NodeJS write binary buffer into a file

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I am not sure if this would help but try to change the b variable to the bytes variable in the line below at least you would be able to view the file in a test editor

fs.writeFile("test.txt", b,  "binary",function(err) { });

If you would like to have the numbers space separated try the code below:

var fs = require('fs');

var foo = "71%73%70%56%57%97%50%0%50%0%247%0%0%150%140%115%102%94%69%198%187%159%123%114%90%71%71%71%138%129%101%202%193%166%201%193%172%238%234%221%200%197%188%140"
var bytes = foo.split("%");

var b = new Buffer(bytes.length);
var c = "";
for (var i = 0;i < bytes.length;i++) {
    b[i] = bytes[i];
    c = c + " " + bytes[i]
}

fs.writeFile("test.txt", c,  "binary",function(err) {
    if(err) {
        console.log(err);
    } else {
        console.log("The file was saved!");
    }
});

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