percentage [0-100] - image thumbnail percentage. Default = 10
  • width [number] - image thumbnail width.
  • height [number] - image thumbnail height.
  • responseType ['buffer' || 'base64'] - response output type. Default = 'buffer'
  • jpegOptions [0-100] - Example: { force:true, quality:100 }
  • fit [string] - method by which the image should fit the width/height. Default = contain (details)

Examples

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
let options = { percentage: 25, responseType: 'base64' }
 
try {
    const thumbnail = await Base64BufferThumbnail('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==', options);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
let options = { width: 100, height: 100, responseType: 'base64' }
 
try {
    const thumbnail = await Base64BufferThumbnail('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==', options);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

const Base64BufferThumbnail = require('base64-buffer-thumbnail');
 
let options = { width: 100, height: 100, responseType: 'base64', jpegOptions: { force:true, quality:90 } }
 
try {
    const thumbnail = await Base64BufferThumbnail('/9j/4AAQSkZJRgABAQEBLAEsAAD/4QEERXhpZgAA==', options);
    console.log(thumbnail);
} catch (err) {
    console.error(err);
}

License

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