Amazon web services – Why am I getting error: no pg_hba.conf while connecting nodejs application to aws rds Postgres?

I have created an instance of RDS Postgres on database. I am trying to use it in my nodejs application as remote database. The things require to make connection to db include endpoint, username, password, port and I’ve got all of them. following is how i stored URL in .env file:

POSTGRES_URL=postgres://<username>:<password>@<end-point>:5432/<db>

In my node application, I have configured the database as following:

database.ts

import { Sequelize } from 'sequelize';

const dbUrl:string = process.env.POSTGRES_URL || '';

const sequelize: Sequelize = new Sequelize(dbUrl, {
    dialect: 'postgres',
});

export default sequelize;

index.ts

import sequelize from "./config/database";
const connectDB = async (): Promise<void> => {
    try {
        await sequelize.authenticate();
        console.log('DB connected successfully.');
    } catch (error) {
        console.error('Unable to connect to the database:', error);
    }
};
//connect db then run server
connectDB().then(() => {
    app.listen(process.env.PORT, (): void => {
        console.log(`Server is running on port ${process.env.PORT}`);
    });
});

when I run cmd npm run dev i get error like this:

original: error: no pg_hba.conf entry for host <my-ip>, user <username>, database <db>, no encryption.  
at Client._connectionCallback (/<path>/node_modules/sequelize/src/dialects/postgres/connection-manager.js:196:24)

All variables inside <> symbols above are same as in URL.

I tried to run db through Ubuntu terminal using following command:

psql --host=<end-point> --port=5432 --username=<username> --password

It asks for password and as I enter password, it starts without any error.
Problem only arises in nodejs application.