Read json, add hash uid, save json

add-hash-to-config.js

const crypto = require('crypto');
const fs = require('fs');

const hash = data => crypto.createHash('sha1').update(data).digest('hex');
const usedHashes = [];

fs.readFile('config.json', (err, data) => {
    const json = JSON.parse(data.toString());
    // console.log(json);
    addUid(json);
});

function addUid(config) {
    Object.keys(config).forEach(dis => {
        config[dis].forEach((account, i) => {
            // console.log(account);
            // account.uid = hash(account.title);
            // config[dis][i] = Object.assign({uid: hash(account.title)}, account);
            const hs = hash(account.title);
            if (usedHashes.indexOf(hs) > -1)
                throw new Error('collision detected');
            usedHashes.push(hs);
            config[dis][i] = {uid: hs, ...account};
        })
    })
    // console.log(config);
    saveConfig(config);
}

function saveConfig(config) {
    fs.writeFile('hashed-config.json', JSON.stringify(config), (err)=>{});
}