Develop Reference

Node Function Running Twice

I am using a simple JS script to query a Postgres DB. I simply want to write a simple query to the webpage, but every time I think I'm calling the function, it calls twice
// query the db
rate = () => pool
.query(rateQuery)
.then(res => {return res.rows[0]})
.catch(err => console.log('error: ', err.stack))
const app = http.createServer((request, response) => {
// set response header
response.writeHead(200, { 'Content-Type': 'text/html' });
// get result of promise
r = rate()
.then(res => response.write(JSON.stringify(res), () => {console.log("DONE"); response.end()}))
.catch(err => console.log('error: ', err.stack))
});
app.listen(3000);
When the page is refreshed, it prints DONE twice but I only want it once, any help is much appreciated - thanks.

If you add console.log(request.url) in your request handler, you will likely see that that the second request is when the browser asks your server for the /favicon.ico that represents the site. Browsers do this. When a user types in a URL for a site and hits enter, the browser requests that URL from the target site and then it also asks for /favicon.ico if there wasn't a previously cached icon already for that site.
In general, you should not have an http request handler like this that pays no attention to the request URL path because then you will process anything that the browser or a search crawler or anything sends you. Instead, you should look for a specific URL path and only do your work when it's the desired path and return a 404 response for all other paths.
I'd suggest you change your request handler to this:
const app = http.createServer((request, response) => {
// set response header
if (request.url === "/") {
// get result of promise
rate().then(res => {
response.writeHead(200, { 'Content-Type': 'text/plain' });
response.write(JSON.stringify(res), () => {
response.end();
console.log("DONE");
});
}).catch(err => {
console.log('error: ', err.stack);
response.writeHead(500);
response.end();
});
} else {
response.writeHead(404, "unknown URL");
response.end();
}
});
Note: I change the content-type to text/plain. You had it as text/html, but you weren't sending html at all. You could perhaps make the content-type application/json, but in any case when you're sending JSON, it's not HTML.
This also incorporates cleaner error handling where all error paths send an error response.
P.S. Writing out this simple request handler using the plain http.createServer() request handler reminds me of how much simpler it is to use Express for request handler implementations. It handles so much of this for you while still giving you full control. It's lightweight and simpler.
FYI, here's the program written using Express:
const express = require('express');
const app = express();
app.get("/", (req, res) => {
rate().then(res => {
res.json(res);
}).catch(err => {
console.log(err);
res.sendStatus(500);
});
});
// if we get here, then no other request handler handled the incoming request
// so we send back a 404
app.use((req, res) => {
res.sendStatus(404);
});
app.listen(3000);

There is one possibility. rate already is a function which you defined as
// query the db
rate = () => pool
.query(..........
Therefore, I don't think you would need parenthesis when you call it. Change from this
// get result of promise
r = rate()
.then .........
to this
// get result of promise
r = rate
.then .........

When I'm making a POST requestion in my login page [duplicate]

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://127.0.0.1:8888/auth/facebook_callback.
I then received the following error:
Error: Can't render headers after they are sent to the client.
at ServerResponse.<anonymous> (http.js:573:11)
at ServerResponse._renderHeaders (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:64:25)
at ServerResponse.writeHead (http.js:813:20)
at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/auth.strategies/facebook.js:28:15
at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:113:13
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/strategyExecutor.js:45:39)
at [object Object].pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:32:3)
at [object Object].halt (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:29:8)
at [object Object].redirect (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/authExecutionScope.js:16:8)
at [object Object].<anonymous> (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/auth.strategies/facebook.js:77:15)
Error: Can't set headers after they are sent.
at ServerResponse.<anonymous> (http.js:527:11)
at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:195:11)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
at param (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:189:13)
at pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:191:10)
at Object.router [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:197:6)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
at Object.auth [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:153:7)
Error: Can't set headers after they are sent.
at ServerResponse.<anonymous> (http.js:527:11)
at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
at param (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:189:13)
at pass (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:191:10)
at Object.router [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/router.js:197:6)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
at Object.auth [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:153:7)
Error: Can't set headers after they are sent.
at ServerResponse.<anonymous> (http.js:527:11)
at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
at Object.auth [as handle] (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect-auth/lib/index.js:153:7)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
at HTTPServer.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:211:3)
at Object.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:105:14)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
Error: Can't set headers after they are sent.
at ServerResponse.<anonymous> (http.js:527:11)
at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:150:23)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
at HTTPServer.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:211:3)
at Object.handle (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:105:14)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:198:15)
at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:323:9
at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:338:9
node.js:134
throw e; // process.nextTick error, or 'error' event on first tick
^
Error: Can't set headers after they are sent.
at ServerResponse.<anonymous> (http.js:527:11)
at ServerResponse.setHeader (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/patch.js:50:20)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:162:13)
at next (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/http.js:207:9)
at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:323:9
at /home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session.js:338:9
at Array.<anonymous> (/home/eugene/public_html/all_things_node/projects/fb2/node_modules/connect/lib/middleware/session/memory.js:57:7)
at EventEmitter._tickCallback (node.js:126:26)
The following is my code:
var fbId= "XXX";
var fbSecret= "XXXXXX";
var fbCallbackAddress= "http://127.0.0.1:8888/auth/facebook_callback"
var cookieSecret = "node"; // enter a random hash for security
var express= require('express');
var auth = require('connect-auth')
var app = express.createServer();
app.configure(function(){
app.use(express.bodyParser());
app.use(express.methodOverride());
app.use(express.cookieParser());
app.use(express.session({secret: cookieSecret}));
app.use(auth([
auth.Facebook({
appId : fbId,
appSecret: fbSecret,
callback: fbCallbackAddress,
scope: 'offline_access,email,user_about_me,user_activities,manage_pages,publish_stream',
failedUri: '/noauth'
})
]));
app.use(app.router);
});
app.get('/auth/facebook', function(req, res) {
req.authenticate("facebook", function(error, authenticated) {
if (authenticated) {
res.redirect("/great");
console.log("ok cool.");
console.log(res['req']['session']);
}
});
});
app.get('/noauth', function(req, res) {
console.log('Authentication Failed');
res.send('Authentication Failed');
});
app.get('/great', function( req, res) {
res.send('Supercoolstuff');
});
app.listen(8888);
May I know what is wrong with my code?

The res object in Express is a subclass of Node.js's http.ServerResponse (read the http.js source). You are allowed to call res.setHeader(name, value) as often as you want until you call res.writeHead(statusCode). After writeHead, the headers are baked in and you can only call res.write(data), and finally res.end(data).
The error "Error: Can't set headers after they are sent." means that you're already in the Body or Finished state, but some function tried to set a header or statusCode. When you see this error, try to look for anything that tries to send a header after some of the body has already been written. For example, look for callbacks that are accidentally called twice, or any error that happens after the body is sent.
In your case, you called res.redirect(), which caused the response to become Finished. Then your code threw an error (res.req is null). and since the error happened within your actual function(req, res, next) (not within a callback), Connect was able to catch it and then tried to send a 500 error page. But since the headers were already sent, Node.js's setHeader threw the error that you saw.
Comprehensive list of Node.js/Express response methods and when they must be called:
Response must be in Head and remains in Head:
res.writeContinue()
res.statusCode = 404
res.setHeader(name, value)
res.getHeader(name)
res.removeHeader(name)
res.header(key[, val]) (Express only)
res.charset = 'utf-8' (Express only; only affects Express-specific methods)
res.contentType(type) (Express only)
Response must be in Head and becomes Body:
res.writeHead(statusCode, [reasonPhrase], [headers])
Response can be in either Head/Body and remains in Body:
res.write(chunk, encoding='utf8')
Response can be in either Head/Body and becomes Finished:
res.end([data], [encoding])
Response can be in either Head/Body and remains in its current state:
res.addTrailers(headers)
Response must be in Head and becomes Finished:
return next([err]) (Connect/Express only)
Any exceptions within middleware function(req, res, next) (Connect/Express only)
res.send(body|status[, headers|status[, status]]) (Express only)
res.attachment(filename) (Express only)
res.sendfile(path[, options[, callback]]) (Express only)
res.json(obj[, headers|status[, status]]) (Express only)
res.redirect(url[, status]) (Express only)
res.cookie(name, val[, options]) (Express only)
res.clearCookie(name[, options]) (Express only)
res.render(view[, options[, fn]]) (Express only)
res.partial(view[, options]) (Express only)

Some of the answers in this Q&A are wrong. The accepted answer is also not very "practical", so I want to post an answer that explains things in simpler terms. My answer will cover 99% of the errors I see posted over and over again. For the actual reasons behind the error take a look at the accepted answer.
HTTP uses a cycle that requires one response per request. When the client sends a request (e.g. POST or GET) the server should only send one response back to it.
This error message:
Error: Can't set headers after they are sent.
usually happens when you send several responses for one request. Make sure the following functions are called only once per request:
res.json()
res.send()
res.redirect()
res.render()
(and a few more that are rarely used, check the accepted answer)
The route callback will not return when these res functions are called. It will continue running until it hits the end of the function or a return statement. If you want to return when sending a response you can do it like so: return res.send().
Take for instance this code:
app.post('/api/route1', function(req, res) {
console.log('this ran');
res.status(200).json({ message: 'ok' });
console.log('this ran too');
res.status(200).json({ message: 'ok' });
}
When a POST request is sent to /api/route1 it will run every line in the callback. A Can't set headers after they are sent error message will be thrown because res.json() is called twice, meaning two responses are sent.
Only one response can be sent per request!
The error in the code sample above was obvious. A more typical problem is when you have several branches:
app.get('/api/company/:companyId', function(req, res) {
const { companyId } = req.params;
Company.findById(companyId).exec((err, company) => {
if (err) {
res.status(500).json(err);
} else if (!company) {
res.status(404).json(); // This runs.
}
res.status(200).json(company); // This runs as well.
});
}
This route with attached callback finds a company in a database. When doing a query for a company that doesn't exist we will get inside the else if branch and send a 404 response. After that, we will continue on to the next statement which also sends a response. Now we have sent two responses and the error message will occur. We can fix this code by making sure we only send one response:
.exec((err, company) => {
if (err) {
res.status(500).json(err);
} else if (!company) {
res.status(404).json(); // Only this runs.
} else {
res.status(200).json(company);
}
});
or by returning when the response is sent:
.exec((err, company) => {
if (err) {
return res.status(500).json(err);
} else if (!company) {
return res.status(404).json(); // Only this runs.
}
return res.status(200).json(company);
});
A big sinner is asynchronous functions. Take the function from this question, for example:
article.save(function(err, doc1) {
if (err) {
res.send(err);
} else {
User.findOneAndUpdate({ _id: req.user._id }, { $push: { article: doc._id } })
.exec(function(err, doc2) {
if (err) res.send(err);
else res.json(doc2); // Will be called second.
})
res.json(doc1); // Will be called first.
}
});
Here we have an asynchronous function (findOneAndUpdate()) in the code sample. If there are no errors (err) findOneAndUpdate() will be called. Because this function is asynchronous the res.json(doc1) will be called immediately. Assume there are no errors in findOneAndUpdate(). The res.json(doc2) in the else will then be called. Two responses have now been sent and the Can't set headers error message occurs.
The fix, in this case, would be to remove the res.json(doc1). To send both docs back to the client the res.json() in the else could be written as res.json({ article: doc1, user: doc2 }).

I ran into this error as well for a while. I think (hope) I've wrapped my head around it, wanted to write it here for reference.
When you add middleware to connect or express (which is built on connect) using the app.use method, you're appending items to Server.prototype.stack in connect (At least with the current npm install connect, which looks quite different from the one github as of this post). When the server gets a request, it iterates over the stack, calling the (request, response, next) method.
The problem is, if in one of the middleware items writes to the response body or headers (it looks like it's either/or for some reason), but doesn't call response.end() and you call next() then as the core Server.prototype.handle method completes, it's going to notice that:
there are no more items in the stack, and/or
that response.headerSent is true.
So, it throws an error. But the error it throws is just this basic response (from the connect http.js source code:
res.statusCode = 404;
res.setHeader('Content-Type', 'text/plain');
res.end('Cannot ' + req.method + ' ' + req.url);
Right there, it's calling res.setHeader('Content-Type', 'text/plain');, which you are likely to have set in your render method, without calling response.end(), something like:
response.setHeader("Content-Type", "text/html");
response.write("<p>Hello World</p>");
The way everything needs to be structured is like this:
Good Middleware
// middleware that does not modify the response body
var doesNotModifyBody = function(request, response, next) {
request.params = {
a: "b"
};
// calls next because it hasn't modified the header
next();
};
// middleware that modify the response body
var doesModifyBody = function(request, response, next) {
response.setHeader("Content-Type", "text/html");
response.write("<p>Hello World</p>");
response.end();
// doesn't call next()
};
app.use(doesNotModifyBody);
app.use(doesModifyBody);
Problematic Middleware
var problemMiddleware = function(request, response, next) {
response.setHeader("Content-Type", "text/html");
response.write("<p>Hello World</p>");
next();
};
The problematic middleware sets the response header without calling response.end() and calls next(), which confuses connect's server.

I had this same issue and realised it was because I was calling res.redirect without a return statement, so the next function was also being called immediately afterwards:
auth.annonymousOnly = function(req, res, next) {
if (req.user) res.redirect('/');
next();
};
Which should have been:
auth.annonymousOnly = function(req, res, next) {
if (req.user) return res.redirect('/');
next();
};

Lots of people hit this error. It's a confusing this with async processing. Most likely some of your code is setting headers in the first tick and then you are running an async callback in a future tick. In between, the response header gets sent, but then further headers (like a 30X redirect) try to add extra headers, but it's too late since the response header has already been transmitted.
I'm not sure exactly what's causing your error, but look at any callbacks as potential areas to investigate.
One easy tip to simplify your code. Get rid of app.configure() and just call app.use directly in your top level scope.
See also the everyauth module, which does Facebook and a dozen or so other 3rd party authentication providers.

This type of error you will get when you pass statements after sending a response.
For example:
res.send("something response");
console.log("jhgfjhgsdhgfsdf");
console.log("sdgsdfhdgfdhgsdf");
res.send("sopmething response");
Will result in the error you are seeing, because once the response has been sent, the following res.send will not be executed.
If you want do anything, you should do it before sending the response.

error find by itself after a RND :
1) my error code :
return res.sendStatus(200).json({ data: result });
2) my success code
return res.status(200).json({ data: result });
the difference is that i used sendStatus() instead of status().

I boiled my head over this issue and it has happened due to a careless mistake on handling the callbacks. non returned callbacks cause the response to be set twice.!
My program had a code which validate request and query the DB. after validating if error is there, I was calling back the index.js with the validation errors .
And if validation passes it goes ahead and hit the db with success/failure.
var error = validateRequestDetails("create",queryReq);
if (error)
callback(error, null);
else
some code
callback(null, success);
What was happening is : Incase validation fails the callback get called and response get set. But not returned. So it still continues the method goes to db and hit success/failure . It calls the same callback again causing the response to be set twice now.
So solution is simple, you need to 'return' the callback so that the method don't continue executing, once the error has occurred and hence set the response object once
var error = validateRequestDetails("create",queryReq);
if (error)
callback(error, null);
return;
else
some code
callback(null, success);

I simply add the return keyword like:
return res.redirect("/great"); and it worked!

This error happens when you send 2 responses. For example :
if(condition A)
{
res.render('Profile', {client:client_});
}
if (condition B){
res.render('Profile', {client:client_});
}
}
Imagine if for some reason condition A and B are true so in the second render you'll get that error

Sometimes you may get this error when you try to call next() function after res.end or res.send , try to delete if you have next() after res.send or res.end in your function.
Note: here next() means after responding to the client with your response(i.e res.send or res.end) you are still trying to execute some code to respond again so it is not legal.
Example :
router.get('/',function (req,res,next){
res.send("request received");
next(); // this will give you the above exception
});
remove next() from above function and it will work.

If you are using callback functions use return after the err block. This is one of the scenarios in which this error can happen.
userModel.createUser(data, function(err, data) {
if(err) {
res.status = 422
res.json(err)
return // without this return the error can happen.
}
return res.json(data)
})
Tested on Node version v10.16.0 and express 4.16.4

there is something else that cause this error and it is when you do not add return keyword in front of res.send, res.json, etc...

Please check if your code is returning multiple res.send() statements for a single request. Like when I had this issue....
I was this issue in my restify node application. The mistake was that
switch (status) {
case -1:
res.send(400);
case 0:
res.send(200);
default:
res.send(500);
}
I was handling various cases using switch without writing break. For those little familiar with switch case know that without break, return keywords. The code under case and next lines of it will be executed no matter what. So even though I want to send single res.send, due to this mistake it was returning multiple res.send statements, which prompted
error: can't set headers after they are sent to the client.
Which got resolved by adding this or using return before each res.send() method like return res.send(200)
switch (status) {
case -1:
res.send(400);
break;
case 0:
res.send(200);
break;
default:
res.send(500);
break;
}

In my case it was a 304 response (caching) that was causing the issue.
Easiest solution:
app.disable('etag');
Alternate solution here if you want more control:
http://vlasenko.org/2011/10/12/expressconnect-static-set-last-modified-to-now-to-avoid-304-not-modified/

For anyone that's coming to this and none of the other solutions helped, in my case this manifested on a route that handled image uploading but didn't handle timeouts, and thus if the upload took too long and timed out, when the callback was fired after the timeout response had been sent, calling res.send() resulted in the crash as the headers were already set to account for the timeout.
This was easily reproduced by setting a very short timeout and hitting the route with a decently-large image, the crash was reproduced every time.

In my case this happened with React and postal.js when I didn't unsubscribe from a channel in the componentWillUnmount callback of my React component.

Just leaned this. You can pass the responses through this function:
app.use(function(req,res,next){
var _send = res.send;
var sent = false;
res.send = function(data){
if(sent) return;
_send.bind(res)(data);
sent = true;
};
next();
});

This happens when response was delivered to client and again you are trying to give response. You have to check in your code that somewhere you are returning response to client again which causes this error. Check and return response once when you want to return.

Please search if in your app.get to not set status before res.send("your result");
I just removed :
res.sendStatus(200);
and response works after that !!!
res.send("your result");

A newer version of Node supports res.headersSent boolean expression. You can use it to validate whether you already sent a response:
if (!res.headersSent) // if doesn't sent yet
res.status(200).send({ "message": "This is a message" })
Note! Although this works and answers the question, it's not the right way to solve the problem, and is not recommended!
Sending a response more than once indicates that you have a problem in your code that should be fixed (It's the same as using two return statements, one after another, in your function. it's a bug).

Add this middlware and it will work
app.use(function(req,res,next){
var _send = res.send;
var sent = false;
res.send = function(data){
if(sent) return;
_send.bind(res)(data);
sent = true;
};
next();
});

If you din't get help from above : for noobs
The reason behind this error is sending request multiple times let us understand from some cases:-
1. `
module.exports = (req,res,next)=>{
try{
const decoded = jwt.verify(req.body.token,"secret");
req.userData = decoded;
next();
}catch(error){
return res.status(401).json({message:'Auth failed'});
}
next();
}
`
in the above calling next() twice will raise an error
router.delete('/:orderId', (req, res, next) => {
Order.remove({_id:req.params.orderId},(err,data)=>{
if(err){
**res.status(500).json(err);**
}else{
res.status(200).json(data);
}
*res.status(200).json(data);*
})
})
here respond is send twice check whether you already sent a response

It is very likely that this is more of a node thing, 99% of the time it's a double callback causing you to respond twice, or next()ing twice etc, damn sure. It solved my problem was using next() inside a loop. Remove the next() from the loop or stop calling it more than one times.

If you uses two of res.end() function in one api call, this error shows
for example
app.post("/auth", function (request, res) {
var username = request.body.username;
var password = request.body.password;
if (username && password) {
let sql =
"SELECT username, worker_name, worker_surname, id FROM workers where username = ? AND password=?";
con.query(sql, [username, password], function (error, results, fields) {
if (results.length > 0) {
res.status(200).send(results);
res.end();
}
res.status(404).send("Incorrect Username and/or Password!");
});
} else {
res.send("Please enter Username and Password!");
}
res.end();
});

sometimes only writing
res.status(200).json({success: 'user authenticated');
is not enough.
For hours , i found we have to return return response sometimes.
Like this
return res.status(200).json({success: 'user authenticated');
so that It can terminate whenever in some conditional statement and doesn't run other .

The problem was exist from /auth/facebook route to make things ease to understand, once that you sent a response already from the client, you must NOT set any other functions below for next successor block, it is also related on being Synchronous of JavaScript,
for deep understanding, it is looks like this code;
async function getRequest(){
let data = await API.get();
return data;
let json = data.json(); // will not read this line
}
on your case, console.log("ok cool."); and console.log(res['req']['session']) must be put before res.redirect("/great")
Hope it make sense, Welcome :)

I had the same issue. For me i had 2 res.json(event) was giving this error to me.
res.json(savedEvent);
res.json({ event });
We should pass only single response will work.
res.json(event);

I got a similar error when I tried to send response within a loop function. The simple solution was to move the
res.send('send response');
out of the loop since you can only send response header once.
https://www.tutorialspoint.com/nodejs/nodejs_response_object.htm

Check your code. For me, I used res.status twice in the same if statement. First one set the header status and the second one tried to change it, which caused the problem.

How do you properly stop execution of an express.js endpoint?

I have a middleware error handler that is working great but next(err) and return and return next(err) seems to not stop execution when dealing with promises. What is the proper way to stop execution of my code when an error is found?
For reference: err is a standard Error class in this case.
I don't think you need the code in userProvider.fetchFriends to help with this but if that's wrong please let me know.
const uid = req.query.steamUserId;
//Use the userProvider to get steam friend data
const friendData = await userProvider.fetchFriends(uid)
.catch(err => {
return next(err); //Does not stop execution. Why? just next(err) doesn't either.
});
//Putting this after every catch works but seems very stupid. How do I avoid this?
if(res.writableEnded)
return;
...Other code that runs but causes errors
}

You've got two problems here.
First: next() is explicitly continuing to the next middleware or endpoint.
To finish dealing with the request, send a response.
const middleware = (req, res, next) => {
if (something(req)) {
next();
} else {
res.status(500).json({ ok: false, msg: "some error message" });
}
}
Second: You need to watch your asynchronous logic carefully.
You can't:
trigger something asynchronous
send a response
send a different response when the asynchronous function is complete
You can only send one response to a request.
Either:
Don't call next or res.something in the catch block and just log the error internally or
Don't call next or res.something outside the promise handling and move it to a then handler instead (you might want to switch to using async/await to make your logic easier to follow)

The issue was that I was mixing async/await with .then/.catch. Needed to use try/catch.
ty #jonsharpe
export const getSteamFriends = async (req, res, next) => {
try{
const uid = req.query.steamUserId;
//Use the userProvider to get steam friend data
const friendData = await userProvider.fetchFriends(uid);
//more code in the middle
} catch(e) {
return next(e);
}
};

Conditionally Sending Response in Catch Block

I'm trying to figure out the proper way to handle a potential bad Fetch response. If the Fetch response is not okay, I want to immediately send a 500 response and and stop the rest of the code from executing. But if the response is okay, I want to continue the program and send a response at the end. My code does seem to work properly at the moment but I get
UnhandledPromiseRejectionWarning: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client.
I assume this is because program continues after the catch block and tries to send the second response. Again, the code works but this is obviously not the right way to do it. Is there way I can get the program to stop executing after the response in the catch block is sent?
app.get('/route', async function(req, res){
try{
let response = await fetch('https://www.google.com/NonExistantPage')
if(!response.ok)
throw new Error("err")
}catch{
res.status(500).end()
}
/*
Program continues if fetch was successful
*/
res.send("data")
})

Your code is trying to call the res.send("data") even though it sets the response when error occurs inside catch res.status(500).end(). Try returning the response to break the execution of the final response once the response headers are set inside catch as shown below
app.get('/route', async function(req, res){
try{
let response = await fetch('https://www.google.com/NonExistantPage')
if(!response.ok)
throw new Error("err")
}catch{
return res.status(500).end()
}
/*
Program continues if fetch was successful
*/
return res.send("data")
})

try-catch is async so don't need to set async function. I use this:
app.get('/route',(req, res)=>{
try
{
let response = await fetch('https://www.google.com/NonExistantPage')
if(!response.ok) {
throw new Error("err")
}
}
catch (err)
{
/* handle errors */
}
finally
{
res.status("status code")
// send data and other things ...
res.send("data")
return.end()
}
})

Returning Error Values Through Axios/Express To React App

I've got a handleSubmit function that fetches data from my backend as part of a larger component. I'd like to send the error information to my redux store and/or local component when the back-end fails, but am unable to do so.
The handleSubmit function looks like this (it's using React hooks, which are wired up correctly. Can post the full component if that is useful):
const handleSubmit = async (e, { dataSource, filter, filterTarget }) => {
e.preventDefault();
setIsLoading(true);
setErrorValue(null);
setError(false);
const token = localStorage.JWT_TOKEN;
const link = filterTarget === "Identifier" ? `http://localhost:8081/api/${dataSource}/${filter}`: `http://localhost:8081/api/${dataSource}?filter=${filter}&filterTarget=${filterTarget}`;
try {
let data = await axios.get(link, { headers: { authorization: token }});
props.setData(data);
setError(false);
setIsLoading(false);
} catch (err){
setErrorValue(err.message);
setError(true);
setIsLoading(false);
};
};
I'm intentionally making bad requests through the form, which will trigger an error in my backend. These are handled through my custom Express middleware function, which looks like this (I'll add more once I get this framework to work):
handleOtherError: (error, req, res, next) => { // Final custom error handler, with no conditions. No need to call next() here.
console.log("This error handler is firing!");
return res.status(500).json({
message: error.message,
type: "ServerError"
});
}
I know that this function is firing because the console.log statement is appearing on my server, and if I change the status code, so does the status code error on the front-end in my Google Chrome console.
In fact, if I go to the network tab, the correct error information appears for my request. Here's the video of me making a bad request:
However, when I try to access the err.message on my front-end, I'm not able to do so. The err.message in my try/catch handler for the handleSubmit function only ever gives me the Request failed with status code XXX
What am I doing wrong?

See https://github.com/axios/axios#handling-errors
You can access the response by using err.response.data.message, not err.message.

Found the answer posted elsewhere: https://github.com/axios/axios/issues/960
Apparently, to get the message, you have to use err.response.data.message
Simply using "err" will only give you a basic string respresentation of the error.