Simple script to validate POW in .js

Validate PoW

const Crypto = require('iota.crypto.js')
const IOTA = require('iota.lib.js')
const pify = require('pify')

const iota = new IOTA({ provider: 'https://nodes.iota.cafe:443' })

// Vars
const bundle =
    'G9QJBOOSY9UDEZZBX9HPEHIOJRLXGCSTIENORDH9KD9SCHOFHJXLIGGVHJZ99VUSUKFZLYVNQEQAHWLGW'

/// Validate Pow
const validatePow = async (bundleHash, mwm) => {
    // findTransactionObjects wraps a number of functions. Most
    // important func is: iota.utils.transactionObject()
    // This step generates the tx hash of the trytes returned from the network.
    // So you are not relying on a third party just pasting in a 👌 hash
    const bundles = await pify(iota.api.findTransactionObjects.bind(iota.api))({
        bundles: [bundleHash]
    })

    // Uncomment the below line to make hash invalid (for testing)
    // bundles[0].nonce = '999999999999999999999999999'

    ////////////// Find MWM of TX ////////////
    // 1. Map array
    // 2. Converts the trytes to trits
    // 3. Reverse the Array (Pow finds a nonce for which the resulting tx hash has a {mwm} of zeros at the end)
    // 4. Map through the array to find the first index that is not 0
    // 5. Saves this new array of indexes
    const powSlice = bundles.map(tx =>
        Crypto.converter
            .trits(iota.utils.transactionTrytes(tx).hash)
            .reverse()
            .findIndex((trit, i) => trit !== 0)
    )

    // Check MWM passed into this function is greater than or = to the length of 0's in tx hash
    console.log('MWM of txs: ' + powSlice)
    let pow = powSlice.map(pow => pow >= mwm)

    // Return result
    if (pow.includes(false)) {
        console.log('PoW appears invalid')
        return false
    } else {
        console.log('PoW appears valid')
        return true
    }
}

validatePow(bundle, 14)