Axios interceptors - Not using instance until AsyncStorage resolved? - react-native

Question

I've an Axios Interceptor setup to manage responses and cut down on re-writing code everywhere. Currently, I need to add the Authorization header using the { config } object in each call like below.
apiCall = () => {
const token = await AsyncStorage.getItem('JWT_BEARER_TOKEN');
const config = {
headers: {
'Authorization': 'Bearer ' + token,
}
}
const attendance = await axiosInstance.post('/team/matchday', data, config);
// ... do something with attendance
}
I'd like to do it in the axiosInstance I've create as below, but I'm getting a promise rejected error. I presume this is because token is still an incomplete promise when it is returned.
Any ideas how to handle this config correctly?
import { AsyncStorage, Alert } from 'react-native';
import axios from 'axios';
const ReturnAxiosInstance = async (token) => {
const AxiosInstance = axios.create({
baseURL: 'http://localhost:4000',
timeout: 3000,
headers: {
'Content-Type': 'application/json',
'Authorization': 'Bearer ' + await AsyncStorage.getItem('JWT_BEARER_TOKEN'),
},
});
AxiosInstance.interceptors.response.use(
response => response,
(error) => {
if (!error.response) {
Alert.alert('Network Error!');
return console.log(error);
// return dispatch({ type: 'NETWORK_FAILURE' });
} else if (error.response.status === 500) {
Alert.alert('Server Error!');
} else if (error.response.status === 404) {
Alert.alert('Endpoint doesn\'t exist!');
}
// handle the errors due to the status code here
return error.response;
},
);
return AxiosInstance;
};
export default ReturnAxiosInstance();

Answer 1

You need to add in the request interceptor for your Axios instance.
// ...
axiosInstance.interceptors.request.use(
async (config) => {
config.headers.authorization = await AsyncStorage.getItem('JWT_BEARER_TOKEN');
return config;
},
error => Promise.reject(error)
);
// ...