Develop Reference

Vonage Sms Api Implementation at Node js

I try to use sms provider at node js to send sms to users but I have a problem at this point
I try so :
const { Vonage } = require('#vonage/server-sdk');
const vonage = new Vonage({
apiKey: 'VONAGE_API_KEY',
apiSecret: 'VONAGE_API_SECRET'
});
var recipient = 'TO_NUMBER';
vonage.message.sendSms(sender, recipient, message, (err, responseData) => {
if (err) {
console.log(err);
} else {
if (responseData.messages[0]["status"] === "0") {
console.dir(responseData);
} else {
console.log(
`Message failed with error: ${responseData.messages[0]["error-text"]}`
);
}
}
}
)
But I get this error:
TypeError: Cannot read properties of undefined (reading 'sendSms')

Trouble solving: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client

I'm working on a simple web app using node-pg and express.js with a login page and a dashboard that displays some data from a database.
The dashboard and all it's data loads fine initially using the following function after the user inputs their username and password:
const queryLogin = (request, response) => {
var username = request.body.username;
var password = request.body.password;
if (username && password) {
Promise.all([
pool.query('SELECT * FROM jobdesc WHERE complete=0 AND customer=$1 ORDER BY date_rec ASC LIMIT 10', ['somecustomer']),
pool.query('SELECT * FROM accounts WHERE email=$1 AND password=$2', [username, password],)
]).then(function([orderResults, results]) {
if (results.rows.length > 0) {
request.session.loggedin = true;
request.session.username = username;
var user = username;
var orderObj = orderResults.rows;
if (results.rows[0].account_type == 1) {
request.session.account_type = 1;
response.render('pages/index');
} else if (results.rows[0].account_type == 0) {
request.session.account_type = 0;
response.render('pages/dashboard', {
user: user,
orderObj: orderObj
});
} else {
console.log("Invalid Account Type");
}
} else {
response.send('Incorrect Username and/or Password!');
}
response.end();
}, function(error) {
throw error;
});
} else {
response.send('Please enter Username and Password!');
response.end();
}
}
The issue is that I have a link in my navbar that redirects to the dashboard (in the case that the user navigates to a different page and wants to return to the home page). When pressed I get the following error: Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
The route I use to try and redirect to the home page is: app.get('/home', con.launchDashboard)
And the code for the function is:
const launchDashboard = (request, response) => {
if (request.session.loggedin) {
Promise.all([
pool.query('SELECT * FROM jobdesc WHERE complete=0 AND customer=$1 ORDER BY date_rec ASC LIMIT 10', ['somecustomer'])
]).then(function([orderResults]) {
if (request.session.account_type == 1) {
return response.render('pages/index');
}
else if (request.session.account_type == 0) {
var user = request.session.username;
var orderObj = orderResults.rows;
return response.render('pages/dashboard', {
orderObj: orderObj,
user: user
});
}
})
} else {
response.render('pages/login');
}
response.end();
}
I'm unsure of why I am getting this error, I am confused with where I am setting headers after they are sent to the client.

Trying to query aws s3 object Using AWS query with select

Below is the piece of code i have written , to get the result but null in response
I am using selectObjectContent api to get the results with the simple SQL query
const bucket = 'myBucketname'
const key = 'file.json.gz'
const query = "SELECT * FROM s3object "
const params = {
Bucket: bucket,
Key: key,
ExpressionType: "SQL",
Expression: query,
InputSerialization: {
CompressionType: "GZIP",
JSON: {
Type: "LINES"
},
},
OutputSerialization: {
JSON: {
RecordDelimiter: ","
}
}
}
s3.selectObjectContent(params,(err, data) => {
if (err) {
console.log(data)
} else {
console.log(err)
}
})

I have found the solution to it. was logging error when getting successfull result/data , so corrected it below. Also i have found the way to read stream buffer data
s3.selectObjectContent(params,(err, data) => {
if (err) {
console.log(err)
} else {
console.log(data)
}
})
const eventStream = data.Payload;
// Read events as they are available
eventStream.on('data', (event) => {
if (event.Records) {
// event.Records.Payload is a buffer containing
// a single record, partial records, or multiple records
var records = event.Records.Payload.toString();
console.log( records )
} else if (event.Stats) {
console.log(`Processed ${event.Stats.Details.BytesProcessed} bytes`);
} else if (event.End) {
console.log('SelectObjectContent completed');
}

How to fix "Error: Can't set headers after they are sent" in Express

I have recently been developing a MERN application and I have recently came into the trouble that express is saying that I am setting headers after they are sent.
I am using mongo db and trying to update a user profile.
I have tried to comment out my res.send points to find the issue but I have failed to do so.
Here is my post method for updating the user profile:
app.post("/api/account/update", (req, res) => {
const { body } = req;
// Validating and Checking Email
if (body.email) {
var email = body.email;
email = email.toLowerCase();
email = email.trim();
body.email = email;
User.find(
{
email: body.email
},
(err, previousUsers) => {
if (previousUsers.length > 0) {
return res.send({
success: false,
message:
"Error: There is already another account with that email address"
});
} else {
}
}
);
}
// Validating Names Function
function checkName(name) {
var alphaExp = /^[a-zA-Z]+$/;
if (!name.match(alphaExp)) {
return res.send({
success: false,
message: "Error: Names cannot contain special characters or numbers"
});
}
}
checkName(body.firstName);
checkName(body.lastName);
// Making sure that all fields cannot be empty
if (!body.email && !body.firstName && !body.lastName) {
return res.send({
success: false,
message: "Error: You cannot submit nothing"
});
}
// Getting User ID from the current session
UserSession.findById(body.tokenID, function(err, userData) {
// Finding User ID using the current users session token
if (userData.isDeleted) {
return res.send({
success: false,
message:
"Error: Session token is no longer valid, please login to recieve a new one"
});
}
// Deleting the token ID from the body object as user table entry doesnt store tokens
delete body.tokenID;
// Finding the user profile and updating fields that are present
User.findByIdAndUpdate(userData.userId, body, function(err, userInfo) {
if (!err) {
return res.send({
success: true,
message: "Success: User was updated successfully"
});
}
});
});
});
This is the call that I am doing to the backend of the site:
onUpdateProfile: function(fieldsObj) {
return new Promise(function(resolve, reject) {
// Get Session Token
const obj = getFromStorage("the_main_app");
// Defining what fields are getting updated
fieldsObj.tokenID = obj.token;
// Post request to backend
fetch("/api/account/update", {
method: "POST",
headers: {
"Content-Type": "application/json"
},
body: JSON.stringify(fieldsObj)
})
.then(res => {
console.log("Verify Token - Res");
return res.json();
})
.then(json => {
console.log("Verify Token JSON", json);
if (json.success) {
window.location.href = `/manage-account?success=${json.success}`;
} else {
window.location.href = `/manage-account?success=${json.success}`;
}
});
});
}
Here is my error message that I am getting:
Error: Can't set headers after they are sent.
at validateHeader (_http_outgoing.js:491:11)
at ServerResponse.setHeader (_http_outgoing.js:498:3)
at ServerResponse.header (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:767:10)
at ServerResponse.send (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:170:12)
at ServerResponse.json (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:267:15)
at ServerResponse.send (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\express\lib\response.js:158:21)
at C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\routes\api\account.js:270:22
at C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\mongoose\lib\model.js:4641:16
at process.nextTick (C:\Users\kieran.corkin\Desktop\Projects\Mern Template Final\mern-cra-and-server\server\node_modules\mongoose\lib\query.js:2624:28)
at _combinedTickCallback (internal/process/next_tick.js:131:7)
at process._tickCallback (internal/process/next_tick.js:180:9)
[nodemon] app crashed - waiting for file changes before starting...
Can anyone help me with this?
EDIT
I have changed my code, this seems to now work however I feel like its a little messy when put together. Any refactoring tips?
Code:
app.post("/api/account/update", (req, res) => {
// Preform checks on data that is passed through
const { body } = req;
var messages = {
ExistedUser:
"Error: There is already another account with that email address",
NameFormat: "Error: Names cannot contain special characters or numbers",
BlankInputs: "Error: You cannot submit nothing",
accountLoggedOut:
"Error: Session token is no longer valid, please login to recieve a new one",
successfullyUpdated: "Success: User was updated successfully"
};
var usersFound;
if (body.email) {
var email = body.email;
email = email.toLowerCase();
email = email.trim();
body.email = email;
User.find(
{
email: body.email
},
(err, UserCount) => {
usersFound = UserCount;
}
);
}
function capitalize(text) {
return text.replace(/\b\w/g, function(m) {
return m.toUpperCase();
});
}
if (body.firstName) {
body.firstName = capitalize(body.firstName);
}
if (body.lastName) {
body.lastName = capitalize(body.lastName);
}
//Making sure that all fields cannot be empty
if (!body.email && !body.firstName && !body.lastName) {
return res.send({
success: false,
message: messages.BlankInputs
});
}
// Getting User ID from the current session
UserSession.findById(body.tokenID, function(err, userData) {
// Finding User ID using the current users session token
if (userData.isDeleted) {
return res.end({
success: false,
message: messages.accountLoggedOut
});
}
if (userData) {
// Deleting the token ID from the body object as user table entry doesnt store tokens
delete body.tokenID;
// Finding the user profile and updating fields that are present
User.findByIdAndUpdate(userData.userId, body, function(err, userInfo) {
if (userInfo) {
if (!usersFound.length > 0) {
return res.send({
success: true,
message: messages.successfullyUpdated
});
} else {
return res.send({
success: false,
message: messages.ExistedUser
});
}
}
});
}
});
});

You're calling res.send() twice. res.send() ends the process. You ought to refactor such that you call res.write() and only call res.send() when you're done.
This StackOverflow link describes the difference in more detail. What is the difference between res.send and res.write in express?

I believe this is happening, as you're trying to send a response after the first / initial response has already been sent to the browser. For example:
checkName(body.firstName);
checkName(body.lastName);
Running this function twice is going to try and yield 2 different "response" messages.
The product of a single route, should ultimately be a single response.

Thanks for all your help on this issue.
Here is my final code that allowed it to work.
I have also tried to "refactor" it too. Let me know if you'd do something else.
app.post("/api/account/update", (req, res) => {
const { body } = req;
console.log(body, "Logged body");
// Defining objects to be used at the end of request
var updateUserInfo = {
userInfo: {},
sessionToken: body.tokenID
};
var hasErrors = {
errors: {}
};
// Checking that there is at least one value to update
if (!body.email && !body.firstName && !body.lastName) {
var blankError = {
success: false,
message: "Error: You cannot change your details to nothing"
};
hasErrors.errors = { ...hasErrors.errors, ...blankError };
} else {
console.log("Normal Body", body);
clean(body);
console.log("Cleaned Body", body);
updateUserInfo.userInfo = body;
delete updateUserInfo.userInfo.tokenID;
}
// Function to check if object is empty
function isEmpty(obj) {
if (Object.keys(obj).length === 0) {
return true;
} else {
return false;
}
}
// Function to remove objects from body if blank
function clean(obj) {
for (var propName in obj) {
if (obj[propName] === "" || obj[propName] === null) {
delete obj[propName];
}
}
}
// Checking and Formatting Names Given
function capitalize(text) {
return text.replace(/\b\w/g, function(m) {
return m.toUpperCase();
});
}
if (body.firstName) {
body.firstName = capitalize(body.firstName);
}
if (body.lastName) {
body.lastName = capitalize(body.lastName);
}
// Checking and formatting email
if (body.email) {
body.email = body.email.toLowerCase();
body.email = body.email.trim();
// Checking for email in database
User.find({ email: body.email }, (err, EmailsFound) => {
if (EmailsFound.length > 0) {
var EmailsFoundErr = {
success: false,
message: "There is already an account with that email address"
};
hasErrors.errors = { ...hasErrors.errors, ...EmailsFoundErr };
}
});
}
// Getting User Session Token
UserSession.findById(updateUserInfo.sessionToken, function(err, userData) {
// Finding User ID using the current users session token
if (userData.isDeleted) {
var userDeletedError = {
success: false,
message:
"Your account is currently logged out, you must login to change account details"
};
hasErrors.errors = { ...hasErrors.errors, ...userDeletedError };
} else {
// Finding the user profile and updating fields that are present
User.findByIdAndUpdate(
userData.userId,
updateUserInfo.userInfo,
function(err, userInfo) {
// userInfo varable contains user db entry
if (err) {
var updateUserError = {
success: false,
message: "Error: Server Error"
};
hasErrors.errors = {
...hasErrors.errors,
...updateUserError
};
}
if (isEmpty(hasErrors.errors)) {
res.send({
success: true,
message: "Success: You have updated your profile!"
});
} else {
res.send({
success: false,
message: hasErrors.errors
});
}
}
);
}
});
});

Exporting Mysql Connection in nodeJS

In my database.js I have
var Mysql = require('Mysql');
var Jwt = require('jsonwebtoken');
var bcrypt = require('bcrypt');
var supersecretkey = 'JMDub_Super_Secret_key';
var config = require('./config');
var signupErrors = require('./Signuperrors.js');
var sucessMsg = require('./SucessMessages.js');
var App_errors = require('./error.js');
var query = require('./queryDB.js');
var connection = Mysql.createConnection({
"host": "******",
"user": "****",
"password": "***",
"database": "***"
});
connection.connect(function(err) {
if (err) {
console.error('error connecting: ' + err.stack);
return;
}
console.log('connected as id ' + connection.threadId);
});
//Sign Up Methods
var createUser = function createwithCredentails(post,callback) {
bcrypt.hash(post.password, 10, function(err, hash){
//console.log('Cache Hash : +',hash);
var createUserQuery = connection.query('INSERT INTO users SET ?',{"email":post.email,"password":hash,"username":post.username},function(err,result){
if (err) {
if (err.code == 'ER_DUP_ENTRY') {
//console.log(err.code);
callback(signupErrors.error_5000);
}
else callback(App_errors.error_1003);
}
if (result) {
callback(sucessMsg.success_signup);
}
});
});
}
//connection.query('SELECT * FROM Users Where Username = '' AND Password = ''');
var validateUser = function ValidateUserWithUserNameAndPassword(post,callback) {
var UserCheckQuery = connection.query('SELECT * FROM users WHERE email="'+post.email+'"',function(err, results, fields) {
if (err){
console.log(err);
callback(App_errors.error_1000);
}
if (results.length == 1) {
//console.log(results[0].password,post.password);
var givenPassword = post.password;
var DBhash = results[0].password;
bcrypt.compare(givenPassword, DBhash,function(err, res) {
if (res) {
console.log('Password matched');
var token = Jwt.sign({"email":post.email,"username":post.username},supersecretkey, {
expiresIn: 60*60*5 // expires in 5 hours
});
callback({
message:{
"success":1,
"description":"sucessfully logged in - please cache the token for any queries in future",
"environment":"test",
"errorCode":null
},
"token":token
});
}
if (!res) {
console.log('password doesnt match');
callback(signupErrors.error_6000);
}
if (err) {
console.log('Error Comparing Passwords');
callback(App_errors.error_1004);
}
});
}
else{
callback(signupErrors.error_6000);
}
});
};
var isauthenticate = function isauthenticated(post,route,callback) {
if (post.headers.token) {
Jwt.verify(post.headers.token, supersecretkey, function(err, decoded) {
if (decoded) {
//console.log(decoded);
//From this part the user is Sucessully Authenticated and autherization params can be extracted from token if required
//Write Business Logic in future as per the requirement
//Operation 1 - Update Profile
//Profile Details consists of {1.first name 2.last name 3. profile pictur(base 64 encoded) 4.further settings in future that can be added to DB if required}
if (route == '/update-profile') {
query.updateProfile(connection,decoded.email,post.body,function(response) {
callback(response);
});
}
//callback({"message":"is a valid token"});
}
if (decoded == null) {
console.log('is not a valid token');
//callback(App_errors.error_1000);
}
if (err) {
console.log('error verifying token');
callback(App_errors.error_1000);
}
});
}
else{
callback(App_errors.error_1001);
}
};
module.exports = {
validateUser:validateUser,
createUser:createUser,
isauthenticate:isauthenticate,
connection:connection
}
I am exporting connection object to queryDB.js file. But when I try to log the exported connection object I get undefined object. Why is this happening?
When I pass connection object as function argument, everything works fine. Not sure why?
below is queryDB.js file
var errors = require('./error.js')
var Dbconnection = require('./Database.js').connection;
var updateProfile = function profiledata(connection,email,data,callback) {
console.log(Dbconnection);
if ((!data)|| (Object.keys(data).length < 1)) {
//console.log(data);
callback(errors.error_1001);
}
else{
callback({"message":"update Sucesss"});
//console.log(connection);
//var updateData = mapProfileDataTomodel(data);
//console.log(updateData);
connection.query('SELECT * FROM users WHERE email = "'+email+'"',function(err, result,feilds) {
if (err) throw err;
if (result) {
console.log(result);
}
});
}
}
var mapProfileDataTomodel = function mapProfileDataTomodel(data) {
var profileDataModel = {};
for (var key in data) {
//console.log('looping and mapping data');
if (data.firstname) {
profileDataModel.firstname = data.firstname;
}
if (data.lastname) {
profileDataModel.lastname = data.lastname;
}
if (data.profilepic) {
profileDataModel.profilepic = data.profilepic;
}
}
return profileDataModel;
}
module.exports = {
updateProfile:updateProfile
}
I have commented out connection object log via function arguments.
So, Why I am unable to get the connection object that is exported? But I used the same exported connection object in my app.js file. It did work fine there.