为什么我无法从axios中的json获取数据

import FetchClient from 'app/utils/FetchClient';
import IdsAndByIds from 'app/utils/IdsAndByIds';
import { eventsFetch,setEvents } from './actions';
export const getEvents = () => async (dispatch) => {
try {
const { data } = await FetchClient.get('./db.json');
dispatch(setEvents(IdsAndByIds(data)));
dispatch(eventsFetch(false));
} catch (error) {
console.log(error);
}
};

import axios from 'axios';
import { URL_API } from 'app/config'; //localhost:3009
const FetchClient = () => {
const defaultOptiOns= {
baseURL: URL_API,method: 'get',headers: {
'Content-Type': 'application/json'
}
};
const instance = axios.create(defaultOptions);
return instance;
};
export default FetchClient();

import * as types from './types';
export const eventsFetch = value => ({
type: types.FETCHING_EVENTS,payload: value
});
export const setEvents = ({ objById,arrayIds }) => ({
type: types.SET_EVENTS,payload: {
eventById: objById,eventsorder: arrayIds
}
});