[FP playground] Generate diceware passwords with NodeJS. See also: https://www.rempe.us/diceware/

app.js

const map = fn => list => list.map(fn);
const filter = fn => list => list.filter(fn);
const compose = (...fns) => fns.reduce((f, g) => (...args) => f(g(...args)));
const tail = list => list.slice(1);
const fill = val => num => new Array(num).fill(val);

const getFileContents = file => require('fs').readFileSync(file, { encoding: 'utf8' });

const split = char => str => str.split(char);
const join = char => list => list.join(char);

const isWordLine = str => /[1-6]{5}\t.+/.test(str);

const getWordList = compose(map(split('\t')), filter(isWordLine), split('\n'), getFileContents);

const wordList = getWordList('eff.wordlist.txt');

const roll1D6 = () => Math.round((Math.random() * 5) + 1);
const roll5D6 = () => map(roll1D6)(fill(0)(5));

const getWord = n => wordList.find(i => i[0] === n);
const getRandomWord = compose(join(' '), tail, getWord, join(''), roll5D6);
const getRandomWords = compose(join(' '), map(getRandomWord), fill(0));

const app = len => compose(join('\n'), map(() => getRandomWords(len)), fill(0));

//
// App
//
const numberOfWordsInPassword = 8;
const numberOfPasswords = 25;
const out = app(numberOfWordsInPassword)(numberOfPasswords);

console.log(out);

eff.wordlist.txt

11111	abacus
11112	abdomen
11113	abdominal
11114	abide
11115	abiding
11116	ability
11121	ablaze
11122	able
11123	abnormal
11124	abrasion
11125	abrasive
11126	abreast
11131	abridge
11132	abroad
...

See: https://www.eff.org/files/2016/07/18/eff_large_wordlist.txt