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NodeJS Installation step-by-step:
- Install curl
sudo apt-get install curl
- Install nvm
curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v0.39.1/install.sh | bash
- Verify installation
command -v nvm prompt should return nvm, if not close your current terminal, reopen it, and try again
- Install the current stable LTS release of Node.js
nvm install --lts
Usefull commands:
- List what versions of Node are installed
nvm ls
- Check node version
node --version
- Check npm version
npm --version
Create React App:
- Start a new Create React App project with TypeScript
npx create-react-app my-app --template typescript
Running the application
npm start
Material UI Installation
npm install @mui/material @emotion/react @emotion/styled
Roboto font Installation
npm install @fontsource/roboto
Icons Installation
npm install @mui/icons-material
Import Icon
import IconNameIcon from '@mui/icons-material/IconName';
Colors theme Installation
npm install material-ui-colors
Create a new Nest project
npm i -g @nestjs/cli
nest new project-name
Running the application
- To watch for changes in your files
npm run start
- Command will watch your files, automatically recompiling and reloading the server
npm run start:dev
Benefits achieved by dividing the software into layers:
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Independent of Frameworks. The architecture does not depend on the existence of some library of feature laden software. This allows you to use such frameworks as tools, rather than having to cram your system into their limited constraints.
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Testable. The business rules can be tested without the UI, Database, Web Server, or any other external element.
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Independent of UI. The UI can change easily, without changing the rest of the system. A Web UI could be replaced with a console UI, for example, without changing the business rules.
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Independent of Database. You can swap out Oracle or SQL Server, for Mongo, BigTable, CouchDB, or something else. Your business rules are not bound to the database.
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Independent of any external agency. In fact your business rules simply don’t know anything at all about the outside world.
Nest.js layer architecture
Cross-origin resource sharing (CORS) is a mechanism that allows restricted resources on a web page to be requested from another domain outside the domain from which the first resource was served.
CORS defines a way in which a browser and server can interact to determine whether it is safe to allow the cross-origin request. It allows for more freedom and functionality than purely same-origin requests, but is more secure than simply allowing all cross-origin requests.
From wikipedia
Enable Cors in Nest.js
To enable CORS, call the enableCors() method on the Nest application object:
const app = await NestFactory.create(AppModule);
app.enableCors();
await app.listen(3000);@JoinColumn must be set only on one side of relation - the side that must have the foreign key in the database table
Encryption is the process of encoding information.
This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext.
Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information. Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor. Encryption is a two-way function; what is encrypted can be decrypted with the proper key.
Hashing is the process of converting a given key into another value. A hash function is used to generate the new value according to a mathematical algorithm. Once hashing has been done, it should be impossible to go from the output to the input.