Remove a set of block-listed keys from a json file

sanitizejson.js

const fs = require('fs')
const path = require('path')

const inputDirectory = process.argv[process.argv.indexOf('-i') + 1]
const outputDirectory = process.argv[process.argv.indexOf('-o') + 1]

const BLOCK_LIST = new Set(['type', 'description', 'extensions'])

if (!fs.existsSync(outputDirectory)){
    fs.mkdirSync(outputDirectory);
}

const filenames = fs.readdirSync(inputDirectory);
filenames.forEach(filename => {
    sanitizeFile(filename)
})

function sanitizeFile(filename) {
    const filePath = path.resolve(`${inputDirectory}/${filename}`)
    const file = fs.readFileSync(filePath)
    const json = JSON.parse(file)
    const result = sanitize(json)

    fs.writeFileSync(`${outputDirectory}/${filename}`, JSON.stringify(result, null, 2))
}

function sanitize(obj) {
    Object.keys(obj).forEach(key => {
        if (BLOCK_LIST.has(key.toLowerCase())) {
            obj[key] = undefined;
        } else if (typeof obj[key] === 'object') {
            obj[key] = sanitize(obj[key]);
        }
    });

    return obj;
}