bcrypt

const bcrypt = require('bcrypt');

const src = 'hello world';

const salt = bcrypt.genSaltSync(10);

const hash1 = bcrypt.hashSync(src, salt);
const hash2 = bcrypt.hashSync(src, salt);

console.log(`src = ${src}`);

console.log(`salt = ${salt}\n`);
console.log(`hash 1 = ${hash1}`);
console.log(`hash 2 = ${hash2}\n`);
console.log(`compare 1 = ${bcrypt.compareSync(src, hash1)}`);
console.log(`compare 2 = ${bcrypt.compareSync(src, hash2)}`);

Запустил два раза, ниже результаты:

src = hello world
salt = $2b$10$cHO7HgdB744ZvkdXy.vdYe

hash 1 = $2b$10$cHO7HgdB744ZvkdXy.vdYeI8XHBqYcYOv2u8mVsb4EUAmDCQJeIiS
hash 2 = $2b$10$cHO7HgdB744ZvkdXy.vdYeI8XHBqYcYOv2u8mVsb4EUAmDCQJeIiS

compare 1 = true
compare 2 = true

src = hello world
salt = $2b$10$LoFfv/RCHkVO1leLS8UMwe

hash 1 = $2b$10$LoFfv/RCHkVO1leLS8UMwe.bljq9q5/9H.azm7KLuOxxrQylD0Rwy
hash 2 = $2b$10$LoFfv/RCHkVO1leLS8UMwe.bljq9q5/9H.azm7KLuOxxrQylD0Rwy

compare 1 = true
compare 2 = true