Validation JWT Bearer token issued by IdentityServer in NodeJS

auth.js

import passport from 'passport'
import {BearerStrategy} from 'passport-azure-ad';

const options = {
    clientID: 'x', //irelevant
    identityMetadata: '<IDSrv URL>/.well-known/openid-configuration',
    issuer: '<IDSrv issuer>',
    audience: '<IDSrv audience>',
    passReqToCallback: true
};

const clientAuthenticationStrategy = new BearerStrategy(options,
    (req, token, done) => {
        if (!token) return done("no token", null)
        req.requestToken = token
        return done(null, token);
    });

const configure = app => {
    passport.use('identity-server-authentication', clientAuthenticationStrategy);
    app.use(passport.initialize());
    return passport;
};

export default {configure}