Convert chrome bookmarks file to json

bookmarks2json.js

const fs = require('fs'),
    path = require('path'),
    { promisify } = require('util'),
    readFileAsync = promisify(fs.readFile),
    writeFileAsync = promisify(fs.writeFile),
    inPath = path.join(__dirname, 'bookmarks.html'),
    outPath = path.join(__dirname, 'bookmarks.json'),
    linkRx = /<A([^>]+)>([^<]+)<\/A>/ig;


const extractAttr = (attrName, attrStr) => {
    let pos;

    if ((pos = attrStr.indexOf(attrName)) === -1) {
        return null;
    }
    pos = pos + attrName.length + 2;
    return attrStr.substring(pos, attrStr.indexOf('"', pos));
}

const parseLink = (attrs, title) => {
    let hash, attrValue;
    const rv = {};

    title = title.replace('&quot;', '"');

    if ((hash = title.indexOf('#')) === -1) {
        rv.title = title;
    }
    else {
        rv.title = title.substr(0, hash).trim();
        rv.tags = title.substr(hash + 1).split(' ').map(s => s.trim()).filter(s => s.length);
    }

    if ((attrValue = extractAttr('HREF', attrs)) !== null) {
        rv.url = attrValue;
    }
    else { // No URL - bailing out
        return null;
    }

    if ((attrValue = extractAttr('ADD_DATE', attrs)) !== null) {
        rv.add_date = attrValue;
    }

    if ((attrValue = extractAttr('ICON_URI', attrs)) !== null) {
        rv.icon_uri = attrValue;
    }

    return rv;
}


const convert = html => {
    const rv = [];
    let link;

    while ((link = linkRx.exec(html)) !== null) {
        link = parseLink(link[1], link[2]);
        if (link !== null) {
            rv.push(link);
        }
    }

    return JSON.stringify(rv);
}

readFileAsync(inPath)
    .then(convert)
    .then(json => writeFileAsync(outPath, json))
    .then(result => console.log(`Done!`))
    .catch(console.error);