PKCE_codes.js

gistfile1.txt

var crypto = require('crypto');

function base64URLEncode(str) {
    return str.toString('base64')
        .replace(/\+/g, '-')
        .replace(/\//g, '_')
        .replace(/=/g, '');
}
var verifier = base64URLEncode(crypto.randomBytes(32));

function sha256(buffer) {
    return crypto.createHash('sha256').update(buffer).digest();
}

var challenge = base64URLEncode(sha256(verifier));

console.log("verifier :" + verifier);
console.log("challenge :" + challenge);