This NPM-package can simplify fractions and prime factorize numbers.
npm install prime-factorizer --save
const Factorizer = require('prime-factorizer');
/// Simple factorization ///
let myArrayOfFactors = Factorizer.factors(210);
console.log(myArrayOfFactors);
// > [ '2', '3', '5', '7' ]
/// Fraction simplification ///
let mySimplifiedFraction = Factorizer.simplify(130, 35);
console.log(mySimplifiedFraction);
// > [ 26, 7 ]