How to Convert File Upload Into Blob Fs Node
Catechumen a Base64 data into an Image in Node.js
Learn how to convert an prototype into a base64 string and back to an image.
Bonus:
You will besides acquire how to compress images with Jimp.
Recently, I got involved in a project where images are returned from the browser in base64 format and we need to write the prototype to disk. I did some research to run into if i could become any detailed explanation on how things piece of work with base64, Buffer, binary and real images but couldn't discover whatever solution related to nodejs.
Trying to go this to work directly by reading an image with the fs.readFile... method and piping it back to an image would work perfectly because by default, fs.readFile... returns a Buffer and that is what nosotros demand. Here'due south an example.
const fs = require ( " fs " ); // Reads file in form buffer => <Buffer ff d8 ff db 00 43 00 ... const buffer = fs . readFileSync ( " path-to-image.jpg " ); // Pipes an image with "new-path.jpg" as the proper name. fs . writeFileSync ( " new-path.jpg " , buffer );
Things tend to get a bit more than complicated when you desire to convert a regular (base64) cord into an actual image. You need to first convert your string into Buffer before saving information technology as a existent image otherwise, you lot're going to run into issues.
// Base64 => Buffer => Image
Luckily, Node.js provides a native module chosen Buffer that can be used to perform Base64 encoding and decoding. Buffer is available as a global object which means that you don't need to explicitly require this module in your application.
Internally, Buffer represents binary information in the form of a sequence of bytes. The Buffer object provides several methods to perform different encoding and decoding conversions. This includes to and from UTF-8, UCS2, Base64, ASCII, UTF-16, and even the HEX encoding scheme.
Base64 Encoding
Let us first of all catechumen our image into base64 and then to Buffer
const fs = require ( " fs " ); // Create a base64 string from an image => ztso+Mfuej2mPmLQxgD ... const base64 = fs . readFileSync ( " path-to-image.jpg " , " base64 " ); // Convert base64 to buffer => <Buffer ff d8 ff db 00 43 00 ... const buffer = Buffer . from ( base64 , " base64 " );
Base64 To Image
At present y'all can convert the Buffer into an bodily image with just a single line of code:
// Pipes an image with "new-path.jpg" equally the name. fs . writeFileSync ( " new-path.jpg " , buffer );
Bonus
Image optimization is very of import these days because nearly images come in huge sizes and this will definitely boring down our websites. I'll be using Jimp to show you how to reduce paradigm quality on the fly past reducing the size of the Buffer information we receive and convert it into an bodily image.
Install Jimp:
yarn add together jimp # or npm install jimp
You can simply reduce the quality of your image by 50% with just a few lines of code. I am going to use a base64 cord as my information source.
const Jimp = require ( " jimp " ); const fs = crave ( " fs " ); // Base64 string const data = " 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 " ; // Convert base64 to buffer => <Buffer ff d8 ff db 00 43 00 ... const buffer = Buffer . from ( data , " base64 " ); Jimp . read ( buffer , ( err , res ) => { if ( err ) throw new Fault ( err ); res . quality ( v ). write ( " resized.jpg " ); });
I would love to requite some extra credits to the creators of Jimp because it solves most everything you would want to exercise with an bodily image in nodejs and has zero dependency. I've had aught issues using information technology in an electron application.
Decision
We were able to:
- Empathise how images work in nodejs on different stages.
- Convert from Buffer to base64.
- Convert from Buffer into an bodily image.
- Use Jimp to reduce image size.
If you made it to this point, and then I'grand going to say congratulations 🍻 considering y'all're awesome :).
I hope you find this helpful.
Happy codding 💻 🙂
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Source: https://dev.to/dnature/convert-a-base64-data-into-an-image-in-node-js-3f88
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