CSC309 Review

HTML, CSS

URL:

scheme:[//[user:password@]host[:port]][/]path[?query][#fragment]

HTML

Describe content and structure of a webpage.
Made up by elements marked by tags
- <element>[content]</element>
- required tags thirdLevel<!DOCTYPE html>
  - <html> thirdLevel<body>

HTML5

Designed to support modern multimedia

CSS

Describe appearance, layout and presentation of info
Describe how info is to be displayed
<style> or separate .css file
<link href="styles.css" rel="stylesheet" />
syntax css selector { property: value; property: value; }
Bowser's default styles -> external css (in a <link> tag) -> embedded <style> tag -> inline style (style="name:value;") -> !important

Elements

id provides a unique identifier for an element
class provides a general way of accessing certain elements
pseudo-classes: a:hover

CSS box model

Each element: content, padding, border margin
width = content width + L/R padding + L/R border + L/R margin
height = content height + T/B padding + T/B border + T/B margin
width: percentage or pixels (can apply max-width, min-width)
float: remove element from normal document flow
Need to clear element that follow a floating element

HTTP, Servers

HTTP

Protocols:
- Application layer: FTP, HTTP, SSH, IMAP
- Transport Layer: TCP, UDP
- Internet Layer: IP
- Link Layer: Ethernet, Wi-Fi
IP:
- Connectionless protocol
- Transfer packets from source address to dest
TCP/IP:
- TCP: Transmission Control Protocol
  - Connection Oriented
  - Reliable
Application Layer Protocols
- One piece of an app
- Defines messages exchanged by apps
- Uses services provided by lower layer protocols
- Application:
  - Running on network hosts in user space
  - Exchange messages to implement app
API:
- Application programming interface
- Define interface between application and transport layer
- Socket:
  - Send, receive
HTTP:
- Hypertext Transfer Protocol
- Sits on top of TCP
- Transfer objects between client and server
- Process:
  - http client initiates TCP connection on http server
  - http server accepts the connection, notify client
  - client sends http request message into TCP socket
  - http server receives request message, form response message and sends into socket
- HTTP is stateless:
  - Does not maintain status info across client reqs
  - No way to correlate multiple req from some user
  - Protocols that maintain state are complex
  - History must be maintained
  - If server of client crashes, their view of state may be inconsistent and must be reconciled.
Simple server

Javascript and DOM

Javascript:

Not related to java
Always "use strict"

IIFE:

Immediately invoked function expression
(function defining)();

Anonymous functions:

no function name to display in stack trees
can't refer to itself for recursion or unbinding and event handler

Closure:

return

Objects:

var point = {x: 10, y: 20};
var point = {"x": 10, "y": 20};
is a container of properties (name: value pairs)
Methods in Objects: - (methodName: functionName) - Object.methodName()
Adding properties:
- Object.newProperty = newProperty

this:

Different from other programming languages
Refers to the containing object of the call-site of a function, not where the function is defined
Not eligible for this binding under "use strict"

Explicit binding:

[IMAGE]
Lost binding:
- [IMAGE]
Explicit binding:
- [IMAGE]

DOM

Document Object Model
[IMAGE]

BOM

Browser Object Model
[IMAGE]
window
- Top level object in BOM
- Methods: thirdLevelalert, confirm, prompt
  - setInterval, setTimeout, clearInterval, clearTimeout
  - open, close thirdLevelblur, focus, moveBy, moveTo, print, resizeBy, resizeTo, scrollBy, scrollTo
document:
- Current page and its elements
- Properties:
  - anchors, body, cookie, domain, forms, images, links, referrer, title, URL
- Methods:
  - getElementById
  - getElementsByName
  - getElementsByTagName
  - close, open, write, writeln
location:
- URL of the current page
- Properties:
  - host, hostname, href, pathname, port, protocol, search
- Methods: thirdLevelassign, reload, replace
navigator
- Information about the browser
- Properties:
  - appName, appVersion, browserLanguage, cookieEnabled, platform, userAgent
screen
- Info about display screen
- Properties:
  - availHeight, availWidth, colorDepth, height, pixelDepth, width
[IMAGE]

JQuery & Ajax

JQuery

a library to make it easier to manipulate DOM
- traversal
- event handling
- animation
- Ajax
Syntax
- $(selector).action()
- $("#id"), $(".class"), $("tag")
- $("[attr]") to select all elements with a certain attr
- $("[attr=value]") to select all elements which attr = value
- $('this') to set current element
- like CSS
actions
- getter
  - read the selection
  - operate on the first element in the selection
- setter
  - change the selection
  - operate on all elements in the selection (implicit iteration)
  - return the selected element so they can be chained
Event delegation - [IMAGE]

Ajax

Asynchronized Javascript and XML
Name of a great person
An Ajax call:
1. User interaction invoke an event handler
2. Event handler create XMLHttpRequest obecjt
3. XMLGrrpRequest object requests a page from server
4. Server retrieves appropriate data based on the page requested and sent it back
5. XMLHttpRequest object fires a callback when data arrives, often a callback function
6. Callback event handler processes the data and updates the DOM accordingly
[IMAGE]

XML

usage
Webstore store data as XML files
- Databases that return query results as XML
- Web services that use XML to communicate
a universal format for exchange of data
can use schema or DTD to describe structure/markup
- standardize integrity and interoperability

JSON

language independent convention for formatting data as a set of JS objects
value can include an ordered list of values (array) Ajax and JSON
JSON.parse(string)
JSON.stringify(object)

Ajax and JQuery

$.ajax({
    url: "url",
    data: {},
    datatype: type,
    success: function() {
	       JQuery
       }
});

Forms and Validation, Cookies and Sessions

`<form>`

allow submission of data to the server
GET and POST
- GET: best for small amounts of insecure data.
  - Asks a server for a page or data
  - Parameters are sent in URL query (?name=value&name=value)
- POST: large chunks or sensitive data
  - Retrieves the server's response
  - Parameters are embedded in request's HTTP packet

URL encoding

Special characters will be encoded for URL query
Automatically encoded by browser

File Upload

<input type="file" name="avatar">

Form Validation

Ensuring the necessary values when the field is required
- Preventing blank
- Ensuring type of values
  - Format and range
- Ensuring confirmation fields fit together (retype password/email)
Approaches
- HTML 5 validation
- Client-side
- Server-side
Provide appropriates and useful feedback on front-end to end-users
- On-submit or on-the-fly
- Static hints beside fields
- Provide tooltips (on-hover tips)
- Provide dynamic tips (shown as user interacts with a field)

Distinguishing human/machine

CAPTCHA
- Completely Automated Public Turning test to tell computers and Humans Apart
- Problems easy for humans to solve, but hard/impossible for computers to solve
- Let to spam-sponsored CAPTCHA farms
reCAPTCHA
- Put all that free labor to good use
- Translate real words in images and archival texts
NoCAPTCHA
- Ask to click a box (I am not a robot)

Cookies and Sessions

HTTP simply allows request a single document from a web server, doesn't remember or keep track of anything between invocations (short-lived)
Every resource that is accessed via HTTP is a single, one-off request with no threaded connection between them
Need:
- A way to remember/track states
- Uniquely identify each client from the server
- A way of providing custom content for each client
Options:
- Client mechanisms:
  - Cookies
  - Hidden Variables
  - URL rewriting
  - HTML5 local storage (HTTP 1.1)
- Server mechanisms:
  - Session
Cookies
- Small piece of data sent by server to a browser, and sent back by browser on future page requests.
  - Authentication
  - User tracking
  - Personalization: Maintain user preferences, shopping carts, etc.
- Get/set cookie manually by:
  - document.cookie=""
  - Cookies.set("", "");
- Keep track of state on the client
- Mostly only visible to application
- HttpOnly: don't allow Javascript to manipulate cookies (but still may be able to read them or learn of their existence)
- Secure: Only send over HTTPS
- Doesn't seem to be best practices yet
- Lifetime
  - Session cookies by default are temporary cookie stored only in browser's memory. Erased when browser closed.
- Can't be used for long-term tracking
- Safer, because only the browser has access
  - Persistent cookies are stored in a file on the browser's computer and can track long-term info
- Potentially less secure because users/programs can open cookie file, see/change cookie values
  - Problems and Limitations
- Browsers can disable cookies.
- Users can delete and disable cookies.
- Size limit / expiration policy
- Security issue: stored in plaintext
- Privacy issue: ID of the users
- Not handling cookie expiry well
Hidden Variables
- Store state info in webpages
- Cross-browser support
- For form-based apps only - Change of URL losses the state - Irrespective of what was submitted previously
URLS
- Store state in the URL such that URL becomes a GET request
- Supported by all browsers
- Requires all URLs contain all state info
- Current submitted page represents current state
- Independent of what was done previously
- Example - [IMAGE]
Sessions:
- A server-side option
- Store the current states on the server
- Each request includes a token identifying browser's session - Tokens can be passed via cookies, hidden variables, URL rewriting - At each request, executing script uses the token to fetch the session state. - ##Session Hijacking
HTML5 local storage
- Store data with no expiration date
- localStorage.setItem("lastname", "Smith");
- localStorage,getItem("lastname");
session storage
- store data for one session (lost when browser tab is closed)

REST, NODE, Express

REST

REpresentational State Transfer
Architectural style for using HTTP to provide resources over the web
Focus on roles and actions
Uniquely access resources through URLs
Use GET, POST, PUT, DELETE
User standard data format: HTML, XML, JSON
Stateless protocol
Benefits
- Performance (light weight)
- Scalability due to client-server separation
- Simplicity (nouns and verbs)
- Visibility of communication
- Portability (platform independent)
- Reliability at the system level
REST verbs
- GET: Read a specific resource (by identifier)
- PUT: Update or create a specific resource (by identifier)
- DELETE: Remove a specific resource
- POST: Create or Update a resource
- Need two basic URLs per resource:
  - Collection of items in the resource
  - Select a resource
RESTful API design
- Use logical URLs that are human-understandable and don't point to a file
- If dealing with a lot of data provide a paging mechanism
- Document everything and provide instructions
- Use POST (not GET) to make a change
- Provide multiple output data formats (JSON, XML, CSV, RSS. HTML)
- Use authentication if your API allows change/deletion/adding
Server-side
- Process HTTP requests, and output a combination of HTML, JSON, JS to client

`node.js`

event-driven, I/O model-based runtime environment and library for developing server-side web apps using JS.
Threads

Event

Event Queue

Inner loop

while (true) {
        if (!eventQueue.notEmpty()) {
            eventQueue.pop().call();
        }
}

Get the same JS on browser and server
Don't need DOM on the server
Add events and an event queue, everything runs as a call from event loop. (See above)
Make event interface to all OS operations (???)
- Wrap all OS blocking calls
- Add some data handling support
Add a proper module system
- Each module gets its own scope
Module
- Import with:
  - System module: require(“module name”); // looks in nodes_module
  - From a file: require(“./^^^.js”); // reads specified file
  - From a directory: require(“./myModule”); // reads myModule/index.js
- Modules have private scope
- Require returns what is assigned to module.exports
- Many standard Node modules
- Huge library of module (npm)
- We use:
  - Express (framework)
  - Mongoose (MongoDB object modeling)
npm
- npm init
  - creates package.json
- npm install module –save
  - for any new modules you wanna install
.gitignore
- ignore files for git

Programming with events/callbacks

Threads: Blocking/waiting is transparent

r1 = step1();
console.log('step1 done', r1);
r2 = step2(r1);
console.log('step2 done', r2);
r3 = step3(r2);
console.log('step3 done', r3);
console.log('All Done!');

Events: Blocking/waiting requires callback

step1(function(r1) {
	console.log('s1 done', r1);
	step2(r1, function (r2) {
	    console.log('s2 done', r2);
	    step3(r2, function (r3) {
		console.log('s3done',r3);
		console.log('All Done!');
	    });
	});
});

Listener/emitter pattern

When programming with events, a listener/emitter is used.
Listener - Function to be called when the event is signaled
Emitter - Signal that an event has occurred

var events = require('events');
var myEmitter = new events.eventEmitter();
myEmitter.on('myEvent', function(param1, param2) {
        console.log('myEvent occurred with ' + param1 + 'and' + param2 + '!'); // like wait
    });
myEmitter.emit('myEvent', 'arg1', 'arg2'); // like signal

`express.js`

relatively thin layer on top of the base node.js functionality.

var express = require('express');
var expressApp = express();
expressApp.get('/', function (httpRequest, httpResponse) {
      httpResponse.send('hello world');
});
expressApp.listen(3000);

http methods:

expressApp.get(urlPath, requestProcessFunction);
expressApp.post(urlPath, requestProcessFunction);
expressApp.put(urlPath, requestProcessFunction);
expressApp.delete(urlPath, requestProcessFunction);
expressApp.all(urlPath, requestProcessFunction);

Can contain parameters (e.g. '/user/:user_id')

http req object
- req of expressApp.get('/user/:user_id', function (req, res)
- request.params - Object containing URL rout params (e.g. user_id)
- request.query - Object containing query params (e.g &foo=9 => {foo: 9})
- request.body - Object containing the parsed body
- request.get(field) - Returns the value of the specified HTTP header field
http res object
- res of expressApp.get('/user/:user_id', function (req, res)
- res.write(content) - Build up the response body with content
- res.status(code) - Set the HTTP status code of the reply
- res.set(prop, value) - set the response header property to value
- res.end() - End the request by responding it
- res.send(content) - Do write and End

Databases, MongoDB and Mongoose

Relational Databases

collection of tables with rows and columns
Each row represents a record
Each column represents an attribute of the records contained in the table
Why
- Data safety
- Concurrent access
- Fault tolerance
- Data integrity
- Scalability
- Reporting

ACID

Atomic
- All operations in a transaction complete, or none do
Consistent
- On completion of transaction, database is sound (?)
- Constraints of the database are applied and database is in a valid state
Isolated
- transactions don't interfere with each other
Durability
- results of a transaction are permanent even in the case of failures

SQL

Structured Query Language
A special purpose programming language
Data definition, manipulation, and controls.
- Insert, Query, Update, delete
Schema creation and modification
Examples:
- SQLite
- MySQL
- PostgreSQL
- Access
- PointBase
Keys
- Primary Key: organize data around accesses
  - Uniquely identifies a row in the table
- Secondary Key: Other columns that are having unique values
- Foreign Key: The Primary Key defined in another table
Schemas
- Define the structure of the database
  - tables, column indices
- Needs to be defined before adding data
- Not great match with agile development approaches (Each new feature may require a schema change)
  - Database migration allow incremental changes
- NoSQL databases are built to allow the insertion of data without a predefined schema

NoSQL

Do not use relational model or SQLite
- Flexible schema
- Quicker/cheaper to setup
- Scalability
- No declarative query language -> more programming
- Relaxed consistency
  - -> Higher performance and availability
  - -> fewer guarantees
Document types apply a key to a "document" with a complex data structure
- Contain many different key: value pairs
- Use standard data format (e.g. JSON, HTML)
- Can be organized by collection, tags, etc.

NoSQL vs Relational

Relational databases usually scale vertically
NoSQL databases usually support
- auto-sharding: natively and automatically store data across an arbitrary number of Servers
- automatic replication: High availability and disaster recovery without involving separate applications to manage these tasks
- caching: keep frequently used data in system memory and removing the need for a separate caching layer

BASE

Basic Availability
- Most of the database is available most of the time
Soft-state
- Stores don't have to be write consistent
Eventual consistency
- At some later point, data stores will be Consistent

MongoDB

NoSQL database uses a JSON-like (BSON) document oriented model
Data is stored in collections (rather than tables)
- Dynamic schema
- Works with many programming languages
- Caching: Most recent kept in RAM.
- No transactions, but allows atomic operations.
BSON
- Binary JSON
- MongoDB encodes JSON documents in binary format behind the scenes
- Extends JSON to provide data types
Document validation provided within the database

Connect to MongoDB instance

mongoose.connect('mongodb://localhost/myproject');

wait for connection to Complete

mongoose.connection.on('open', function ()  {
   // Can start processing model fetch requests
});
mongoose.connection.on('error', function (err) { });

Can also listen for connecting, connected, disconnecting, disconnected

schema

Defines collections
Types:
- String, Number, Data, Buffer, Boolean
- Array - e.g comments [ObjectId]
- ObjectID - reference to another object
- Mixed - anything

Defining:

var userSchema = new mongoose.Schema({
    first_name: String,
    last_name: String,
    emailAddresses: [String],
    location: String
});

Secondary indices
- faster query
- slower mutating operations: Add, delete, update must update indexes
- Uses more space
- When:
  - Common queries spend a lot of time scanning
  - Need to enforce uniqueness

Making model from schema

var User = mongoose.model('User', userSchema);

Making objects from model

User.create({ first_name: 'Amy', last_name: 'Pond'}, doneCallback);
function doneCallback(err, newUser) {
    assert (!err);
    console.log('Created object with ID', newUser._id);
}

Queries

User.find(function(err, users) {
    /* users is an array of objects */
});
User.findOne({key: value}, function(err, user) {
    /* user is an object */
})
User.findOne({key: value}, function(err, user) {
    // Update user object
    user.save();
})

var query = User.find({});
// Projection
query.select("first_name last_name")
      .exec(doneCallback);
// Sorting
query.sort("first_name").exec(doneCallback);
//Limits
query.limit(50).exec(doneCallback);
query.sort("-location");

// Deleting one
User.remove({_id: user_id}, function (err) { } );
// Deleting all
User.remove({}, function (err) { } );

CRUD

Create, Read, Update, delete
Simpler access model than SQL

Mongoose

Object Definition Language (ODL)

Web Architectures

Higher level structures underlying a web app
Made up of elements, their properties and relationships among elements

n-tier

separate the components of a web app into different tiers of layers
Components:
- presentation: the static or dynamically generated content rendered by the browser (front-end)
- processing logic: dynamic content processing and generation, e.g. using node.js, PHP, Java EE, ASP.NET
- data management: database, comprising data sets and data management system (back-end)
1-tier
- All three layers are on the same machine and presentation, logic and data are tightly connected
- Scalability: single processor, no separation, hard to scale
- Portability: Moving to a new machine, or changing anything may mean major re-writes.
- Maintenance: Changing one layer requires changing other layers
2-tier
- Database runs on a separated server
- Presentation and logic layers are tightly coupled
- Can easily switch to a different Database
- Coupling of presentation and logic can lead to heavy server load and network congestion
3-tier
- Each tier is separate with a clear interface between them
- Each tier can potentially run on a different machine
- client-server
- unconnected tiers should not communicate (in our project, client never communicates with database server directly)
- change in platform affects only that tier
Presentation Layer
- user interface and Interactions
- client-view or front-end
- should not contain business logic or data access code
Logic Layer
- Set of rules for processing the data and accommodates many individual users
- No Presentation or access code
Data Layer
- Physical storage for data Persistence
- Manages access to the DB or file system
- Also called back-end
Benifites
- Easier Maintenance
- Reusable Components
- Faster development

MVC

Model View Controller
- User uses Controller
- Controller manipulates Model
- Model updates View
- View seen by User
Model manages application state by responding to reqs for info about its state (from view) or instructions to change state (from controller)
- Database
- Session info
- rules governing transaction
View renders the model into a form suitable for interaction (UI). Multiple views can exist for a single model give different contexts
- front-end website (HTML, CSS, and server-side templates)
Controller receives user input and initiates a response by making updates to the state of objects in the model and selecting a view for the response
- Client-side scripting that manages user interactions, HTTP request processing and business logic preprocessing
Benefits:
- Clarity of design
- Separation of concerns
- Parallel development
- Distributable

3-tier vs MVC

communication
- 3-tier:
  - Presentation Layer never communicates directly with data layer (only through logic layer)
- MVC
  - All layers communicate directly
Usage
- 3-tier
  - Client, middleware and data tiers are on physically separate platforms
- MVC
  - model, view and controller are together

React

Templates

Mustache, Pug (Jade), EJS, Handlebars, (Our project used nunjucks)...
Move Javascript out of HTML
Separate logic and display
Create a readable, maintainable language to write views
Modularize views to reuse pieces
User variables in HTML

Security

Goals
- Confidentiality
- integrity
- availability
Risks
- Financial
- Reputation
- physical
Threats
- Insiders
- Criminals
- Commercial competitors
- Nation-states
- Law Enforcement
- Vandals

Attacks

Directly on system:
- Stealing data, passwords, credit card Number
- defacing, DOS (denial of service), link spam
On users
- cross site scripting, request forgery (CSRF), Man-In-The-Middle (MITM), profiling
Both
- Hosting bad content, "drive-by download"
Neither
- Ad-based malware

Transport Layer Security (TLS)

Security mechanism underlying HTTPS
Often called SSL
Client and server use public-key encryption on shared per-session secret, then use secret to encrypt session data

Authentication

Always store passwords salted & hashed, use trusted algorithms (we used passport in our project)

Injection

SQL Injection:

Example 1

String query = "SELECT * FROM accounts WHERE custID='" + request.getParameter("id") + "'";

With a input of foo' or 'x'='x will form

String query = "SELECT * FROM accounts WHERE custID=' foo' or 'x'='x '";

Which returns all customer information.

Example 2

SELECT email, passwd, login_id, full_name
FROM members
WHERE email = '?';

When replacing ? with x';UPDATE membersSET email = '[email protected]' WHERE email = '[email protected] will result

SELECT email, passwd, login_id, full_name
FROM members
WHERE email = 'x';
    UPDATE members
    SET email = '[email protected]'
    WHERE email = '[email protected]';

Which replaces original email information with '[email protected]'.

Prevention:

User parameterized Queries
Escape everything
Validate input
Never trust raw input

Auth and Sessions

Vulnerabilities

User credentials not stored using hashing or encryption
Credentials can be guessed or overwritten
Session IDs exposed in URL
Session IDs don't timeout
Auth tokens not invalidated on log out
Passwords, session IDs sent over unencrypted Connections

OAuth

Auth framework that delegates user authentication to a service that hosts the user account
Must register app with the auth service, including the URL to redirect to
Auth service redirects to a registered URL with an authorization code

Cross-Site scripting

Data enters web application and is included in dynamic content sent to a web user without being validated for malicious content.
Usually JS but may also include HTML and other Data
Types (3):
- stored
  - injected script is permanently stored on server
- reflected
- DOM-based

Prevention:

Escape all untrusted data

Insecure Direct Object reference

Attacker is an authorized user
Attacker can gain access to objects by guessing parameters

Prevention:

Ensure user is authorized for access

Security Misconfiguration

Software out of date
Unnecessary features enabled
default accounts and passwords still enabled / unchanged
error handling reveal stack traces or overly informative error messages sent to users
Security settings in development frameworks not set to secure values

Sensitive Data Exposure

Sensitive data:

passwords
credit cards
personal info

Prevention:

Encrypt all sensitive data

Missing Function Level Access Control

Modify URL to gain unauthorized Access
Internal ids appear in URLs

Prevention:

Check access authorization on every object
Not sufficient to simply not show privileged operations to unprivileged users in the UI

Cross-Site Request forgery

Some Content on unrelated site includes a POST to app
If a user of the app navigates to compromised site while logged into the app, malicious POST request can pretend to be the user and steal the user's info from app

Prevention:

Include unpredictable token with each HTTP request (usually in a hidden field)

Using Components with known security Vulnerabilities

Dev team / Dev Ops people must be vigilant
Be careful what you include in your app
Update software always

Unvalidated redirects and Forwards

Apps user redirects or internal forwards where unvalidated parameters are used

Promises

Callback function have been the main mechanism for managing asynchronous programming
Callbacks can be hard to trance and reason about
Promises are a different type of abstraction for managing asynchronous programming

Terminology

Promise is an object or function with a then method whose behavior confirms its specification
thenable is an object or function that defines a then method
value is any legal JS value
exception is a value that is thrown using the throw statement
reason is a value that indicates why a promise was rejected
States: pending, fulfilled, rejected
settled: fulfilled or rejected

`.then`

Registers a callback to receive either a promise's eventual value, or the reason it cannot be fulfilled

returns a promise

myPromise.then(handleResolve, handleReject);
function handleResolve(data) {
    //handle success
}
function handleReject(error) {
    //handle failure
}

Name		Name	Last commit message	Last commit date
Latest commit History 22 Commits
assets/images		assets/images
views		views
.gitignore		.gitignore
README.md		README.md
function_call_order.js		function_call_order.js
package.json		package.json
routes.js		routes.js
server.js		server.js

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CSC309 Review

HTML, CSS

URL:

HTML

HTML5

CSS

Elements

CSS box model

HTTP, Servers

HTTP

Javascript and DOM

Javascript:

IIFE:

Anonymous functions:

Closure:

Objects:

this:

Explicit binding:

DOM

BOM

JQuery & Ajax

JQuery

Ajax

XML

JSON

Ajax and JQuery

Forms and Validation, Cookies and Sessions

<form>

URL encoding

File Upload

Form Validation

Distinguishing human/machine

Cookies and Sessions

REST, NODE, Express

REST

node.js

express.js

Databases, MongoDB and Mongoose

Relational Databases

ACID

SQL

NoSQL

NoSQL vs Relational

BASE

MongoDB

schema

CRUD

Mongoose

Web Architectures

n-tier

MVC

3-tier vs MVC

React

Templates

Security

Security

Attacks

Transport Layer Security (TLS)

Authentication

Injection

Auth and Sessions

OAuth

Cross-Site scripting

Insecure Direct Object reference

Security Misconfiguration

Sensitive Data Exposure

Missing Function Level Access Control

Cross-Site Request forgery

Using Components with known security Vulnerabilities

Unvalidated redirects and Forwards

Promises

Terminology

.then

About

Resources

`<form>`

`node.js`

`express.js`

`.then`

Packages