NodeJs running ImageMagick convert all images from directory - node.js

Question

This is basic imagemagick setup for node.js that i came across lately. I understand that question i'm asking is very newbie but i'm new to node js and imagemagick and i wanted to try to make it dynamic. Current script bellow is cropping one specific file, is there a way to make it to apply conversion to all the files from directory /before and then output it to directory /after ? Also the operation i want to do for all the images in directory is to apply watermark on each (crop operation in code is just from example).
var http = require("http");
var im = require("imagemagick");
var args = [
"image.png",
"-crop",
"120x80+30+15",
"output.png"
];
var server = http.createServer(function(req, res) {
im.convert(args, function(err) {
if(err) { throw err; }
res.end("Image crop complete");
});
}).listen(8080);

Answer 1

Yes, you can do it by implementing foreach by all files itself.
Also you will need to install async module:
npm install async
Example code:
var async = require('async'),
fs = require('fs'),
im = require('imagemagick'),
maxworkers = require('os').cpus().length,
path = require('path');
module.exports = resize;
function resize(params) {
var queue = async.queue(resizeimg, maxworkers);
fs.readdir(params.src, function(err, files) {
files.forEach(function(file) {
queue.push({
src: path.join(params.src, '/', file),
dest: path.join(params.dest, '/', file),
width: params.width,
height: params.height
})
});
});
}
function resizeimg(params, cb) {
var imoptions = {
srcPath: params.src,
dstPath: params.dest
};
if (params.width !== undefined) imoptions.width = params.width;
if (params.height !== undefined) imoptions.height = params.height
im.resize(imoptions, cb);
}
Then in you code:
var http = require("http");
var resize = require("./resize");
var server = http.createServer(function(req, res) {
resize({
src: '/source/folder',
dest: '/destination/folder',
width: 300
});
}).listen(8080);