MeetMartin

const express = require('express');
const cookieParser = require('cookie-parser');
const bodyParser = require('body-parser');

// csrf protection
const csrf = require('csurf');
// session management using cookies
const session = require('express-session');

var csrfProtection = csrf({ cookie: true });

MeetMartin

import React from 'react';

import useDeviceType from '../hooks/useDeviceType';

const DeviceComponent = () => {
  const isMobile = useDeviceType();
  
  return (
    <p>
      You are using a {isMobile ? 'mobile device' : 'computer'}.

MeetMartin

import useInterval from './useInterval';

// use as useHeartBeat(time); which writes out 'I am alive!' every 'time' milliseconds
const useHeartBeat = useInterval(() => console.log('I am alive!'));

export default useHeartBeat;

MeetMartin

import React from 'react';

import useInterval from '../hooks/useInterval';

const MyIntervalComponent = () => {
  useInterval(() => console.log('Hello World'))(5000);
  
  return (<p>Output 'Hello World' to console every five seconds.</p>);
};

MeetMartin

import React, { useEffect } from 'react';

const MyComponentWithInterval = () => {
  useEffect(() => {
    const myInterval = setInterval(() => {
          console.log('Hello World');
    }, 5000);
    return () => clearInterval(myInterval);
  }, []);
  

MeetMartin

import { useEffect, useState } from 'react';
import { includes, reduce, lowerCaseOf } from '@7urtle/lambda';

const mobileDevices = ['ipad', 'iphone', 'ipod', 'android'];
const includesAnyOf = where => reduce(false)((a, c) => includes(c)(where) ? true : a);
const isDeviceMobile = () =>
    includesAnyOf(lowerCaseOf(navigator.userAgent))(mobileDevices) ||
    includesAnyOf(lowerCaseOf(navigator.platform))(mobileDevices) ||
    (includes("Mac")(navigator.userAgent) && "ontouchend" in document);
    

MeetMartin

import jwt from 'jsonwebtoken';

// don't fortget to generate your own private and public key
// by openssl: https://gist.github.com/MeetMartin/8b3e72e4b94cdc6d063671a69440a7e2

const privateKey =
`-----BEGIN EC PRIVATE KEY-----
MIHcAgEBBEIANjT0EzYXVqsHeKitVMvAQ57pzZWcv5QEWsCap4hl3mk/DIkRCYzg
9YGcBtLWhuNitEeKFGLi91rohc2EzmTVIbOgBwYFK4EEACOhgYkDgYYABAFjzu7a
UwPT7fIFtwc89Vrkj4a1iXOYNhWEZ97V2EbpFq3AU28o7MoV+IbSv/VrGsHA/1SD

MeetMartin

# private key
openssl ecparam -genkey -name secp521r1 -noout -out es512-private.pem
# public key
openssl ec -in ecdsa-p521-private.pem -pubout -out es512-public.pem 

MeetMartin

import jwt from 'jsonwebtoken';

const key = 'MuchSecretVerySecureSoSafe';

const theSecret = jwt.verify(token, key); // returns the original encrypted JSON

MeetMartin

import axios from 'axios';

cons postToMyApi = payload =>
  axios.post(
      '/v1/my-api',
      {
          "request": payload.request
      },
      {
          headers: {