javascript - Can't display data from REST call, even though the server is sending data -

i trying perform rest call token in header display information. there required header token code looks restclient.js, app.js, , users.js.

//restclient.js import { jsonserverrestclient, fetchutils } 'admin-on-rest';  const httpclient = (url, options = {}) => {     if (!options.headers) {         options.headers = new headers({ accept: 'application/json' });     }     options.headers.set('token', 'admin');     return fetchutils.fetchjson(url, options); }  const restclient = jsonserverrestclient('http://localhost:8080/api/v2', httpclient);  export default (type, resource, params) => new promise(resolve => settimeout(() => resolve(restclient(type, resource, params)), 500));  //app.js import react, {component} 'react'; import { admin, resource } 'admin-on-rest';  import { userlist } './users'; import restclient './restclient';  class app extends component {   render() {     return(           <admin restclient={restclient}>               <resource name="admin/user" list={userlist}/>           </admin>     );   } } export default app;  //users.js // in src/users.js import react 'react'; import { list, datagrid, emailfield, textfield, simplelist } 'admin-on-rest';  export const userlist = (props) => (     <list {...props}>         <datagrid >             <textfield source="email"/>             <textfield source="info"/>         </datagrid>     </list> ); 

example of json

i've tested rest call postman , returning data. there anyway check data being sent in call? server running express.js , i've set route include required headers.i've attached example of json looks returning.

since aor fetchutils returns promise. can intercept promise , perform kind of inspection want (and lot more too)

below how code handling similar. intercepting api call , displaying custom notifications.

function handlerequestandresponse(url, options={}) {   return fetchutils.fetchjson(url, options)     .then((response) => {       const {headers, json} = response;       //admin on rest needs {data} key       const data = {data: json}       if (headers.get('x-total-count')) {         data.total = parseint(headers.get('x-total-count').split('/').pop(), 10)       }       // handle get_list responses       if (!isnan(parseint(headers.get('x-total-count'), 10))) {         return {data: json,                 total: parseint(headers.get('x-total-count').split('/').pop(), 10)}       } else {         return data       }   }) } 

you can below

return fetchutils.fetchjson(url, options) .then(res => {     console.log(res)     return res })