nginx-proxy-manager/backend/lib/express/jwt-decode.js

const Access = require('../access');

module.exports = () => {
	return function (req, res, next) {
		res.locals.access = null;
		let access        = new Access(res.locals.token || null);

		// Allow unauthenticated access to get the oidc configuration
		let oidc_access =
			req.url === '/oidc-config' &&
			req.method === 'GET' &&
			!access.token.getUserId();

		access.load(oidc_access)
			.then(() => {
				res.locals.access = access;
				next();
			})
			.catch(next);
	};
};