DeprecationWarning: Mongoose: the `strictQuery` option will be switched back to `false` by default in Mongoose 7

mongoose.set("strictQuery", false);

mongoose.connect(process.env.MONGO_URL);

OR

mongoose.set("strictQuery", false);
mongoose.connect(process.env.MONGO_URL, () => {
  console.log("Connected to MongoDB");
});

const connectDB = async () => {
    try {
        mongoose.set('strictQuery', false);
        await mongoose.connect(db, {
            useNewUrlParser: true,
            useUnifiedTopology: true,
        });
        console.log('MongoDB Connected...');
    } catch (err) {
        console.error(err.message);
        // make the process fail
        process.exit(1);
    }