Getting contacts from google people api - javascript

const express = require('express'),
bodyParser = require('body-parser'),
Sequelize = require('sequelize')
const app=express()
app.use(bodyParser.json())
var google = require('googleapis');
var contacts = google.people('v1');
const nconf = require('nconf');
const readline = require('readline');
const plus = google.plus('v1');
const path = require('path');
const OAuth2Client = google.auth.OAuth2;
nconf.argv().env().file(path.join(__dirname, '/oauth2.keys.json'));
const keys = nconf.get('web');
const CLIENT_ID = '1058912681476-uat19si2uli37vlehs2avqfue2l0b6ku.apps.googleusercontent.com';
const CLIENT_SECRET = 'PbY8AVICTQsywb4qiqCJ8gMB';
const REDIRECT_URL = 'urn:ietf:wg:oauth:2.0:oob';
const oauth2Client = new OAuth2Client(CLIENT_ID, CLIENT_SECRET, REDIRECT_URL);
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
function getAccessToken (oauth2Client, callback) {
// generate consent page url
const url = oauth2Client.generateAuthUrl({
access_type: 'offline', // will return a refresh token
scope: 'https://www.googleapis.com/auth/plus.me' // can be a space-delimited string or an array of scopes
});
console.log('Visit the url: ', url);
rl.question('Enter the code here:', code => {
// request access token
oauth2Client.getToken(code, (err, tokens) => {
if (err) {
return callback(err);
}
// set tokens to the client
// TODO: tokens should be set by OAuth2 client.
oauth2Client.credentials=tokens;
callback();
});
});
}
// retrieve an access token
getAccessToken(oauth2Client, () => {
// retrieve user profile
plus.people.get({ userId: 'me', auth: oauth2Client }, (err, profile) => {
if (err) {
throw err;
}
console.log(profile.displayName, ':', profile.tagline);
});
});
//here-not working
contacts.people.connections.list({
auth: oauth2Client //authetication object generated in step-3
}, function (err, response) {
// handle err and response
if(err){
throw err;
}
console.log(response.names);
});
app.listen(8080)
I'm trying to get the contacts of an user from the google people api(https://developers.google.com/people/api/rest/v1/people.connections/list) but when I try to call contacts.people.connection.list() I get Error:
Missing required parameters: resourceName
at Object.createAPIRequest (/home/ubuntu/workspace/contactmanager/backend/node_modules/googleapis/build/src/lib/apirequest.js:94:18);

The error says it all. The resourceName is a required parameter. If you look in the people.connections.list you must provide a 'people/me' value as parameter. Other values are invalid.
GET https://people.googleapis.com/v1/{resourceName=people/me}/connections

#noogui already answered the reason . Here is the more elaborative code for the use case:
function listConnectionNames(auth) {
const service = google.people({
version: "v1",
auth
});
service.people.connections.list({
resourceName: "people/me",
pageSize: 10,
personFields: "names,emailAddresses"
},
(err, res) => {
if (err) return console.error("The API returned an error: " + err);
const connections = res.data.connections;
if (connections) {
console.log("Connections:");
connections.forEach(person => {
if (person.names && person.names.length > 0) {
console.log(person.names[0].displayName);
} else {
console.log("No display name found for connection.");
}
});
} else {
console.log("No connections found.");
}
}
);
}

Related

There is some issue when I try to get data from mongodb by node.js?

This is my index.js. When I hit my API using postman, there is a bug in my getdata() method code that causes it to return the else statement rather than finding the requested resource. I'm not sure why the data targeting by ID can't be found. When I use console.log to test my code, the try statement is entered but did not find anything from the database and catch statement is returned.
const connectToMongo = require('./db');
var cors = require('cors');
const express = require('express');
const bodyParser = require('body-parser');
const photo = require('./models/photoModel');
const formidable = require('formidable');
const fs = require('fs');
const photoModel = require('./models/photoModel');
connectToMongo();
const app = express();
app.use(cors());
const port = 5000;
//app.use(express.json());
app.use(bodyParser.json());
const userData = (req, res) => {
const form = new formidable.IncomingForm();
console.log('1');
form.parse(req, (err, fields, file) => {
console.log('2');
if (fields) {
console.log('3');
const { email, mno, name } = fields;
if (!email || !mno || !name) {
console.log('4');
return res.status(400).json({
error: 'Fill all the fields',
});
}
}
if (file.photo) {
if (file.photo.size > 4000000) {
return res.status(400).json({
error: 'image size is too long',
});
}
const user = new photo(fields);
user.photo.data = fs.readFileSync(file.photo.filepath);
user.photo.contentType = file.photo.type;
user.save((err, user) => {
if (err) {
return res.status(400).json({
error: 'Not save in db',
});
}
console.log('above json');
res.json(user);
});
}
});
};
// The issue is here
const getdata = async (req, res) => {
try {
console.log('yes');
const photo = await photo.find({ photo: req.photo.id });
res.json(photo);
} catch (error) {
return res.status(400).json({
error: 'not find',
});
}
};
//router
app.post('/userdashboard', userData);
app.get('/getdata', getdata);
app.listen(port, () => {
console.log(`Dashboard Backend listening on port ${port}`);
});
This is my modelschema
const mongoose = require('mongoose');
const { Schema } = mongoose;
const PhotoSchema = new Schema({
name:{
type:String,
trim:true,
required:true
},
email:{
type:String,
trim:true,
required:true
},
photo:{
data:Buffer,
contentType:String
},
mno:{
type:Number,
required:true
}
});
module.exports=mongoose.model('photo',PhotoSchema);
First mistake you did was not adding console.error(error), if you did it would have shown exact error message.
In this case req.photo is undefined and you are trying to access id property of undefined which causes error to be thrown.
const getdata = async (req, res) => {
try {
const { photo } = req.body
// TODO: use custom error class for validation errors instead of default Error class
if (!photo) throw new Error('photo is missing')
if (!photo.id) throw new Error('photo.id is missing')
// TODO: validate photo.id is valid monogoid
const photos = await photo.find({ photo: photo.id })
res.json(photos)
} catch (error) {
console.error(error) // <-- this was missing
res.status(400).json({ error: 'not find' }) // provide good error message
return
}
}

Google oAuth2 UnhandledPromiseRejectionWarning: Error: No refresh token is set

This below is my auth.js route code to login via oAuth2 and it was working till this afternoon, now tonight started to throw error UnhandledPromiseRejectionWarning: Error: No refresh token is set.
const express = require("express");
const google = require('googleapis').google;
const jwt = require('jsonwebtoken');
const CONFIG = require("../config/passport-google");
const nf = require('node-fetch');
const gUser = require('../models/User-g');
const router = express.Router();
// Google's OAuth2 client
const OAuth2 = google.auth.OAuth2;
router.get("/youtube", function(req, res) {
// Create an OAuth2 client object from the credentials in our config file
const oauth2Client = new OAuth2(
CONFIG.oauth2Credentials.client_id,
CONFIG.oauth2Credentials.client_secret,
CONFIG.oauth2Credentials.redirect_uris[0]
);
// Obtain the google login link to which we'll send our users to give us access
const loginLink = oauth2Client.generateAuthUrl({
access_type: "offline", // Indicates that we need to be able to access data continously without the user constantly giving us consent
scope: CONFIG.oauth2Credentials.scopes // Using the access scopes from our config file
});
return res.render("./home/g-login", { loginLink: loginLink });
});
router.get("/youtube/callback", function(req, res) {
// Create an OAuth2 client object from the credentials in our config file
const oauth2Client = new OAuth2(
CONFIG.oauth2Credentials.client_id,
CONFIG.oauth2Credentials.client_secret,
CONFIG.oauth2Credentials.redirect_uris[0]
);
if (req.query.error) {
// The user did not give us permission.
return res.redirect("/");
} else {
oauth2Client.getToken(req.query.code, function(err, token) {
if (err) return res.redirect("/");
// Store the credentials given by google into a jsonwebtoken in a cookie called 'jwt'
res.cookie("jwt", jwt.sign(token, CONFIG.JWTsecret));
// return res.redirect("/get_some_data");
if (!req.cookies.jwt) {
// We haven't logged in
return res.redirect("/");
}
// Add this specific user's credentials to our OAuth2 client
oauth2Client.credentials = jwt.verify(req.cookies.jwt, CONFIG.JWTsecret);
// Get the youtube service
const service = google.youtube("v3");
const url = `https://www.googleapis.com/oauth2/v1/userinfo?access_token=${token[Object.keys(token)[0]]}`;
const get_data = async () => {
try {
const response = await nf(url);
const json = await response.json();
// save user to db
async (json, done) => {
const newUser = {
channelId: json.id,
channelEmail: json.email,
image: json.picture,
createdAt: Date.now()
}
try {
let user = await gUser.findOne({ channelId: json.id });
if(user){
done(null, user);
} else {
user = await gUser.create(newUser);
done(null, user);
}
} catch (err) {
console.log(err);
return res.redirect("../../500");
}
}
return json;
} catch (err) {
console.log(err);
return res.redirect("../../500");
}
};
// Get 50 of the user's subscriptions (the channels they're subscribed to)
service.subscriptions
.list({
auth: oauth2Client,
mine: true,
part: "snippet,contentDetails",
maxResults: 50
})
.then(async (response) => {
//.then(response => {
const diomerda = await get_data();
// Render the profile view, passing the subscriptions to it
return res.render("./user/dashboard", { subscriptions: response.data.items, diomerda: diomerda });
});
});
}
});
// Logout from Google
router.get('/logout', (req, res) => {
req.logout();
res.redirect('/');
})
module.exports = router;
I tried to delete the app from the authorized apps inside my google account im using to test, and when i test the login again it now goes through all the steps of the login, it asks for permit, i accept twice and then it throws that error and the page looks like frozen in a loop

sockiet.ion passport.js, express.js and authentication headers

My chrome extension was working perfectly until recently.
I originally received a error message of
required same site none and secure in the header
I then added to my express.session config,
samesite:none, secure:true
Now instead of that error, I am unable to gain access to my website by login in with my chrome extension, which I believe is due to socket.io not maintaining the authentication cookie.
My express server is as below,
const config = require('../../config');
const express = require('express');
const app = express();
const server = require('http').createServer(app);
const io = require('socket.io')(server, { wsEngine: 'ws' });
const mysql = require('mysql');
const expressSession = require('express-session');
const ExpressMysqlSessionStore = require('express-mysql-session')(expressSession);
const sharedsession = require('express-socket.io-session');
const path = require('path');
const utils = require('./utils');
// remove from header "X-Powered-By: Express"
app.disable('x-powered-by');
server.listen(config.serverParams.port, config.serverParams.address, () => {
console.log(`Server running at http://${server.address().address}:${server.address().port}`);
});
/* DATABASE */
global.db = mysql.createConnection(config.db);
db.connect();
/* DATABASE */
/* SESSION */
const sessionStore = new ExpressMysqlSessionStore(config.sessionStore, db);
const session = expressSession({
...config.session,
store: sessionStore,
});
app.use(session);
/* SESSION */
app.use(express.static(config.frontendDir));
app.get([
'/signup',
'/stats',
'/pay',
], (req, res) => res.sendFile(path.join(`${config.frontendDir}${req.path}.html`)));
io.use(sharedsession(session, {
autoSave: true
}));
io.on('connection', socket => {
socket.use((packet, next) => {
if (packet[0]) {
console.log('METHOD:', packet[0]);
const sessionData = socket.handshake.session.user;
const noSessionNeed = [ 'login', 'signup', 'checkAuth' ].includes(packet[0]);
let error;
if ( ! sessionData && ! noSessionNeed) error = { code: -1, message: 'You need to login in extension!' };
if (error) return next(new Error(JSON.stringify(error)));
else next();
}
});
const auth = require('./auth')(socket);
socket.on('checkAuth', auth.checkAuth);
socket.on('login', auth.login);
socket.on('signup', auth.signup);
socket.on('logout', auth.logout);
const users = require('./users')(socket);
socket.on('users.get', users.get);
const sentiment = require('./sentiment')(socket);
socket.on('sentiment.get', sentiment.get);
socket.on('sentiment.set', sentiment.set);
socket.on('disconnect', () => {
});
});
And the config file is somewhat like this,
config.session = {
// globals.config.express.sessionSecret
resave: true,
saveUninitialized: true,
cookie: {
maxAge: 86400000,
/* FOR WORK ON LOCALHOST
secure: true,
sameSite: 'lax', */
sameSite:"None",
secure:true,
domain: '.xx.xx',
},
Here is how the authentication is done with the socket.io
const passport = require('passport');
/* PASSPORT */
require('./passport')(passport); // pass passport for configuration
/* app.use(passport.initialize());
app.use(passport.session()); */
/* PASSPORT */
const utils = require('./utils');
const bcrypt = require('bcrypt');
const saltRounds = 10;
module.exports = socket => {
this.checkAuth = fn => {
if (fn) fn();
};
this.login = (params, fn) => {
passport.authenticate('local-login', (err, user) => {
const response = {};
if (user) {
socket.handshake.session.user = user;
socket.handshake.session.save();
response.message = 'Your successful login!';
response.data = {
id: user.id,
username: user.username,
};
}
else if (err) {
response.error = {
code: err,
message: ''
};
if (err == -1) response.error.message = 'Incorrect username or password!';
}
if (fn) fn(response);
})({ body: params });
},
// socket.on('signup', (params, fn) => {
this.signup = (params, fn) => {
passport.authenticate('local-signup', (err, user) => {
const response = {};
if (user) {
console.log('signup', user);
response.message = 'Your successful signup!';
}
else if (err) {
response.error = {
code: err,
message: ''
};
if (err == -1) response.error.message = 'User alreay exist!';
}
if (fn) fn(response);
})({ body: params });
};
// socket.on('logout', fn => {
this.logout = fn => {
delete socket.handshake.session.user;
};
return this;
};
utils
module.exports = socket => {
// socket.on('users.get', fn => {
this.get = fn => {
if (fn) {
const response = {};
response.data = {
id: socket.handshake.session.user.id,
username: socket.handshake.session.user.username,
};
fn(response);
}
};
return this;
};
Would love to be able to solve this issue :P
Thanks!
This was solved by using a JWT token, separate from this, to solve the issue of the socket.io session.s
Maybe it has to do with the signup function? I think there's no sign up option for first-comers. Try making if (user) -> if (!user)

how can i use db.collection() outside of mongodb.connect() [duplicate]

I've been reading and reading and still am confused on what is the best way to share the same database (MongoDb) connection across whole NodeJs app. As I understand connection should be open when app starts and reused between modules. My current idea of the best way is that server.js (main file where everything starts) connects to database and creates object variable that is passed to modules. Once connected this variable will be used by modules code as necessary and this connection stays open. E.g.:
var MongoClient = require('mongodb').MongoClient;
var mongo = {}; // this is passed to modules and code
MongoClient.connect("mongodb://localhost:27017/marankings", function(err, db) {
if (!err) {
console.log("We are connected");
// these tables will be passed to modules as part of mongo object
mongo.dbUsers = db.collection("users");
mongo.dbDisciplines = db.collection("disciplines");
console.log("aaa " + users.getAll()); // displays object and this can be used from inside modules
} else
console.log(err);
});
var users = new(require("./models/user"))(app, mongo);
console.log("bbb " + users.getAll()); // not connected at the very first time so displays undefined
then another module models/user looks like that:
Users = function(app, mongo) {
Users.prototype.addUser = function() {
console.log("add user");
}
Users.prototype.getAll = function() {
return "all users " + mongo.dbUsers;
}
}
module.exports = Users;
Now I have horrible feeling that this is wrong so are there any obvious problems with this approach and if so how to make it better?
You can create a mongoUtil.js module that has functions to both connect to mongo and return a mongo db instance:
const MongoClient = require( 'mongodb' ).MongoClient;
const url = "mongodb://localhost:27017";
var _db;
module.exports = {
connectToServer: function( callback ) {
MongoClient.connect( url, { useNewUrlParser: true }, function( err, client ) {
_db = client.db('test_db');
return callback( err );
} );
},
getDb: function() {
return _db;
}
};
To use it, you would do this in your app.js:
var mongoUtil = require( 'mongoUtil' );
mongoUtil.connectToServer( function( err, client ) {
if (err) console.log(err);
// start the rest of your app here
} );
And then, when you need access to mongo somewhere else, like in another .js file, you can do this:
var mongoUtil = require( 'mongoUtil' );
var db = mongoUtil.getDb();
db.collection( 'users' ).find();
The reason this works is that in node, when modules are require'd, they only get loaded/sourced once so you will only ever end up with one instance of _db and mongoUtil.getDb() will always return that same instance.
Note, code not tested.
There are many ways this could be tweaked to accept configuration objects in places, but overall it's similar to how you have your code laid out, albeit with more modern JS syntax. Could easily be rewritten to prototypes and callbacks, if that's your requirement.
mongo.js
const { MongoClient } = require('mongodb');
const config = require('./config');
const Users = require('./Users');
const conf = config.get('mongodb');
class MongoBot {
constructor() {
const url = `mongodb://${conf.hosts.join(',')}`;
this.client = new MongoClient(url, conf.opts);
}
async init() {
await this.client.connect();
console.log('connected');
this.db = this.client.db(conf.db);
this.Users = new Users(this.db);
}
}
module.exports = new MongoBot();
Users.js
class User {
constructor(db) {
this.collection = db.collection('users');
}
async addUser(user) {
const newUser = await this.collection.insertOne(user);
return newUser;
}
}
module.exports = User;
app.js
const mongo = require('./mongo');
async function start() {
// other app startup stuff...
await mongo.init();
// other app startup stuff...
}
start();
someFile.js
const { Users } = require('./mongo');
async function someFunction(userInfo) {
const user = await Users.addUser(userInfo);
return user;
}
Here's how I do it with contemporary syntax, based on go-oleg's example. Mine is tested and functional.
I put some comments in the code.
./db/mongodb.js
const MongoClient = require('mongodb').MongoClient
const uri = 'mongodb://user:password#localhost:27017/dbName'
let _db
const connectDB = async (callback) => {
try {
MongoClient.connect(uri, (err, db) => {
_db = db
return callback(err)
})
} catch (e) {
throw e
}
}
const getDB = () => _db
const disconnectDB = () => _db.close()
module.exports = { connectDB, getDB, disconnectDB }
./index.js
// Load MongoDB utils
const MongoDB = require('./db/mongodb')
// Load queries & mutations
const Users = require('./users')
// Improve debugging
process.on('unhandledRejection', (reason, p) => {
console.log('Unhandled Rejection at:', p, 'reason:', reason)
})
const seedUser = {
name: 'Bob Alice',
email: 'test#dev.null',
bonusSetting: true
}
// Connect to MongoDB and put server instantiation code inside
// because we start the connection first
MongoDB.connectDB(async (err) => {
if (err) throw err
// Load db & collections
const db = MongoDB.getDB()
const users = db.collection('users')
try {
// Run some sample operations
// and pass users collection into models
const newUser = await Users.createUser(users, seedUser)
const listUsers = await Users.getUsers(users)
const findUser = await Users.findUserById(users, newUser._id)
console.log('CREATE USER')
console.log(newUser)
console.log('GET ALL USERS')
console.log(listUsers)
console.log('FIND USER')
console.log(findUser)
} catch (e) {
throw e
}
const desired = true
if (desired) {
// Use disconnectDB for clean driver disconnect
MongoDB.disconnectDB()
process.exit(0)
}
// Server code anywhere above here inside connectDB()
})
./users/index.js
const ObjectID = require('mongodb').ObjectID
// Notice how the users collection is passed into the models
const createUser = async (users, user) => {
try {
const results = await users.insertOne(user)
return results.ops[0]
} catch (e) {
throw e
}
}
const getUsers = async (users) => {
try {
const results = await users.find().toArray()
return results
} catch (e) {
throw e
}
}
const findUserById = async (users, id) => {
try {
if (!ObjectID.isValid(id)) throw 'Invalid MongoDB ID.'
const results = await users.findOne(ObjectID(id))
return results
} catch (e) {
throw e
}
}
// Export garbage as methods on the Users object
module.exports = { createUser, getUsers, findUserById }
If you are using Express, then you can use mongo-express-req module that allows you to get db connection in request object.
Install
npm install --save mongo-express-req
server.js
var app = require('express')();
var mongoExpressReq = require('mongo-express-req');
app.use(mongoExpressReq('mongodb://localhost/test'));
routes/users.js
app.get('/', function (req, res, next) {
req.db // => Db object
});
Note: mongo-express-req is fork of not maintained express-mongo-db.
A tested solution based on the accepted answer:
mongodbutil.js:
var MongoClient = require( 'mongodb' ).MongoClient;
var _db;
module.exports = {
connectToServer: function( callback ) {
MongoClient.connect( "<connection string>", function( err, client ) {
_db = client.db("<database name>");
return callback( err );
} );
},
getDb: function() {
return _db;
}
};
app.js:
var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var app = express();
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
var mongodbutil = require( './mongodbutil' );
mongodbutil.connectToServer( function( err ) {
//app goes online once this callback occurs
var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var companiesRouter = require('./routes/companies');
var activitiesRouter = require('./routes/activities');
var registerRouter = require('./routes/register');
app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/companies', companiesRouter);
app.use('/activities', activitiesRouter);
app.use('/register', registerRouter);
// catch 404 and forward to error handler
app.use(function(req, res, next) {
next(createError(404));
});
// error handler
app.use(function(err, req, res, next) {
res.locals.message = err.message;
res.locals.error = req.app.get('env') === 'development' ? err : {};
res.status(err.status || 500);
res.render('error');
});
//end of calback
});
module.exports = app;
activities.js -- a route:
var express = require('express');
var router = express.Router();
var mongodbutil = require( '../mongodbutil' );
var db = mongodbutil.getDb();
router.get('/', (req, res, next) => {
db.collection('activities').find().toArray((err, results) => {
if (err) return console.log(err)
res.render('activities', {activities: results, title: "Activities"})
});
});
router.post('/', (req, res) => {
db.collection('activities').save(req.body, (err, result) => {
if (err) return console.log(err)
res.redirect('/activities')
})
});
module.exports = router;
Here is my setup in 2020:
./utils/database.js
const { MongoClient } = require('mongodb');
class Mongo {
constructor () {
this.client = new MongoClient("mongodb://127.0.0.1:27017/my-app", {
useNewUrlParser: true,
useUnifiedTopology: true
});
}
async main () {
await this.client.connect();
console.log('Connected to MongoDB');
this.db = this.client.db();
}
}
module.exports = new Mongo();
/app.js
const mongo = require('./utils/database');
const express = require('express');
const app = express();
const boot = async () => {
await mongo.main();
app.listen(3000);
};
boot();
go-oleg is basically right, but in these days you (probably) dont want use "mongodb" itself, rather use some framework, which will do a lot of "dirty work" for you.
For example, mongoose is one of the most common. This is what we have in our initial server.js file :
const mongoose = require('mongoose');
const options = {server: {socketOptions: {keepAlive: 1}}};
mongoose.connect(config.db, options);
This is everything what is needed to set it up. Now use this anywhere in your code
const mongoose = require('mongoose');
And you get that instance you set up with mongoose.connect
I´m late to the party, but hopefully this answer will help someone, this is a functional code:
db.js
const MongoClient = require("mongodb").MongoClient
const urlMongo = "mongodb://localhost:27017"
var db;
function connectToServer( callback ) {
MongoClient.connect(urlMongo, { useUnifiedTopology: true , useNewUrlParser: true }, function( err, client ) {
db = client.db('auth');
return callback( err );
})
}
function getDb() {
return db
}
module.exports = {connectToServer, getDb}
We export one function to connect to the mongo and another to get de instanceof the connection.
app.js
const express = require('express')
const app = express()
const mongo = require('./db.js');
mongo.connectToServer( function( err) {
if (err) console.log(err);
const auth = require('./modulos')
app.post('/login', (req, res) => { auth.login(req, res)})
app.listen(3000, function () { console.log('Corriendo en puerto 3000')})
});
We must do the require of the auth module after we initiallize the connection, otherwise the getDb function will return undefined.
module.js
const db = require('../db.js').getDb()
const usuariosCollection = db.collection('usuarios')
function login(req, res){
usuariosCollection.find({ 'username': 'Fran' }).toArray(function (err, doc) {
...
})
}
As this is tagged with Express, I thought I would mention that Express has a built in feature to share data between routes. There is an object called app.locals. We can attach properties to it and access it from inside our routes. You simply instantiate your mongo connection in your app.js file.
var app = express();
MongoClient.connect('mongodb://localhost:27017/')
.then(client =>{
const db = client.db('your-db');
const collection = db.collection('your-collection');
app.locals.collection = collection;
});
// view engine setup
app.set('views', path.join(__dirname, 'views'));
This database connection can now be accessed within your routes as below without the need for creating and requiring additional modules.
app.get('/', (req, res) => {
const collection = req.app.locals.collection;
collection.find({}).toArray()
.then(response => res.status(200).json(response))
.catch(error => console.error(error));
});
This method ensures that you have a database connection open for the duration of your app unless you choose to close it at any time. It's easily accessible with req.app.locals.your-collection and doesn't require additional modules.
Initialize the connection as a promise:
const MongoClient = require('mongodb').MongoClient
const uri = 'mongodb://...'
const client = new MongoClient(uri)
const connection = client.connect() // initialized connection
And then call the connection whenever you wish you perform an action on the database:
// if I want to insert into the database...
const connect = connection
connect.then(() => {
const doc = { id: 3 }
const db = client.db('database_name')
const coll = db.collection('collection_name')
coll.insertOne(doc, (err, result) => {
if(err) throw err
})
})
Here's a suggestion using TypeScript and ES6 features and syntax:
db.ts
import { Db, MongoClient } from 'mongodb'
let client: MongoClient
let db: Db
const connectToDatabase = async () => {
client = new MongoClient('databaseURI')
await client.connect()
db = client.db('dbname')
}
export {
connectToDatabase,
client,
db,
}
index.ts
import express from 'express'
import { someRouter } from './routes/someRoute'
import { connectToDatabase } from './db'
connectToDatabase().then(() => {
const app = express()
app.use('/someRoute', someRouter)
const port = process.env.PORT || 5000
app.listen(port, () => {
console.log(`Server is listening on port ${port}`)
})
})
routes/someRoute.ts
import express from 'express'
import { db } from '../db'
const someRouter = express.Router()
someRouter.route('/')
.get(async (req, res) => {
const results = await db.collection('collectionName').find().toArray()
return res.send(results)
})
export {
someRouter,
}
we can create a dbconnection file like dbconnection.js
const MongoClient = require('mongodb').MongoClient
const mongo_url = process.env.MONGO_URL;
module.exports = {
connect: async function(callback) {
var connection;
await new Promise((resolve, reject) => {
MongoClient.connect(mongo_url, {
useNewUrlParser: true
}, (err, database) => {
if (err)
reject();
else {
connection = database;
resolve();
}
});
});
return connection;
}
};
and then use this file in the your app like
var connection = require('../dbconnection');
and then use like this inside your async function
db = await connection.connect();
hope this will work
I find this works well :)
mongoUtil.ts
import { MongoClient } from 'mongodb';
const uri =
'MONGOSTRING';
let connPoolPromise: any = null;
const mongoPoolPromise = () => {
if (connPoolPromise) return connPoolPromise;
connPoolPromise = new Promise((resolve, reject) => {
const conn = new MongoClient(uri, {
useNewUrlParser: true,
useUnifiedTopology: true,
});
if (conn.isConnected()) {
return resolve(conn);
} else {
conn
.connect()
.then(() => {
return resolve(conn.db('DATABASENAME'));
})
.catch(err => {
console.log(err);
reject(err);
});
}
});
return connPoolPromise;
};
export = {
mongoPoolPromise,
};
anyFile.ts
const { mongoPoolPromise } = require('./mongoUtil');
async function getProducts() {
const db = await mongoPoolPromise();
const data = await db
.collection('myCollection')
.find({})
.toArray();
console.log(data);
return data;
}
export { getProducts };
I'm a bit late for this, but I'll add my solution too. It's a much noobier approach compared to the answers here.
Anyway if you are using MongoDB version 4.0 and Node.js 3.0 (or higher versions) you can use isConnected() function from the MongoClient.
const MongoClient = require('mongodb').MongoClient;
const uri = "<your connection url>";
const client = new MongoClient(uri, { useNewUrlParser: true });
if (client.isConnected()) {
execute();
} else {
client.connect().then(function () {
execute();
});
}
function execute() {
// Do anything here
// Ex: client.db("mydb").collection("mycol");
}
This worked fine for me. Hope it helps.
Based on accepted answers, I use a simple approach. But use this only if you want to use db inside function which will be executed after some time. For ex: In express route functions, it is the easiest approach you can take.
mongo.js
const MongoClient = require("mongodb").MongoClient
var db
const connectDb = (callback) => {
if (db) return callback()
MongoClient.connect( uri, {ops},
(err, database) => {
if (err) return console.log(err)
db = database.db("dbName")
console.log("Database Connected")
callback()
}
)
}
const getDb = (collectionToGet) => {
return db.collection(collectionToGet)
}
module.exports = {
connectDb,
getDb,
}
Now, in other files where you want the db object,
user.js
const { connectDb, getDb } = require('mongo.js')
var db // store db object in this object
connectDb(() => ( db = getDb("user") ))
app.get('/', (req, res) => {
// do something with req
db.insert({})
// do something with res
}
If you opt for using mongoose in your application edit your app.js file with the following snippet
app.js
const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/Your_Data_Base_Name', {useNewUrlParser:true})
.then((res) => {
console.log(' ########### Connected to mongDB ###########');
})
.catch((err) => {
console.log('Error in connecting to mongoDb' + err);
});`
Next Step:
Define Models for your application require them and perform CRUD operation directly for example
blogSchema.js
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const blogSchema = new Schema({
_id : mongoose.Schema.Types.ObjectId,
title : {
type : 'String',
unique : true,
required : true
},
description : String,
comments : [{type : mongoose.Schema.Types.ObjectId, ref: 'Comment'}]
});
module.exports = mongoose.model('Blog', blogSchema);
Usage
createBlog.js
const Blog = require('../models/blogSchema');
exports.createBlog = (req, res, next) => {
const blog = new Blog({
_id : new mongoose.Types.ObjectId,
title : req.body.title,
description : req.body.description,
});
blog.save((err, blog) => {
if(err){
console.log('Server Error save fun failed');
res.status(500).json({
msg : "Error occured on server side",
err : err
})
}else{
//do something....
}
U don't need to connect to mogoDB always ....
var MongoClient = require('mongodb').MongoClient;
var url = 'mongodb://localhost:27017/';
var Pro1;
module.exports = {
DBConnection:async function()
{
Pro1 = new Promise(async function(resolve,reject){
MongoClient.connect(url, { useNewUrlParser: true },function(err, db) {
if (err) throw err;
resolve(db);
});
});
},
getDB:async function(Blockchain , Context)
{
bc = Blockchain;
contx = Context;
Pro1.then(function(_db)
{
var dbo = _db.db('dbname');
dbo.collection('collectionname').find().limit(1).skip(0).toArray(function(err,result) {
if (err) throw err;
console.log(result);
});
});
},
closeDB:async function()
{
Pro1.then(function(_db){
_db.close();
});
}
};
const express = require('express')
const server = express()
const mongoClient = require('./MongoDB.js').client
const port = 3000
;(async () => {
await mongoClient.connect()
server.listen(port, () => console.log(`Server is listening on port ${port}!`))
})().catch(console.error)
You can use the Singleton Design Pattern to achive cross file usage of your MongoDB connection.
Init.mjs
/* ################ Controller ################ */
import ctrlLib from '../../controller/lib.mjs';
/* ################ MongoDB ################ */
import mongodb from 'mongodb';
/* ################ Logs ################ */
import log from 'fancy-log';
import chalk from 'chalk';
/** Init MongoDB connection */
export class Init {
/**
* Check if its first time usage of this class.
If true set class instance to this that we always get same instance.
* Then get MongoDB details from config.yml and set as global.
* In the last step we return the class instance.
*/
constructor() {
if (Init.instance == null) Init.instance = this;
const config = ctrlLib.getConfig();
this.MongoURL = config.MongoDB.url;
this.MongoName = config.MongoDB.dbname;
({MongoClient: this.MongoClient} = mongodb);
return Init.instance;
}; // constructor(){
/** Connect to Database and return connection */
async connect() {
try {
const client = await this.MongoClient.connect(
this.MongoURL, {useNewUrlParser: true, useUnifiedTopology: true},
);
this.connection = {'db': client.db(this.MongoName), 'client': client};
return this.connection;
} // try {
catch (e) {
log( `${chalk.red.bold('❌ ERROR')} while try to connect to MongoDB DB
${chalk.white.bold('Error:\n')} ${e}` );
} // catch (e) {
}; // async connect() {
/**
* Return connection for cross file usage
* #return {object}
*/
getConnection() {return this.connection;};
}; // export class Init {
app.mjs
Make sure to 1x time create your MongoDB connection anywhere inside of your project that you can use it later in other files.
/* ################ Services ################ */
import {Init} from './Init.mjs';
(async ()=>{
await new Init().connect();
})().catch(e=>{log('app.mjs - Catch error: ' + e);});
anyOtherFile.mjs
/* ################ Services ################ */
import {Init} from './Init.mjs';
/** Subclass of Search which contains lib functions */
class Lib {
/**
* Find data by using search query and return result.
* #param {string} collection - Name of collection
* #param {object} query - Search query
*/
async findOne(collection, query) {
const connection = new Init().getConnection();
return await connection.db.collection(collection).findOne(query);
}; // async findOne() {
}; // class Lib {
Updated for 2022 MongoClient new updates
MongoUtil.js (For database connection and return database instance)
const { MongoClient } = require('mongodb');
const uri = "your database connection url";
var _db;
module.exports = {
connectToServer: function (callback) {
MongoClient.connect(uri, { useNewUrlParser: true }, function (err, client) {
_db = client.db('testdb');
return callback(err);
});
},
getDb: function () { //this returns database instance
return _db;
}
};
app.js (You can use in any routes or js by importing mongoUtil)
var mongoUtil = require('./mongoUtil');
mongoUtil.connectToServer(function (err, client) {
if (err) console.log(err);
console.log(`server is running`);
insertData(); //or do functions and db queries in any js
});
async function insertData() { //Functions should be async
var database = mongoUtil.getDb();
var movies = database.collection('movies');
const doc = {
title: "Movie title",
content: "Movie content",
}
const result = await movies.insertOne(doc);
console.log(`A document was inserted with the _id: ${result.insertedId}`);
}
I tried #go-oleg answer and it works pretty well. Inside getDb() , I make sure _db must be defined. And if not defined, I call the connectToServer() so that it will get defined again. After this I don't have to call connectToServer() in the app.js which makes my code clean.
let getDb = async() => {
if(_db) {
return _db
} else {
_db = await connectToServer()
return _db
}
}
And then, I simply call getDb() everywhere. Also, What I observed, It takes about 64ms on first call. After first call it takes about, 2-6ms everytime.
I answered here because i have less reputation to comment.
all after long effort my working by this operational method:
Please follow this link this is also good solution:
https://mrvautin.com/re-use-mongodb-database-connection-in-routes/
Folks, in 2022 there is no need for reconnection logic, the Node.js MongoDB driver handles this all for you (v4+).
You can simply connect as described in the official docs. Put this in a db.js file, then you can import client or db anywhere in your app:
import { MongoClient, ServerApiVersion } from 'mongodb'
const uri = `mongodb+srv://...`;
// Create a new MongoClient
export const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true, serverApi: ServerApiVersion.v1 });
export const db = client.db('your_db');
When making queries, use try/catch to capture potential connection errors.
try {
const res = await db.collection("testdata").insertOne({test: Math.random()});
console.log('Inserted', res);
} catch(e) {
console.error('MONGO ERROR', e);
}
AFAIK, the Mongo driver will keep retrying forever if the connection is lost.
Try it yourself: put the above code in a setInterval and turn off your internet connection for a while then turn it back on, Mongo will automatically reconnect, even after hours of downtime. It will even submit some queries that were made while the connection was down.
Updated for 2023
MongoDB Connection
const { MongoClient, ServerApiVersion } = require('mongodb');
const dbconfig = require('./config');
module.exports = {
client: client = new MongoClient(dbconfig.uri, { useNewUrlParser: true, useUnifiedTopology: true, serverApi: ServerApiVersion.v1 }),
connectToDB: async () => {
try {
await client.connect()
console.log('connected!')
} catch (err) {
console.log('Err', err)
}
}
}
In your controller
const db = require('../config/mongodb.connection')
const hha_data = db.client.db('hha-sit').collection('hnh-data')
exports.addNewCustomer = async (req, res) => {
try {
await db.connectToDB()
let result = await hha_data.findOne({}, { account_id: 'MDB829001337' })
console.log('result', result)
} catch (err) {
console.error('Connection Error !', err)
} finally {
await db.client.close()
}
res.send('Hi')
}
Please feel free to revise it if you have any suggestions. :)
This approach is correct, and it can be improved in the following ways:
1.Wrap the MongoClient connect function inside a module and export it as a singleton object to be used across your application. This way, you can make sure only one connection is established to the MongoDB server and is reused across your modules.
2.Add error handling to your code to handle potential issues like a connection failure.
3.Use the MongoDB native driver's connection pooling feature instead of maintaining a single connection throughout the application's lifetime, as this can lead to resource exhaustion and poor performance.
This is an example of a improved implementation:
const MongoClient = require('mongodb').MongoClient;
let _db;
const connectToDb = async (url) => {
if (db) return db;
let client;
try {
client = await MongoClient.connect(url, {
useNewUrlParser: true,
useUnifiedTopology: true
});
_db = client.db();
} catch (err) {
console.error('Error connecting to MongoDB: ', err);
process.exit(1);
}
return _db;
};
module.exports = connectToDb;
const connectToDb = require('./db');
const userModule = async (app) => {
const db = await connectToDb('mongodb://localhost:27017/marankings');
return {
addUser: () => console.log('add user'),
getAll: () => 'all users'
};
};
module.exports = userModule;
const userModule = require('./userModule');
(async () => {
const users = await userModule();
console.log(users.getAll());
})();

The Google Slides API Node.Js request is misssing valid authentication credential

I've been getting this error:
Expected OAuth 2 access token, login cookie or other valid authentication credential
whenever I run my program. Here is my code.
const fs = require('fs');
const readline = require('readline');
const {google} = require('googleapis');
const promise = require('promise');
const slides = google.slides({
version: 'v1',
auth: 'CLIENT_SECRET'
});
const SCOPES = ['https://www.googleapis.com/auth/presentations', 'https://www.googleapis.com/auth/drive', 'https://www.googleapis.com/auth/drive.file', 'https://www.googleapis.com/auth/drive.appdata', 'https://www.googleapis.com/auth/plus.me', 'https://www.googleapis.com/auth/userinfo.profile', 'https://www.googleapis.com/auth/userinfo.email'];
const TOKEN_PATH = 'token.json';
fs.readFile('credentials.json', (err, content) => {
if (err) return console.log('Error loading client secret file:', err);
authorize(JSON.parse(content), createSlide);
});
function authorize(credentials, callback) {
const {client_secret, client_id, redirect_uris} = credentials.installed;
const oAuth2Client = new google.auth.OAuth2(
client_id, client_secret, redirect_uris[0]
);
fs.readFile(TOKEN_PATH, (err, token) => {
if (err) return getNewToken(oAuth2Client, callback);
oAuth2Client.setCredentials(JSON.parse(token));
callback(oAuth2Client);
});
}
function getNewToken(oAuth2Client, callback) {
const authUrl = oAuth2Client.generateAuthUrl({
access_type: 'offline',
scope: SCOPES,
});
console.log('Authorize this app by visiting this url:', authUrl);
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout,
});
rl.question('Enter the code from that page here: ', (code) => {
rl.close();
oAuth2Client.getToken(code, (err, token) => {
if (err) return console.error('Error retrieving access token', err);
oAuth2Client.setCredentials(token);
fs.writeFile(TOKEN_PATH, JSON.stringify(token), (err) => {
if (err) console.error(err);
console.log('Token stored to', TOKEN_PATH);
});
callback(oAuth2Client);
});
});
}
function createSlide(presentationId, pageId, auth) {
return new Promise((resolve, reject) => {
let requests = [{
createSlide: {
objectId: pageId,
insertionIndex: '1',
slideLayoutReference: {
predefinedLayout: 'TITLE_AND_TWO_COLUMNS',
},
},
}];
//ELEMENTS
slides.presentations.batchUpdate({
presentationId,
resource: {
requests,
},
}, (err, res) => {
if (err) return console.log("Error: " + err);
console.log(`Created slide with ID: ${res.replies[0].createSlide.objectId}`);
resolve(res);
});
});
}
The code is from the node.js quickstart (https://developers.google.com/slides/quickstart/nodejs).
The function createSlide() is from the Github Node.Js snippets (https://github.com/gsuitedevs/node-samples/blob/master/slides/snippets/snippets.js#L78)
I have tried the code on the Github for the Google APIs Node.js Client (https://github.com/googleapis/google-api-nodejs-client)
I am fairly new to the Google API and Node.Js, so I'm still learning about async and promise. Can someone tell me what I am doing wrong, and perhaps provide a full working example (not snippets)? Thanks in advance!

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