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cannot set headers after they are sent to the client nodejs

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Splendid Skimmer answered on April 22, 2022 Popularity 10/10 Helpfulness 3/10

answer cannot set headers after they are sent to the client nodejs

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cannot set headers after they are sent to the client nodejs

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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().

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: stackoverflow.com

Tags: client javascript set

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Contributed on Apr 22 2022

Splendid Skimmer

0 Answers Avg Quality 2/10

Closely Related Answers

Cannot set headers after they are sent to the client

Comment

app.get('/a', (req, res) => {
  res.send('Hello World!');
  // ⛔️ Calling send method twice
  res.send('Hello World!');
});

app.get('/b', (req, res) => {
  res.setHeader('Content-Type', 'application/json');
  res.send('Hello World!');
  // ⛔️ Setting headers after response has been sent
  res.setHeader('Content-Type', 'text/html');
});

app.get('/c', (req, res) => {
  // ⛔️ Using both send and redirect in a single request
  res.send('Hello World!!!');
  res.redirect('/articles');
});

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: bobbyhadz.com

Tags: client cl

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Contributed on Jul 13 2022

freelance developer

0 Answers Avg Quality 2/10

Cannot set headers after they are sent to the client at new NodeError

Comment

const http = require('http');

const server = http.createServer((req, res) => {
  // Setting headers
  res.setHeader('Content-Type', 'text/plain');

  // Simulating some processing delay
  setTimeout(() => {
    // Sending the response
    res.statusCode = 200;
    res.end('Hello, world!');
  }, 1000);
});

// Start the server
server.listen(3000, () => {
  console.log('Server is running on port 3000');
});

Popularity 9/10 Helpfulness 2/10 Language javascript

Source: Grepper

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Contributed on Sep 11 2023

YOU.com

0 Answers Avg Quality 2/10

cannot set headers after they are sent to the client

Comment

Error: can't set headers after they are sent.
this error happen when you send multiple response .

for example :-


var express = require('express');
var router = express.Router();
const Jwt= require('jsonwebtoken');
const jwtKey='e-comm'

/* GET login. */
let testName='test';
let testEmail='test@gmail.com';
router.get('/', function(req, res, next) {
    console.log("req",req.body)
const {name,email}=req.body;
    if(name==testName && email==testEmail){
        let token=Jwt.sign({name,email},jwtKey,{expiresIn:'1h'});
        res.json({										
            success:true,
            token
        })
    }
  res.send('login page');
});

module.exports = router;

in above example i send two types so i get error remove the last one response 


var express = require('express');
var router = express.Router();
const Jwt= require('jsonwebtoken');
const jwtKey='e-comm'

/* GET login. */
let testName='test';
let testEmail='test@gmail.com';
router.get('/', function(req, res, next) {
    console.log("req",req.body)
const {name,email}=req.body;
    if(name==testName && email==testEmail){
        let token=Jwt.sign({name,email},jwtKey,{expiresIn:'1h'});
        res.json({										
            success:true,
            token
        })
    }
  
});

module.exports = router;

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: client cl

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Contributed on Aug 12 2022

Grotesque Goat

0 Answers Avg Quality 2/10

Cannot set headers after they are sent to the client

Comment

if (req.body.password !== originalPassword) {
  res.status(401).json("Wrong credentials!");
  return;
}

Popularity 10/10 Helpfulness 2/10 Language whatever

Source: stackoverflow.com

Tags: client cl

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Contributed on Jul 13 2022

freelance developer

0 Answers Avg Quality 2/10

cannot set headers after they are sent to the client

Comment

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().

Popularity 10/10 Helpfulness 1/10 Language javascript

Source: Grepper

Tags: client cl

Link to this answer
Share Copy Link

Contributed on Sep 03 2022

DevEmdad

0 Answers Avg Quality 2/10

cannot set headers after they are sent to the client nodejs

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