var jose = require('node-jose');

const keystore = jose.JWK.createKeyStore();

const private_key = ...;

keystore.add(private_key, 'pem').
    then((result) => {
        console.log(result);
        jose.JWE.createDecrypt(keystore).
            decrypt(payload).
            then((result) => {
                console.log(result.plaintext.toString());
            });
    });