how to connect mongoose to mongodb code example

Example 1: mongoose connect

import mongoose from 'mongoose'

export const connectDb = async () => {
  try {
    await mongoose.connect('mongodb://localhost:27017/test', {
      useNewUrlParser: true,
      useUnifiedTopology: true,
      useCreateIndex: true,
    })
  } catch (error) {
    console.log(error.message)
  }
}

Example 2: mongoose connection node

mongoose.connect('mongodb://localhost/myapp', { useNewUrlParser: true, useUnifiedTopology: true });

Example 3: mongoose connect

mongoose.connect('mongodb://username:password@host:port/database?options...', {useNewUrlParser: true});