db_connect.js

const mongoose = require("mongoose");
require("dotenv").config();

mongoose
  .connect(process.env.MONGO_URI, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => console.log("db is successfully connected !"))
  .catch((error) => console.log(error, "connection to db failed !"));

mongoose.connection.on("connected", () => {
  console.log("Mongo has connected succesfully");
});
mongoose.connection.on("reconnected", () => {
  console.log("Mongo has reconnected");
});
mongoose.connection.on("error", (error) => {
  console.log("Mongo connection has an error", error);
  mongoose.disconnect();
});
mongoose.connection.on("disconnected", () => {
  console.log("Mongo connection is disconnected");
});

module.exports = mongoose;