sa-node-postgres/insert-data.js

const { Client } = require('pg')

const client = new Client({
    user: 'postgres',
    host: 'localhost',
    database: 'testdb',
    password: '1234abcd',
    port: 5432,
});

client.connect()

const query = `
INSERT INTO users (email, firstName, lastName, age)
VALUES ('johndoe@gmail.com', 'john', 'doe', 21)
`

client.query(query, (err, res) => {
    if (err) {
        console.error(err);
        return;
    }

    console.log('Data insert successful');
});