apolloClientWithJWT.js

import { HttpLink, ApolloClient, InMemoryCache } from "apollo-boost";
import { AsyncStorage } from "react-native";
import { setContext } from "apollo-link-context";

const httpLink = new HttpLink({ uri: "http://localhost:8000/graphql/" });
const authLink = setContext(async (req, { headers }) => {
  const token = await AsyncStorage.getItem("authToken");

  return {
    ...headers,
    headers: {
      authorization: token ? `JWT ${token}` : null
    }
  };
});

const link = authLink.concat(httpLink);
const client = new ApolloClient({
  link,
  cache: new InMemoryCache()
});

export default client;