I'm trying to read an image from client side encoded in base64. How to read with nodejs?
My code:
// add to buffer base64 image
var encondedImage = new Buffer(image.name, 'base64');
fs.readFile(encondedImage, "base64", function(err, buffer){
if ( err ) {
console.log('In read file')
console.log(err)
} else {
// check err
lwip.open(buffer, 'jpg', function(err, image){
console.log('in open')
if ( err ) console.log(err)
if ( image ) console.log(image)
// check 'err'. use 'image'.
// image.resize(...), etc.
});
}
})
But, I got this error:
In read file
[Error: Path must be a string without null bytes.]
Latest and greatest way to do this:
Node supports file and buffer operations with the base64 encoding:
const fs = require('fs');
const contents = fs.readFileSync('/path/to/file.jpg', {encoding: 'base64'});
Or using the new promises API:
const fs = require('fs').promises;
const contents = await fs.readFile('/path/to/file.jpg', {encoding: 'base64'});
I think that the following example demonstrates what you need: I removed the link because it was broken.
The essence of the article is this code part:
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');
}
// function to create file from base64 encoded string
function base64_decode(base64str, file) {
// create buffer object from base64 encoded string, it is important to tell the constructor that the string is base64 encoded
var bitmap = new Buffer(base64str, 'base64');
// write buffer to file
fs.writeFileSync(file, bitmap);
console.log('******** File created from base64 encoded string ********');
}
// convert image to base64 encoded string
var base64str = base64_encode('kitten.jpg');
console.log(base64str);
// convert base64 string back to image
base64_decode(base64str, 'copy.jpg');
var fs = require('fs');
function base64Encode(file) {
var body = fs.readFileSync(file);
return body.toString('base64');
}
var base64String = base64Encode('test.jpg');
console.log(base64String);