Use nodeJS to insert values into existing PostgreSQL table from JSON file

JSONtoSQL.js

const { Client } = require('pg')
const fs = require('fs')
const local_file = require('./your_json_data.json')


class Postgres {
    constructor() {
        this.client = new Client({
            user: 'postgres',
            host: 'xx.xxx.xxx.xx',
            database: 'postgres',
            password: 'password',
            port: xxxx,
        })

        this.client.connect()
    }

    async query(sql) {
        try {
            const { rows } = await this.client.query(sql)
            return rows
        } catch (err) {
            throw err
        }
    }
}

async function run() {
    const postgres = new Postgres()


    const makeVal = (val)=>{
        if(val === undefined) {
            return "NULL"
        } else {
            return "'" + JSON.stringify(val).replace(/'/g, "''") + "'" 
        }
    }

    const makeVals = (objs) => {
        return objs.map((obj) => makeVal(obj)).join(',')
    }

    for(let k of Object.keys(local_file)) {
        try {

            const query = `INSERT INTO your_table (
                id,
                title,
                category,
                author,
                published_at,
                images,
                ) 
                VALUES(` + makeVals([
                    k,
                    local_file[k].title,
                    local_file[k].type,
                    local_file[k].author,
                    local_file[k].publishedAt,
                    local_file[k].attachments.images,
                ]) + ')'

            console.log(query)
            postgres.query(query)
        } catch(err) {
            throw err
        }
    }
}

run()