How do I convert an image to a base64-encoded data URL in sails.js or generally in the servers side JavaScript?
Javascriptnode.jssails.jsJavascript Problem Overview
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?
Javascript Solutions
Solution 1 - Javascript
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');
Solution 2 - Javascript
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.
Solution 3 - Javascript
//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);
}
)
Solution 4 - Javascript
//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");
Solution 5 - Javascript
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" />
}
}