mongodb TypeError: client.db.collection is not a function

Question

when I use "mongodb": "^3.0.5",

    const cn = require('./connect');

    function showItems(req, callback) {
      cn.MongoClient.connect(cn.url, (err, database)=> {

        const collection = database.db.collection('items');

        collection.find({}).toArray((err, result)=> {

          callback(result);
        });

        database.close();
      })
    }

    module.exports = showItems;

I got,

/node_modules/mongodb/lib/mongo_client.js:433

throw err

^

TypeError: database.db.collection is not a function

But,when I use "mongodb": "^2.2.33" , it worked.

    const cn = require('./connect');

    function showItems(req, callback) {
      cn.MongoClient.connect(cn.url, (err, db)=> {

        const collection = db.collection('items');

        collection.find({}).toArray((err, result)=> {

          callback(result);
        });

        db.close();
      })
    }

    module.exports = showItems;

connect.js

    const url = "mongodb://127.0.0.1:27017/databasename";
    const MongoClient = require('mongodb').MongoClient;

    module.exports = {url, MongoClient};

Use "mongodb": "^3.0.5" , How to solve this problem ?

don't know how this works in earlier version, Here is a guide that may help using later/latest version github.com/usman154/movieApp — Muhammad Usman
– Muhammad Usman, Commented Apr 4, 2018 at 9:28
What does your ./connect do ? If you want to use cn.MongoClient.connect you shoud replace const cn = require('./connect'); by const cn = require('mongodb'); — Mickael
– Mickael, Commented Apr 4, 2018 at 9:33

Paaarth · Accepted Answer · 2018-04-04 09:47:19Z

1

I think this is permission error.so we need to get the database first then try to access the collections. will solve the problem.

const MongoClient = require('mongodb').MongoClient;
const cn = require('./connect');

MongoClient.connect(cn.url, (err, database) => {
  if (err) {
    console.log(err);
    throw err;
  } else {
    const myDB = database.db('myDatabaseName')
    const collection = myDB.collection('items');
    collection.find({}).toArray((err, result) => {
      callback(result);
    });
    db.close();
  }
}

answered Apr 4, 2018 at 9:47

Paaarth

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2 Comments

feishuoren Over a year ago

still this issue

Paaarth Over a year ago

then uninstall mongo from npm js & reinstall npm package will solve your problem.

Nicolas · Accepted Answer · 2018-04-04 09:28:30Z

0

Try with :

client.collection()

instead.

The connect method return the database object.

answered Apr 4, 2018 at 9:28

Nicolas

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2 Comments

feishuoren Over a year ago

TypeError: client.collection is not a function

Nicolas Over a year ago

Did you check the err value ?

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