JWT for React

react-jwt-auth.js

import React from 'react';

let cachedToken;

function setToken(token) {
    cachedToken = token;
    localStorage.setItem('authToken', token);
}

function getToken() {
    if (!cachedToken) {
        cachedToken = localStorage.getItem('authToken');
    }

    return cachedToken;
}

function removeToken() {
    cachedToken = null;
    localStorage.removeItem('authToken');
}

function isAuthenticated() {
    return !!getToken();
}

axios.post('https://localhost:5000/api/auth', { 'Authorization': `Bearer ${token}` })
    .then(response => response.data)
    .then(token => setToken(token));