节点，TypeError：无法读取未定义的属性（读取“连接”）。 mongoClient 连接时出错

Question

How to resolve this error??? during mongodb connection?

const mongoClient=require('mongodb').mongoClient  
const state={
db:null
}
module.exports.connect=function(done){
const url='mongodb://localhost:27017'
const dbname='shopping'

mongoClient.connect(url,(err,data)=>{
    if(err) return done(err)
    state.db=data.db(dbname)

    done()
})

}

module.exports.get=function(){
return state.db
}

Answer 1

It's not mongoClient , replace it with MongoClient . The reason for the error is that it's case sensitive:

const MongoClient=require('mongodb').MongoClient

Also replace MongoClient.connect