Questions tagged [node.js]
Node.js is an event-based, non-blocking, asynchronous I/O runtime that uses Google's V8 JavaScript engine and libuv library. It is used for developing applications that make heavy use of the ability to run JavaScript both on the client as well as on the server side and therefore benefit from the re-usability of code and the lack of context switching.
472,498
questions
417
votes
21
answers
311k
views
Get all directories within directory nodejs
I was hoping this would be a simple thing, but I cannot find anything out there to do so.
I just want to get all folders/directories within a given folder/directory.
So for example:
<MyFolder>...
- 18k
417
votes
7
answers
411k
views
Is there a way to force npm to generate package-lock.json?
I deleted it by accident and have made many changes to package.json since. An npm install or npm update do not generate package-lock.json anymore. I tried clearing my npm cache and my nvm cache, but ...
- 9,658
416
votes
16
answers
505k
views
Express.js: how to get remote client address
I don't completely understand how I should get a remote user IP address.
Let's say I have a simple request route such as:
app.get(/, function (req, res){
var forwardedIpsStr = req.header('x-...
- 14.4k
415
votes
6
answers
688k
views
How to extract request http headers from a request using NodeJS connect
I'd like to get the "Host" header of a request made using Node JS's connect library bundle. My code looks like:
var app = connect()
.use(connect.logger('dev'))
.use(connect.static('public'))
....
- 55.1k
415
votes
10
answers
275k
views
How do I determine the current operating system with Node.js
I'm writing a couple of node shell scripts for use when developing on a platform. We have both Mac and Windows developers. Is there a variable I can check for in Node to run a .sh file in one instance ...
- 41.7k
414
votes
23
answers
707k
views
Can you force Vue.js to reload/re-render?
Just a quick question.
Can you force Vue.js to reload/recalculate everything? If so, how?
- 12.3k
414
votes
9
answers
550k
views
How to create an HTTPS server in Node.js?
Given an SSL key and certificate, how does one create an HTTPS service?
- 49.7k
412
votes
31
answers
366k
views
"NODE_ENV" is not recognized as an internal or external command, operable command or batch file
I'm trying to setup an environment for a Node.js app. but I'm getting this error every time.
"NODE_ENV" is not recognized as an internal or external command,
operable command or batch file.
...
- 6,197
410
votes
15
answers
257k
views
How to run Gulp tasks sequentially one after the other
in the snippet like this:
gulp.task "coffee", ->
gulp.src("src/server/**/*.coffee")
.pipe(coffee {bare: true}).on("error",gutil.log)
.pipe(gulp.dest "bin")
gulp.task "clean",-...
- 35.4k
406
votes
19
answers
356k
views
Node.js: what is ENOSPC error and how to solve?
I have a problem with Node.js and uploading files to server. For uploading files to server I use this plugin. When starting file upload to the server, Node.js process crashed and show error:
Error: ...
- 4,191
404
votes
19
answers
1.1m
views
Node.js getaddrinfo ENOTFOUND
When using Node.js to try and get the html content of the following web page:
eternagame.wikia.com/wiki/EteRNA_Dictionary
I get the following error:
events.js:72
throw er; // Unhandled 'error' ...
- 5,690
403
votes
12
answers
196k
views
Should I check in folder "node_modules" to Git when creating a Node.js app on Heroku?
I followed the basic getting started instructions for Node.js on Heroku here:
https://devcenter.heroku.com/categories/nodejs
These instructions don't tell you to create a .gitignore node_modules, and ...
- 4,093
403
votes
5
answers
322k
views
How to list all versions of an npm module?
In order to see all the versions of a node module [webpack], I have executed below command in windows command prompt
npm view webpack versions
This command only displays first 100 versions and later ...
- 14.5k
402
votes
10
answers
288k
views
Call a "local" function within module.exports from another function in module.exports?
How do you call a function from within another function in a module.exports declaration?
app.js
var bla = require('./bla.js');
console.log(bla.bar());
bla.js
module.exports = {
foo: function (...
- 17.5k
402
votes
7
answers
320k
views
Folder structure for a Node.js project
I notice that Node.js projects often include folders like these:
/libs, /vendor, /support, /spec, /tests
What exactly do these mean? What's the different between them, and where should I include ...
- 17.3k
401
votes
39
answers
517k
views
NPM Install Error:Unexpected end of JSON input while parsing near '...nt-webpack-plugin":"0'
When creating a new Angular 5 project:
node version: 8.9.2
npm version: 5.5.1
My Command is:
npm install -g @angular/cli
The Error is:
npm ERR! **Unexpected end of JSON input while parsing near '......
- 4,275
401
votes
9
answers
124k
views
Differences between express.Router and app.get?
I'm starting with NodeJS and Express 4, and I'm a bit confused. I have been reading the Express website, but can't see when to use a route handler or when to use express.Router.
As I could see if I ...
- 4,463
399
votes
8
answers
66k
views
Detect if called through require or directly by command line
How can I detect whether my Node.JS file was called using SH:node path-to-file or JS:require('path-to-file')?
This is the Node.JS equivalent to my previous question in Perl: How can I run my Perl ...
- 86.5k
398
votes
5
answers
536k
views
Is there a compatibility list for Angular / Angular-CLI and Node.js?
I periodically run into the problem, having to spin up old Angular projects with deprecated dependencies of Angular.
Because I unsually run the latest Node.js version (at least lates LTS version) I ...
- 8,001
398
votes
10
answers
298k
views
Apache and Node.js on the Same Server
I want to use Node because it's swift, uses the same language I am using on the client side, and it's non-blocking by definition. But the guy who I hired to write the program for file handling (...
- 5,613
397
votes
46
answers
809k
views
Node.js Port 3000 already in use but it actually isn't?
I have been working with a node.js project for a few weeks and it has been working great. Usually, I use npm start to run my app and view it in a browser on localhost, port 3000.
Today, I started to ...
- 5,743
396
votes
49
answers
431k
views
Node.js fs.readdir recursive directory search
Any ideas on an async directory search using fs.readdir? I realize that we could introduce recursion and call the read directory function with the next directory to read, but I'm a little worried ...
- 9,548
396
votes
18
answers
196k
views
node.js require() cache - possible to invalidate?
From the node.js documentation:
Modules are cached after the first time they are loaded. This means (among other things) that every call to require('foo') will get exactly the same object returned, ...
- 13.5k
395
votes
8
answers
643k
views
How to install npm peer dependencies automatically?
For example, when I install Angular2:
npm install --save angular2
[email protected] /Users/doug/Projects/dougludlow/temp
├── [email protected]
├── UNMET PEER DEPENDENCY es6-promise@^3.0.2
├── UNMET ...
- 10.8k
394
votes
19
answers
301k
views
Why does JSHint throw a warning if I am using const?
This is the error I get when using const:
<error line="2" column="1" severity="warning" message="'const' is available in ES6 (use esnext option) or Mozilla JS extensions (use moz)...
- 3,955
394
votes
25
answers
653k
views
possible EventEmitter memory leak detected
I am getting following warning:
(node) warning: possible EventEmitter memory leak detected. 11 listeners added. Use emitter.setMaxListeners() to increase limit.
Trace:
at EventEmitter.<...
- 10.1k
393
votes
15
answers
370k
views
node.js require all files in a folder?
How do I require all files in a folder in node.js?
need something like:
files.forEach(function (v,k){
// require routes
require('./routes/'+v);
}};
- 54.1k
393
votes
24
answers
175k
views
`npm install` fails on node-gyp rebuild with `gyp: No Xcode or CLT version detected!`
Every time I try npm install. I get the following error. How do I fix it?
gyp: No Xcode or CLT version detected!
I am on node -v → v8.8.0 & npm -v → v6.11.3
I tried to run it on VSCode terminal ...
- 4,263
391
votes
43
answers
2.0m
views
'npm' is not recognized as internal or external command, operable program or batch file
I am completely new to nodejs. I am trying to get nodejs to work on my Windows 2008 box in order to install Karma which I would use for TDDing my AngularJs code. I have done the following steps so far
...
- 8,169
391
votes
1
answer
478k
views
NodeJS: How to decode base64 encoded string back to binary? [duplicate]
I was implementing password hashing with salt, so I generated salt as binary, hashed the password, base64 encoded the password and salt then stored them into database.
Now when I am checking password,...
- 8,620
390
votes
22
answers
241k
views
nodejs vs node on ubuntu 12.04
I installed nodejs on ubuntu from instructions given here
When I write node --version in the terminal I see this :
-bash: /usr/sbin/node: No such file or directory
I can see node in the /usr/sbin/ ...
- 14.2k
389
votes
18
answers
242k
views
Const in JavaScript: when to use it and is it necessary?
I've recently come across the const keyword in JavaScript. From what I can tell, it is used to create immutable variables, and I've tested to ensure that it cannot be redefined (in Node.js):
const x = ...
- 4,035
388
votes
16
answers
269k
views
How to install a private NPM module without my own registry?
I've taken some shared code and put it in an NPM module, one I don't want to upload to the central registry. The question is, how do I install it from other projects?
The obvious way is probably to ...
- 8,338
387
votes
8
answers
128k
views
setImmediate vs. nextTick
Node.js version 0.10 was released today and introduced setImmediate. The API changes documentation suggests using it when doing recursive nextTick calls.
From what MDN says it seems very similar to ...
- 274k
387
votes
6
answers
227k
views
What is the parameter "next" used for in Express?
Suppose you have a simple block of code like this:
app.get('/', function(req, res){
res.send('Hello World');
});
This function has two parameters, req and res, which represent the request and ...
- 41.3k
384
votes
9
answers
318k
views
MySQL with Node.js
I've just started getting into Node.js. I come from a PHP background, so I'm fairly used to using MySQL for all my database needs.
How can I use MySQL with Node.js?
- 9,548
381
votes
38
answers
512k
views
Node.js EACCES error when listening on most ports
I'm testing out an app (hopefully to run on heroku, but am having issues locally as well). It's giving me an EACCES error when it runs http.Server.listen() - but it only occurs on some ports.
So, ...
- 7,243
379
votes
21
answers
401k
views
Eslint: How to disable "unexpected console statement" in Node.js?
I'm using eslint with Sublime Text 3 and I am writing gulpfile.js.
/*eslint-env node*/
var gulp = require('gulp');
gulp.task('default', function(){
console.log('default task');
});
But eslint ...
- 4,472
379
votes
30
answers
1.4m
views
sudo: npm: command not found
I'm trying to upgrade to the latest version of node. I'm following the instructions at http://davidwalsh.name/upgrade-nodejs
But when I do:
sudo npm install -g n
I get the error:
sudo: npm: command ...
- 4,808
379
votes
4
answers
202k
views
Code coverage with Mocha
I am using Mocha for testing my NodeJS application. I am not able to figure out how to use its code coverage feature. I tried googling it but did not find any proper tutorial. Please help.
- 10.8k
379
votes
11
answers
158k
views
Is it possible to pass a flag to Gulp to have it run tasks in different ways?
Normally in Gulp tasks look like this:
gulp.task('my-task', function() {
return gulp.src(options.SCSS_SOURCE)
.pipe(sass({style:'nested'}))
.pipe(autoprefixer('last 10 version'))
...
- 6,778
378
votes
14
answers
469k
views
npm install won't install devDependencies
On windows for some reason when I run npm install it won't install devDependencies. AFAIK it should. If I run npm install --dev devDependencies are installed. I don't understand why npm install doesn'...
- 5,737
377
votes
16
answers
335k
views
Secure random token in Node.js
In this question Erik needs to generate a secure random token in Node.js. There's the method crypto.randomBytes that generates a random Buffer. However, the base64 encoding in node is not url-safe, it ...
- 19.5k
377
votes
17
answers
1.2m
views
How to run a hello.js file in Node.js on windows?
I am trying to run a hello world program written in javascript in a separate file named hello.js
Currently running windows version of node.js.
The code runs perfectly in console window but how do I ...
- 9,784
374
votes
17
answers
552k
views
No 'Access-Control-Allow-Origin' - Node / Apache Port Issue
i've created a small API using Node/Express and trying to pull data using Angularjs but as my html page is running under apache on localhost:8888 and node API is listen on port 3000, i am getting the ...
- 3,859
372
votes
25
answers
552k
views
How to generate unique ID with node.js
function generate(count) {
var founded = false,
_sym = 'abcdefghijklmnopqrstuvwxyz1234567890',
str = '';
while(!founded) {
for(var i = 0; i < count; i++) {
...
- 4,371
371
votes
5
answers
179k
views
What's the difference between path.resolve and path.join?
Is there some difference between the following invocations?
path.join(__dirname, 'app')
vs.
path.resolve(__dirname, 'app')
Which one should be preferred?
- 60.8k
368
votes
17
answers
779k
views
Get data from fs.readFile [duplicate]
var content;
fs.readFile('./Index.html', function read(err, data) {
if (err) {
throw err;
}
content = data;
});
console.log(content);
Logs undefined, why?
- 26.8k
367
votes
24
answers
595k
views
E11000 duplicate key error index in mongodb mongoose
Following is my user schema in user.js model -
var userSchema = new mongoose.Schema({
local: {
name: { type: String },
email : { type: String, require: true, unique: true },
...
- 5,926
366
votes
39
answers
546k
views
How to Delete node_modules - Deep Nested Folder in Windows
Upon trying to remove the node_modules directory created by npm install:
The source file name(s) are larger than is supported by the file
system. Try moving to a location which has a shorter ...
- 10.5k