This is a simple converter

csvtojson.js

//usage: node csvtojson.js <filename.csv>
//output: <filename>.json

const fs = require('fs');

const originalFileName = process.argv[2];

const newFileName = originalFileName.split(".")[0] + ".json";
console.log("new file name is :",newFileName);

const converter = () => {
    if (originalFileName) {
        fs.readFile(originalFileName, "utf-8", function (err, data) {
            let newFileContent = [];
            console.log("data loaded in");
            let content = data.split("\r\n"); // windows breakline characters
            let headerCSV = content.shift(); 
            const header = headerCSV.split(",");
        
            content.forEach((row) => {
                let newRow = {}; 
                elements = row.split(",");
                elements.forEach((elem, index) => {
                    newRow[header[index]] = elem;
        
                })
                newFileContent.push(newRow);
            });
            console.log("data processed");
            fs.writeFileSync(newFileName,JSON.stringify(newFileContent) , 'utf-8'); 
            console.log("writing to file compelte");
        });
    }
}

converter();