app.use( '/good/api', createProxyMiddleware({ target: API_HOST, changeOrigin: true, pathRewrite(pathReq, req) { const pathname = pathReq.split('?')[0]; let url = `${pathname}?appID=${APP_ID}`; url = Object .entries(req.query) .reduce( (newUrl, [key, value]) => `${newUrl}&${key}=${encodeURI(value)}`, url, ); return url; } }) );