I m new to mongoDB, and I try to return a value from a search:
function verifyUser(username) {
var nrs = 0;
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
MongoClient.connect(url, function(err, db) {
if(err) throw err;
var dbo = db.db("numbers");
dbo.collection("numbers").find({ name: username }).toArray(function(err, res){
if(err) throw err;
console.log(res.length);
db.close();
})
});}
verifyUser("test");
I have one record with the name 'test';
But when I try to prove it is not working:
console.log(verifyUser("test") === 1);
I tried to return instead of console.log but it doesn't work.
I am working on a task with different modules.
I require a common mongodb connection for each and every module..
How can I write in some module and use in this because the db connection is also required in some other modules...
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
var dbo;
MongoClient.connect(url, function(err, db) {
if (err) throw err;
dbo = db.db("mydb");
});
router.post('/', function(req, res) {
dbo.collection("customers").find({"userid":req.body.userid}).toArray(function(err, result) {
if (err) throw err;
if(result.length>0){
res.send("username already taken please enter differnt username ")
}
else if(req.body.fname==undefined||(!validator.isAlpha(req.body.fname))){
res.send("please enter only alphabets as fname ")
}
else if(req.body.lname==undefined||(!validator.isAlpha(req.body.lname))){
res.send("please enter only alphabets as lname ")
}
else if(req.body.userid==undefined||(!validator.isAlphanumeric(req.body.userid))){
res.send("please enter only alphanemric as user name ")
}
else if(req.body.pwd==undefined||req.body.pwd.length<6){
res.send("please enter atleast 6 charcaters as password ")
}
else{
var bcrypt = require('bcryptjs');
var salt = bcrypt.genSaltSync(10);
var hash = bcrypt.hashSync(req.body.pwd, salt);
req.body.pwd=hash;
dbo.collection("customers").insertOne(req.body, function(err, res) {
if (err) throw err;
console.log("1 document inserted");
});
res.send(req.body);
}
});
});
module.exports = router;
use can use node export and import, to that you can use mongodb connection instance in other modules also,
assuming dbo is variable where you want to store mongodb connection
export let dbo;
MongoClient.connect(url, function(err, db) {
if (err) throw err;
dbo = db.db("mydb");
});
you can assign db connection to dbo variable and and use it in whichever module you want
you have to create a middleware for your connection and then assign the db object to your request object ( req in your case )
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
router.use( (req,res,next) => {
MongoClient.connect(url, function(err, db) {
if (err) throw err;
req.dbo = db.db("mydb");
next();
});
})
in your router.post("/", ...) you will do req.dbo.collection(...)
var MongoClient = require('mongodb').MongoClient;
var url = "mongodb://localhost:27017/";
var dbo=null;
exports.conection=function(){
if(dbo!=null) return
MongoClient.connect(url, function(err, db) {
if (err) throw err;
dbo = db.db("mydb");
});
}
exports.get = function (){
return dbo;
}
i tried this and i use get method when ever i require this is working for me
How do I connect to mongodb with node.js?
I have the node-mongodb-native driver.
There's apparently 0 documentation.
Is it something like this?
var mongo = require('mongodb/lib/mongodb');
var Db= new mongo.Db( dbname, new mongo.Server( 'mongolab.com', 27017, {}), {});
Where do I put the username and the password?
Also how do I insert something?
Thanks.
Per the source:
After connecting:
Db.authenticate(user, password, function(err, res) {
// callback
});
Everyone should use this source link:
http://mongodb.github.com/node-mongodb-native/contents.html
Answer to the question:
var Db = require('mongodb').Db,
MongoClient = require('mongodb').MongoClient,
Server = require('mongodb').Server,
ReplSetServers = require('mongodb').ReplSetServers,
ObjectID = require('mongodb').ObjectID,
Binary = require('mongodb').Binary,
GridStore = require('mongodb').GridStore,
Code = require('mongodb').Code,
BSON = require('mongodb').pure().BSON,
assert = require('assert');
var db = new Db('integration_tests', new Server("127.0.0.1", 27017,
{auto_reconnect: false, poolSize: 4}), {w:0, native_parser: false});
// Establish connection to db
db.open(function(err, db) {
assert.equal(null, err);
// Add a user to the database
db.addUser('user', 'name', function(err, result) {
assert.equal(null, err);
// Authenticate
db.authenticate('user', 'name', function(err, result) {
assert.equal(true, result);
db.close();
});
});
});
var mongo = require('mongodb');
var MongoClient = mongo.MongoClient;
MongoClient.connect('mongodb://'+DATABASEUSERNAME+':'+DATABASEPASSWORD+'#'+DATABASEHOST+':'DATABASEPORT+'/'+DATABASENAME,function(err, db){
if(err)
console.log(err);
else
{
console.log('Mongo Conn....');
}
});
//for local server
//in local server DBPASSWOAD and DBusername not required
MongoClient.connect('mongodb://'+DATABASEHOST+':'+DATABASEPORT+'/'+DATABASENAME,function(err, db){
if(err)
console.log(err);
else
{
console.log('Mongo Conn....');
}
});
I find using a Mongo url handy. I store the URL in an environment variable and use that to configure servers whilst the development version uses a default url with no password.
The URL has the form:
export MONGODB_DATABASE_URL=mongodb://USERNAME:PASSWORD#DBHOST:DBPORT/DBNAME
Code to connect this way:
var DATABASE_URL = process.env.MONGODB_DATABASE_URL || mongodb.DEFAULT_URL;
mongo_connect(DATABASE_URL, mongodb_server_options,
function(err, db) {
if(db && !err) {
console.log("connected to mongodb" + " " + lobby_db);
}
else if(err) {
console.log("NOT connected to mongodb " + err + " " + lobby_db);
}
});
My version:
var MongoClient = require('mongodb').MongoClient;
MongoClient.connect('mongodb://user:pass#dhost:port/baseName', function(err, db) {
if (err) {
console.error(err);
}
var collection = db.collection('collectionName');
collection.find().toArray(function(err, docs) {
console.log(docs);
});
});
I recommend mongoskin I just created.
var mongo = require('mongoskin');
var db = mongo.db('admin:pass#localhost/mydb?auto_reconnnect');
db.collection('mycollection').find().toArray(function(err, items){
// do something with items
});
Is mongoskin sync? Nop, it is async.
Here is new may to authenticate from "admin" and then switch to your desired DB for further operations:
var MongoClient = require('mongodb').MongoClient;
var Db = require('mongodb').Db, Server = require('mongodb').Server ,
assert = require('assert');
var user = 'user';
var password = 'password';
MongoClient.connect('mongodb://'+user+':'+password+'#localhost:27017/opsdb',{native_parser:true, authSource:'admin'}, function(err,db){
if(err){
console.log("Auth Failed");
return;
}
console.log("Connected");
db.collection("cols").find({loc:{ $eq: null } }, function(err, docs) {
docs.each(function(err, doc) {
if(doc) {
console.log(doc['_id']);
}
});
});
db.close();
});
This worked for me:
Db.admin().authenticate(user, password, function() {} );
You can do it like this
var db = require('mongo-lite').connect('mongodb://localhost/test')
more details ...
if you continue to have problems with the native driver, you can also check out sleepy mongoose. It's a python REST server that you can simply access with node request to get to your Mongo instance.
http://www.snailinaturtleneck.com/blog/2010/02/22/sleepy-mongoose-a-mongodb-rest-interface/
With the link provided by #mattdlockyer as reference, this worked for me:
var mongo = require('mongodb');
var server = new mongo.Server(host, port, options);
db = new mongo.Db(mydb, server, {fsync:true});
db.open(function(err, db) {
if(!err) {
console.log("Connected to database");
db.authenticate(user, password, function(err, res) {
if(!err) {
console.log("Authenticated");
} else {
console.log("Error in authentication.");
console.log(err);
}
});
} else {
console.log("Error in open().");
console.log(err);
};
});
exports.testMongo = function(req, res){
db.collection( mycollection, function(err, collection) {
collection.find().toArray(function(err, items) {
res.send(items);
});
});
};
Slight typo with Chris' answer.
Db.authenticate(user, password, function({ // callback }));
should be
Db.authenticate(user, password, function(){ // callback } );
Also depending on your mongodb configuration, you may need to connect to admin and auth there first before going to a different database. This will be the case if you don't add a user to the database you're trying to access. Then you can auth via admin and then switch db and then read or write at will.
const { MongoClient } = require('mongodb');
// or as an es module:
// import { MongoClient } from 'mongodb'
// Connection URL
const url = 'mongodb://localhost:27017';
const client = new MongoClient(url);
// Database Name
const dbName = 'myProject';
async function main() {
// Use connect method to connect to the server
await client.connect();
console.log('Connected successfully to server');
const db = client.db(dbName);
const collection = db.collection('documents');
// the following code examples can be pasted here...
return 'done.';
}
main()
//what to do next
.then(console.log)
//if there is an error
.catch(console.error)
// what to do in the end(function result won't matter here, it will execute always).
.finally(() => client.close());
you can find more in the documentation here: https://mongodb.github.io/node-mongodb-native/4.1/
I'm using Mongoose to connect to mongodb.
Install mongoose npm using following command
npm install mongoose
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost:27017/database_name', function(err){
if(err){
console.log('database not connected');
}
});
var Schema = mongoose.Schema;
var userschema = new Schema ({});
var user = mongoose.model('collection_name', userschema);
we can use the queries like this
user.find({},function(err,data){
if(err){
console.log(err);
}
console.log(data);
});
I want to display all the databases and their respective collections and documents from mongoDB in NodeJS
One approach is to use the listDatabases() method:
var Db = require('mongodb').Db,
MongoClient = require('mongodb').MongoClient,
Server = require('mongodb').Server,
ReplSetServers = require('mongodb').ReplSetServers,
ObjectID = require('mongodb').ObjectID,
Binary = require('mongodb').Binary,
GridStore = require('mongodb').GridStore,
Grid = require('mongodb').Grid,
Code = require('mongodb').Code,
BSON = require('mongodb').pure().BSON,
assert = require('assert');
var db = new Db('test', new Server('localhost', 27017));
// Establish connection to db
db.open(function(err, db) {
// Use the admin database for the operation
var adminDb = db.admin();
// List all the available databases
adminDb.listDatabases(function(err, dbs) {
assert.equal(null, err);
assert.ok(dbs.databases.length > 0);
db.close();
});
});
Collections can be listed with collectionNames:
var MongoClient = require('mongodb').MongoClient,
format = require('util').format;
MongoClient.connect('mongodb://127.0.0.1:27017/test', function(err, db) {
if(err) throw err;
db.collectionNames(function(err, collections){
console.log(collections);
});
});
You could also use MongooseJS within node.js to expose the MongoDB-Native Object that will list all the databases and their respective collections
In node.js, install Mongoose as follows:
$ npm install mongoose
Now you can use the mongoose object to connect to MongoDB and map out all collections within the databases:
var mongoose = require('mongoose'),
url = 'mongodb://localhost/test';
mongoose.connect(url);
mongoose.connection.on('open', function(){
mongoose.connection.db.collectionNames(function(error, names) {
if (error) {
throw new Error(error);
} else {
names.map(function(name) {
console.log('found collection %s', name);
});
}
});
});
mongoose.connection.on('error', function(error){
throw new Error(error);
});
var Db = require('mongodb').Db,
Server = require('mongodb').Server
var db = new Db('test', new Server('localhost', 27017));
db.open(function (err, db) {
var adminDb = db.admin();
adminDb.listDatabases(function (err, dbs) {
if (err) console.log(err);
else console.log(dbs.databases);
var data = dbs.databases;
data.forEach(function (res) {
if (res.name == "node_REST") {
console.log(res);
}
})
db.close();
});
});
How do I programmatically create a database using the MongoDB Node.JS driver?
This looks promising, but I'm not sure how to connect to with the admin credentials and create a new database.
var db = new Db('test', new Server('locahost', 27017));
// Establish connection to db
db.open(function(err, db) {
assert.equal(null, err);
// Add a user to the database
db.addUser('user3', 'name', function(err, result) {
assert.equal(null, err);
// Authenticate
db.authenticate('user3', 'name', function(err, result) {
assert.equal(true, result);
// Logout the db
db.logout(function(err, result) {
assert.equal(true, result);
// Remove the user
db.removeUser('user3', function(err, result) {
assert.equal(true, result);
db.close();
});
});
});
});
});
in mongodb databases and collections are created on first access. When the new user first connects and touches their data, their database will get created then.
This seems to work.
var Db = require('mongodb').Db,
Server = require('mongodb').Server;
var db = new Db('test', new Server('localhost', 27017));
db.open(function (err, db) {
if (err) throw err;
// Use the admin database for the operation
var adminDb = db.admin();
adminDb.authenticate('adminLogin', 'adminPwd', function (err, result) {
db.addUser('userLogin', 'userPwd', function (err, result) {
console.log(err, result);
});
});
});
Try as below:
var adminuser = "admin";
var adminpass = "admin";
var server = "localhost";
var port = 27017;
var dbName = "mydatabase";
var mongodb = require('mongodb');
var mongoClient = mongodb.MongoClient;
var connString = "mongodb://"+adminuser+":"+adminpass+"#"+server+":"+port+"/"+dbName;
mongoClient.connect(connString, function(err, db) {
if(!err) {
console.log("\nMongo DB connected\n");
}
else{
console.log("Mongo DB could not be connected");
process.exit(0);
}
});