All Questions
77,607
questions
2105
votes
18
answers
2.1m
views
Writing to files in Node.js
I've been trying to find a way to write to a file when using Node.js, but with no success. How can I do that?
- 22.9k
1588
votes
26
answers
1.9m
views
How to get GET (query string) variables in Express.js on Node.js?
Can we get the variables in the query string in Node.js just like we get them in $_GET in PHP?
I know that in Node.js we can get the URL in the request. Is there a method to get the query string ...
- 29.9k
1214
votes
49
answers
2.1m
views
Error: Can't set headers after they are sent to the client
I'm fairly new to Node.js and I am having some issues.
I am using Node.js 4.10 and Express 2.4.3.
When I try to access http://127.0.0.1:8888/auth/facebook, i'll be redirected to http://127.0.0.1:...
- 14k
919
votes
12
answers
667k
views
Error "npm WARN package.json: No repository field"
I installed Express.js with the following command:
sudo npm install -g express
I get the following warnings:
npm WARN package.json [email protected] No repository field.
npm WARN package.json fresh@...
- 17.3k
919
votes
24
answers
948k
views
How to access POST form fields in Express
Here is my simple form:
<form id="loginformA" action="userlogin" method="post">
<div>
<label for="email">Email: </label>
<input type="text" id="email" ...
- 49.7k
809
votes
31
answers
755k
views
Error: request entity too large
I'm receiving the following error with express:
Error: request entity too large
at module.exports (/Users/michaeljames/Documents/Projects/Proj/mean/node_modules/express/node_modules/connect/...
- 9,210
767
votes
37
answers
894k
views
Why doesn't adding CORS headers to an OPTIONS route allow browsers to access my API?
I am trying to support CORS in my Node.js application that uses the Express.js web framework. I have read a Google group discussion about how to handle this, and read a few articles about how CORS ...
- 8,330
693
votes
10
answers
755k
views
How to access the GET parameters after "?" in Express?
I know how to get the params for queries like this:
app.get('/sample/:id', routes.sample);
In this case, I can use req.params.id to get the parameter (e.g. 2 in /sample/2).
However, for url like /...
- 46.2k
690
votes
21
answers
797k
views
How to get the full URL in Express?
Let's say my sample URL is
http://example.com/one/two
and I say I have the following route
app.get('/one/two', function (req, res) {
var url = req.url;
}
The value of url will be /one/two.
How ...
- 41.1k
689
votes
13
answers
478k
views
bodyParser is deprecated express 4
I am using express 4.0 and I'm aware that body parser has been taken out of the express core, I am using the recommended replacement, however I am getting
body-parser deprecated bodyParser: use ...
- 11.8k
650
votes
6
answers
188k
views
Express.js - app.listen vs server.listen
This may be a very basic question but I simply don't get it. What is the difference between creating an app using Express.js and starting the app listening on port 1234, for example:
var express = ...
- 11.1k
633
votes
10
answers
668k
views
Enabling HTTPS on express.js
I'm trying to get HTTPS working on express.js for node, and I can't figure it out.
This is my app.js code.
var express = require('express');
var fs = require('fs');
var privateKey = fs.readFileSync('...
- 46.4k
605
votes
11
answers
1.1m
views
Proper way to return JSON using node or Express
So, one can attempt to fetch the following JSON object:
$ curl -i -X GET http://echo.jsontest.com/key/value/anotherKey/anotherValue
HTTP/1.1 200 OK
Access-Control-Allow-Origin: *
Content-Type: ...
- 13.4k
582
votes
21
answers
214k
views
ExpressJS How to structure an application?
I'm using the ExpressJS web framework for NodeJS.
People using ExpressJS put their environments (development, production, test...), their routes etc on the app.js. I think that it's not a beautiful ...
- 40.4k
558
votes
52
answers
720k
views
Express.js req.body undefined
I have this as configuration of my Express server
app.use(app.router);
app.use(express.cookieParser());
app.use(express.session({ secret: "keyboard cat" }));
app.set('view engine', 'ejs');
app.set("...
- 20.9k
505
votes
10
answers
241k
views
What is Express.js? [closed]
I am a learner in Node.js.
What's Express.js?
What's the purpose of it with Node.js?
Why do we actually need Express.js? How is it useful for us to use with Node.js?
What's Redis? Does it come with ...
- 8,410
500
votes
11
answers
456k
views
What does body-parser do with express?
I don't understand why we need body-parser in an Express application, as we can get data without using body-parser.
And what does it do actually and how?
- 5,145
485
votes
7
answers
198k
views
Understanding passport serialize deserialize
How would you explain the workflow of Passport's serialize and deserialize methods to a layman.
Where does user.id go after passport.serializeUser has been called?
We are calling passport....
- 7,188
478
votes
26
answers
617k
views
How can I set NODE_ENV=production on Windows?
In Ubuntu it's quite simple; I can run the application using:
$ NODE_ENV=production node myapp/app.js
However, this doesn't work on Windows. Is there a configuration file where I can set the ...
- 15.8k
459
votes
32
answers
374k
views
NodeJS / Express: what is "app.use"?
In the docs for the NodeJS express module, the example code has app.use(...).
What is the use function and where is it defined?
- 39.7k
452
votes
7
answers
642k
views
Download a file from NodeJS Server using Express
How can I download a file that is in my server to my machine accessing a page in a nodeJS server?
I'm using the ExpressJS and I've been trying this:
app.get('/download', function(req, res){
var ...
448
votes
19
answers
1.2m
views
How do I debug error ECONNRESET in Node.js?
I'm running an Express.js application using Socket.io for a chat webapp
and I get the following error randomly around 5 times during 24h.
The node process is wrapped in forever and it restarts itself ...
440
votes
4
answers
674k
views
How to get a URL parameter in Express?
I am facing an issue on getting the value of tagid from my URL: localhost:8888/p?tagid=1234.
Help me out to correct my controller code. I am not able to get the tagid value.
My code is as follows:
...
- 4,443
436
votes
31
answers
511k
views
req.body empty on posts
All of a sudden this has been happening to all my projects.
Whenever I make a post in nodejs using express and body-parser req.body is an empty object.
var express = require('express')
var ...
- 4,915
435
votes
34
answers
1.5m
views
Start script missing error when running npm start
I'm receiving this error when trying to debug my node application using the npm start command.
Error:
npm ERR! Windows_NT 6.3.9600
npm ERR! argv "C:\\Program Files\\nodejs\\\\node.exe" "...
- 4,973
425
votes
8
answers
679k
views
How do I consume the JSON POST data in an Express application
I'm sending the following JSON string to my server.
(
{
id = 1;
name = foo;
},
{
id = 2;
name = bar;
}
)
On the server I have this.
app.post('...
- 54.7k
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
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
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
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
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
359
votes
26
answers
379k
views
Express-js can't GET my static files, why?
I've reduced my code to the simplest express-js app I could make:
var express = require("express"),
app = express.createServer();
app.use(express.static(__dirname + '/styles'));
app.listen(3001);
...
- 36.5k
356
votes
10
answers
609k
views
How do I redirect in expressjs while passing some context?
I am using express to make a web app in node.js. This is a simplification of what I have:
var express = require('express');
var jade = require('jade');
var http = require("http");
var app = express()...
- 24.7k
349
votes
24
answers
574k
views
How do I remove documents using Node.js Mongoose?
FBFriendModel.find({
id: 333
}, function (err, docs) {
docs.remove(); //Remove all the documents that match!
});
The above doesn't seem to work. The records are still there.
Can someone fix?...
- 266k
343
votes
14
answers
337k
views
How to call a Python function from Node.js
I have an Express Node.js application, but I also have a machine learning algorithm to use in Python. Is there a way I can call Python functions from my Node.js application to make use of the power of ...
- 7,615
342
votes
32
answers
248k
views
Extend Express Request object using Typescript
I’m trying to add a property to express request object from a middleware using typescript. However I can’t figure out how to add extra properties to the object. I’d prefer to not use bracket notation ...
- 3,637
340
votes
17
answers
731k
views
How to access the request body when POSTing using Node.js and Express?
I have the following Node.js code:
var express = require('express');
var app = express.createServer(express.logger());
app.use(express.bodyParser());
app.post('/', function(request, response) {
...
- 5,748
337
votes
4
answers
336k
views
How to search in array of object in mongodb
Suppose the mongodb document(table) 'users' is
{
_id: 1,
name: {
first: 'John',
last: 'Backus'
},
birth: new Date('Dec 03, 1924'),
death: new Date('Mar 17, 2007'),
...
- 4,098
335
votes
18
answers
573k
views
TypeError: Router.use() requires middleware function but got a Object
There have been some middleware changes on the new version of express and I have made some changes in my code around some of the other posts on this issue but I can't get anything to stick.
We had it ...
- 3,813
331
votes
12
answers
493k
views
Push items into mongo array via mongoose
Basically I have a mongodb collection called 'people'
whose schema is as follows:
people: {
name: String,
friends: [{firstName: String, lastName: String}]
}
Now, I have a ...
- 3,717
329
votes
21
answers
676k
views
Make Axios send cookies in its requests automatically
I am sending requests from the client to my Express.js server using Axios.
I set a cookie on the client and I want to read that cookie from all Axios requests without adding them manually to request ...
- 8,459
323
votes
9
answers
247k
views
Passing variables to the next middleware using next() in Express.js
I want to pass some variable from the first middleware to another middleware, and I tried doing this, but there was "req.somevariable is a given as 'undefined'".
//app.js
..
app.get('/...
- 3,249
321
votes
33
answers
548k
views
Render basic HTML view?
I have a basic Node.js app that I am trying to get off the ground using the Express framework. I have a views folder where I have an index.html file. But I receive the following error when loading the ...
- 20k
312
votes
16
answers
693k
views
Stop all instances of Node.js server
I have started a Node server through the plugin of an IDE. Unfortunately, I cannot use the IDE's terminal. So I tried to run the script from the command line.
This is the problem - I am using the ...
- 4,354
306
votes
4
answers
85k
views
Node.js / Express.js - How does app.router work?
Before I ask about app.router I think I should explain at least what I think happens when working with middleware. To use middleware, the function to use is app.use(). When the middleware is being ...
- 11.6k
300
votes
13
answers
336k
views
How to include route handlers in multiple files in Express? [duplicate]
In my NodeJS express application I have app.js that has a few common routes. Then in a wf.js file I would like to define a few more routes.
How can I get app.js to recognize other route handlers ...
- 4,566
289
votes
14
answers
335k
views
File uploading with Express 4.0: req.files undefined
I'm attempting to get a simple file upload mechanism working with Express 4.0 but I keep getting undefined for req.files in the app.post body. Here is the relevant code:
var bodyParser = require('...
- 3,401
284
votes
9
answers
178k
views
Difference between app.use and app.get in express.js
I'm kind of new to express and node.js, and I can't figure out the difference between app.use and app.get. It seems like you can use both of them to send information. For example:
app.use('/',...
- 2,865
281
votes
22
answers
346k
views
Avoid "current URL string parser is deprecated" warning by setting useNewUrlParser to true
I have a database wrapper class that establishes a connection to some MongoDB instance:
async connect(connectionString: string): Promise<void> {
this.client = await MongoClient.connect(...
- 17.3k