fs

I want to create a write stream and write to it as my data comes in. However, I am able to create the file but nothing is written to it. Eventually, the process runs out of memory. The problem, I've discovered is that I'm calling write() whilst inside a loop. Here's a simple example: 'use strict' var fs = require('fs'); var wstream = fs.createWriteStream('myOutput.txt'); for (var i = 0; i < 10000000000; i++) { wstream.write(i+'\n'); } console.log('End!') wstream.end(); Nothing ever gets written, not even hello. But why? How can I write to the file within a loop? To supplement @MikeC's

I have an array which keeps URL of several files. For example: var files = ['1.html', '2.html', '3.html']; I need to read them asynchronously and save them in an object named cache (cache = {}). To do this I used the code: for(var i = 0; i < files.length; i++){ require('fs').readFile(files[i], 'utf8', function (error,data) { cache[files[i]]=data; }); } In the end I have the result: cache = { undefined : 'File 3 content' } I do understand that the "readFile" acts after the loop is ended and it looses it's scope. Is there a way to fix this or another method to read files from an array and cache

I can't seem to get any search results that explain how to do this. All I want to do is be able to know if a given path is a file or a directory (folder). Jason Sperske fs.lstatSync(path_string).isDirectory() should tell you. From the docs : Objects returned from fs.stat() and fs.lstat() are of this type. stats.isFile() stats.isDirectory() stats.isBlockDevice() stats.isCharacterDevice() stats.isSymbolicLink() (only valid with fs.lstat()) stats.isFIFO() stats.isSocket() NOTE: The above solution will throw an Error if; for ex, the file or directory doesn't exist. If you want a truthy or falsy

How do I use chmod with Node.js? There is a method in the package fs , which should do this, but I don't know what it takes as the second argument. fs.chmod(path, mode, [callback]) Asynchronous chmod(2). No arguments other than a possible exception are given to the completion callback. fs.chmodSync(path, mode) Synchronous chmod(2). (from the Node.js documentation ) If I do something like fs.chmodSync('test', 0755); nothing happens (the file isn't changed to that mode). fs.chmodSync('test', '+x'); doesn't work either. I'm working on a Windows machine btw. qiao according to its sourcecode /lib

I want to create a simple Log System, which prints a line before the past line into a txt file by using Node.js, but i dont know how the File System from Node.js works. Can someone explain it ? Inserting data into the middle of a text file is not a simple task. If possible, you should append it to the end of your file. The easiest way to append data some text file is to use build-in fs.appendFile(filename, data[, options], callback) function from fs module : var fs = require('fs') fs.appendFile('log.txt', 'new data', function (err) { if (err) { // append failed } else { // done } }) But if you