Questions tagged [express]
Express.js is a minimal and flexible Node.js web application framework providing a robust set of features for building web applications.
express
95,790
questions
2111
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?
- 23k
1597
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 ...
- 30k
1221
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
920
votes
24
answers
956k
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" ...
- 49.9k
916
votes
12
answers
668k
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
818
votes
34
answers
776k
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/...
- 9,300
768
votes
37
answers
904k
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 ...
- 8,340
698
votes
10
answers
764k
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 /...
- 46.5k
693
votes
21
answers
808k
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 ...
- 41.5k
688
votes
13
answers
480k
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
653
votes
6
answers
189k
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 = ...
- 11.2k
634
votes
10
answers
677k
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('...
- 46.5k
608
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: ...
- 13.5k
581
votes
21
answers
215k
views
How to structure an ExpressJS application? [closed]
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 is not a beautiful way ...
- 40.6k
563
votes
53
answers
735k
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("...
- 21.1k
504
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
503
votes
11
answers
463k
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?
- 5,175
485
votes
7
answers
200k
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
626k
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
463
votes
33
answers
379k
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?
- 40.1k
455
votes
7
answers
649k
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 ...
453
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 ...
443
votes
4
answers
682k
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:
...
- 4,473
443
votes
27
answers
1.1m
views
Request header field Access-Control-Allow-Headers is not allowed by itself in preflight response
I have come across CORS issues multiple times and can usually fix it but I want to really understand by seeing this from a MEAN stack paradigm.
Before I simply added middleware in my express server ...
- 5,295
436
votes
31
answers
520k
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
436
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" "...
- 4,983
434
votes
8
answers
688k
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('...
- 55k
422
votes
16
answers
515k
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-...
- 14.5k
402
votes
10
answers
289k
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
9
answers
126k
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 ...
- 4,493
387
votes
6
answers
229k
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 ...
- 41.4k
375
votes
17
answers
559k
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 ...
- 3,869
374
votes
25
answers
564k
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++) {
...
- 4,391
359
votes
26
answers
382k
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);
...
- 36.7k
357
votes
10
answers
615k
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()...
- 24.8k
348
votes
24
answers
578k
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?...
- 268k
348
votes
33
answers
258k
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 ...
- 3,697
345
votes
17
answers
751k
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) {
...
- 5,808
345
votes
14
answers
345k
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 ...
- 7,665
341
votes
18
answers
583k
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 ...
- 3,873
339
votes
23
answers
701k
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 ...
- 8,589
339
votes
4
answers
340k
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'),
...
- 4,108
331
votes
12
answers
500k
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
324
votes
10
answers
252k
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('/...
- 3,259
321
votes
33
answers
552k
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 ...
- 20.1k
315
votes
16
answers
710k
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 ...
- 4,384
305
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
339k
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
288
votes
14
answers
339k
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('...
- 3,391
284
votes
9
answers
180k
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