Read huge JSON with Node

readasync.js

const StreamArray = require('stream-json/streamers/StreamArray');
const fs = require('fs');


let combine = "Working_Vietnamese_English_Combined.json";
let vnedict = `vnedict__vietnamese-english.json`

const jsonStream = StreamArray.withParser();
fs.createReadStream(vnedict).pipe(jsonStream.input);


const combinedictjson = fs.readFileSync(combine);
const combinedictArray = JSON.parse(combinedictjson);

let combinedDictionary = []
let indexTracking = 0;

jsonStream.on('data', ({ key, value }) => {
    let wordvndict = value.word.toLowerCase().trim();

    let flag = false;
    for (let i = 0; i < combinedictArray.length; i++) {
        let combineEachWord = combinedictArray[i].word.toLowerCase().trim();

        if (wordvndict === combineEachWord) {
            flag = true;
            let eachItem = {}
            eachItem.word = combineEachWord
            eachItem.meaning = combinedictArray[i].meaning;
            eachItem.meaningvnedict = combinedictArray[i].meaningvnedict
            combinedDictionary.push(eachItem)
            break;
        }

    }

    if (flag === false) {
        let eachItem = {}
        eachItem.word = value.word
        eachItem.meaning = "";
        eachItem.meaningvnedict = value.meaning;
        combinedDictionary.push(eachItem)
    }


});

jsonStream.on('end', (what) => {
    console.log(indexTracking)
    let data = JSON.stringify(combinedDictionary)
    fs.writeFile('Vietnamese_English_Combined.json', data, (err) => {
        if (err) throw err;
        console.log('Data written to file');
    });

    console.log('All Done');
});

//source: http://www.denisowski.org/Vietnamese/vnedict.txt
//https://www.informatik.uni-leipzig.de/~duc/TD/td/index.php?bpos=0&db=ev