1. اگر از JWE استفاده نمی‌کنید، بهتر است اطلاعات حساسی مانند شماره تلفن کاربر (و شاید در مواردی حتی آیدی کاربر) را در بدنه توکن قرار ندهیم چرا که قابل خوانده شدن است (که در این صورت استفاده از Guid برای آیدی کاربر می تواند کمی مفید باشد چرا که حداقل آیدی بقیه کاربران قابل پیش بینی نمی‌باشد).
   
2. توکن JWT هیچ امنیتی در برابر خوانده شدن ندارد؛ ولی به لطف امضای (signature) آن، در برابر تغییر محتوا، ایمن است؛ چرا که در صورت تغییر محتوای آن، دیگر مقدار hash محتوا با امضای آن همخوانی نداشته و عملا از اعتبار ساقط می‌گردد.

var secretKey = Encoding.UTF8.GetBytes("LongerThan-16Char-SecretKey"); // must be 16 character or longer 
var signingCredentials = new SigningCredentials(new SymmetricSecurityKey(secretKey), SecurityAlgorithms.HmacSha256Signature);

var encryptionkey = Encoding.UTF8.GetBytes("16CharEncryptKey"); //must be 16 character
var encryptingCredentials = new EncryptingCredentials(new SymmetricSecurityKey(encryptionkey), SecurityAlgorithms.Aes128KW, SecurityAlgorithms.Aes128CbcHmacSha256);

var claims = new List<Claim>
{
   new Claim(ClaimTypes.Name, "UserName"), //user.UserName
   new Claim(ClaimTypes.NameIdentifier, "123"), //user.Id
};

var descriptor = new SecurityTokenDescriptor
{
   Issuer = _siteSetting.JwtSettings.Issuer,
   Audience = _siteSetting.JwtSettings.Audience,
   IssuedAt = DateTime.Now,
   NotBefore = DateTime.Now.AddMinutes(_siteSetting.JwtSettings.NotBeforeMinutes),
   Expires = DateTime.Now.AddMinutes(_siteSetting.JwtSettings.ExpirationMinutes),
   SigningCredentials = signingCredentials,
   EncryptingCredentials = encryptingCredentials,
   Subject = new ClaimsIdentity(claims)
};

var tokenHandler = new JwtSecurityTokenHandler();
var securityToken = tokenHandler.CreateToken(descriptor);
string encryptedJwt = tokenHandler.WriteToken(securityToken);

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
.AddJwtBearer(options =>
{
   var secretkey = Encoding.UTF8.GetBytes("LongerThan-16Char-SecretKey");
   var encryptionkey = Encoding.UTF8.GetBytes("16CharEncryptKey");

   var validationParameters = new TokenValidationParameters
   {
      ClockSkew = TimeSpan.Zero, // default: 5 min
      RequireSignedTokens = true,

      ValidateIssuerSigningKey = true,
      IssuerSigningKey = new SymmetricSecurityKey(secretkey),

      RequireExpirationTime = true,
      ValidateLifetime = true,

      ValidateAudience = true, //default : false
      ValidAudience = "MyWebsite",

      ValidateIssuer = true, //default : false
      ValidIssuer = "MyWebsite",

      TokenDecryptionKey = new SymmetricSecurityKey(encryptionkey)
   };

   options.RequireHttpsMetadata = false;
   options.SaveToken = true;
   options.TokenValidationParameters = validationParameters;
});

{
  "alg": "A128KW",
  "enc": "A128CBC-HS256",
  "typ": "JWT"
}

version: '3'
networks:
  shared-network:
services:
  nodeapp1:
    image: nodeapp1
    build:
      context: nodeapp1
      dockerfile: dockerfile
    ports:
     - "8181:80"
    networks:
     - shared-network
  nodeapp2:
    image: nodeapp2
    build:
      context: nodeapp2
      dockerfile: dockerfile
    ports:
     - "8182:80"
    networks:
     - shared-network
  mongo:
    image: mongo
    ports:
      - "27017:27017"
    networks:
      - shared-network

 docker-compose build

 docker-compose up

 docker-compose down

 docker-compose stop

 docker-compose start

 docker-compose run --build

FROM node
COPY . /var/www
WORKDIR /var/www
RUN npm i
EXPOSE 80
ENTRYPOINT node index

const express = require('express');
const fetch = require('node-fetch');
const app = express();

app.get('/', async (req, res) => {
    let response = await fetch("http://nodeapp2/");
    text = await response.text();
    res.send(text);
})

app.listen(80, () => console.log(`listening on port 80!`))

 version: '3'

services:
nodeapp1:
  environment:
- PRODUCTION: 'true'
nodeapp2:
  environment:
- PRODUCTION: 'true'

 docker-compose -f docker-compose.yml -f docker-compose.prod.yml up

DECLARE @s VARCHAR(50) = '~~~~~~!@@@@@@@ salam';
SET @s = REPLACE(REPLACE(REPLACE(@s, '~', ''), '!', ''), '@', '');
SELECT @s AS new_string

CREATE TABLE test_string
(id integer not null primary key,
 string_value varchar(500) not null);
 
INSERT INTO test_string
VALUES (1, '@@@@ #### salam 12345'),
       (2, 'good $$$$$ &&&&&& bye 00000');

WITH CTE (ID, MyString, Ix) AS
(
    SELECT id,
           string_value,
           PATINDEX('%[^a-z ]%', string_value)                   
    FROM   test_string
     
    UNION ALL
     
    SELECT id,
           CAST(REPLACE(MyString, SUBSTRING(MyString,Ix , 1), '') AS VARCHAR(500)),
           PATINDEX('%[^a-z ]%', REPLACE(MyString, SUBSTRING(MyString,Ix , 1), ''))
    FROM   CTE
    WHERE  Ix > 0
)
SELECT *
FROM   cte
--WHERE  Ix = 0;
ORDER BY id, CASE WHEN Ix = 0 THEN 1 ELSE 0 END, Ix;

 InteractiveViews
                .SetViewCacheFactory(ctx, new FileViewCacheFactory(new FileInfo(Assembly.GetExecutingAssembly().Location).DirectoryName + @"\EF6PrecompiledViews.xml"));

npm install -g eslint

eslint --init

? How would you like to configure ESLint? Answer questions about your style
? Are you using ECMAScript 6 features? Yes
? Are you using ES6 modules? Yes
? Where will your code run? Browser, Node
? Do you use CommonJS? No
? Do you use JSX? No
? What style of indentation do you use? Spaces
? What quotes do you use for strings? Double
? What line endings do you use? Windows
? Do you require semicolons? Yes
? What format do you want your config file to be in? JSON
Successfully created .eslintrc.json file in D:\ali\electron

eslint .
یا
eslint index.js

{
  "name": "electron",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "start": "electron .",
    "test":"eslint ."
  },
  "author": "",
  "license": "ISC"
}

npm test

D:\ali\electron\index.js
   1:26  error  Strings must use doublequote                            quotes
  16:8   error  Strings must use doublequote                            quotes
  19:3   error  Expected indentation of 4 space characters but found 2  indent
  22:3   error  Expected indentation of 4 space characters but found 2  indent

✖ 4 problems (4 errors, 0 warnings)

setText('test');
getText();

.text([text]);

• تنها caller از پایان یافتن عملیات غیرهمزمان مطلع خواهد شد.
  
• هندل کردن خطا و همچنین مدیریت چندین عملیات asynchronous به صورت همزمان خیلی سخت خواهد بود.
  

function getCompanyFromOrderId(orderId) {
    getOrder(orderId, function(order) {
        getUser(order.userId, function(user) {
            getCompany(user.companyId, function(company) {
                // do something with company
            });
        });
    });
}

function getCompanyFromOrderId(orderId) {
    try {
        getOrder(orderId, function (order) {
            try {
                getUser(order.userId, function (user) {
                    try {
                        getCompany(user.companyId, function (company) {
                            try {
                                // do something with company
                            } catch (ex) {
                                // handle exception
                            }
                        });
                    } catch (ex) {
                        // handle exception
                    }
                });
            } catch (ex) {
                // handle exception
            }
        });
    } catch (ex) {
        // handle exception
    }
}

function getCompanyFromOrderId(orderId) {
    getOrder(orderId).then(function(order) {
        return getUser(order.orderId);
    }).then(function(user) {
        return getCompany(user.companyId);
    }).then(function(company) {
        // do something with company
    }).then(undefined, function(error) {
        // handle error
    })
}

var promise = new Promise(function(resolve, reject) {
  // انجام یکسری عملیات به عنوان مثال دریافت اطلاعات از سرور و...

  if (/* اگر کدهای فوق با موفقیت انجام شدند */) {
    resolve("عملیات با موفقیت انجام پذیرفت");
  }
  else {
    reject(Error("خطایی رخ داده است"));
  }
});

promise.then(function(result) {
  console.log(result); // "عملیات با موفقیت انجام پذیرفت "
}, function(err) {
  console.log(err); // Error: "خطایی رخ داده است"
});

function get(url){
    return new Promise(function(resolve, reject) {
       $.get(url, function(data) {
           resolve(data);
       }) 
       .fail(function(){
          reject(); 
       });
    });
}

get('users.all').then(function(users){
    myController.users = users;
}, function(){
   delete myController.users; 
});

get('users.all').then(function(users){
    myController.users = users;
})
.catch(function(){
    delete myController.users;
});

var usersPromise = get('users.all');
var postsPromise = get('posts.everyone');

Promise.all([usersPromise, postsPromise])
.then(function(result){
    myController.users = result[0];
    myController.posts = result[1];
}, function(){
   delete myController.users;
   delete myController.posts; 
});

get('users.all').then(function(usersString){
    return JSON.parse(usersString);
}).then(function(users){
   myController.users = users; 
});

get('users.all').then(JSON.parse).then(function(users){
   myController.users = users; 
});

• id
• name
• price