How do I convert an image to a base64-encoded data URL in sails.js or generally in the servers side JavaScript?

I am making a small app in sails.js and I need to store images in database. For that, I need to convert an image to a base64-encoded data URL so that I can save it as a string in my sails models. However, I don't know how to convert it in this form. All the older questions asked about converting an image to base64-encoded data URLs, and they answer this about doing it on the client side. However, I want to do it on the server side while I will be getting the image through a post request. How can I achieve this?

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最佳答案

As I understand you want to convert a file into base64 encoded string. Whether the file is image or not, that does not matter.

var fs = require('fs');


// function to encode file data to base64 encoded string
function base64_encode(file) {
// read binary data
var bitmap = fs.readFileSync(file);
// convert binary data to base64 encoded string
return new Buffer(bitmap).toString('base64');
}

Usage:

var base64str = base64_encode('kitten.jpg');

Source

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Here`s another simple way, use it when listing your images

@{
if (item.ImageData != null)
{
string imageBase64 = Convert.ToBase64String(item.ImageData);
string imageSrc = string.Format("data:image/gif;base64,{0}", imageBase64);
<img src="@imageSrc" width="100" height="100" />
}
}
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It can be achieved with readFileSync, passing in the image path as the first parameter and an encoding option as the second. As show below:

var fs = require('fs');


var imageAsBase64 = fs.readFileSync('./your-image.png', 'base64');

As per the node documentation:

fs.readFileSync(path[, options])

Synchronous version of fs.readFile(). Returns the contents of the path.

If the encoding option is specified then this function returns a string. Otherwise it returns a buffer.

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//instala via npm
npm install --save image-to-uri


//declara no codigo
const imageToUri = require('image-to-uri');


//implementa
let imagem = imageToUri("caminho da sua imagem");
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//You can use the image-to-base64

const imageToBase64 = require('image-to-base64');


imageToBase64("URL") // insert image url here.
.then( (response) => {
console.log(response);  // the response will be the string base64.
}
)
.catch(
(error) => {
console.log(error);
}
)

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