Gaurav8757

Redis Methods:

Single key-value pairs set/get karne ke liye use hota hai.

-- set/get => data store in string format

-- hset/hget/hgetall:

• Data store in Object format
• Used in store userProfile to get data fast not db calls and if any update invalidate data.

Gaurav8757

Approach 1: Client-side logout (Simple)

• Token delete karo
• Cookie clear karo

• Small projects me common hai.

Approach 2: Token Blacklisting (Enterprise)

Logout ke time:

Gaurav8757

// Best approach:

// OTP send API se initial TTL le lo.
// Frontend me local countdown chalao.
// Jab page refresh ho ya component remount ho tab TTL API hit karo.

// Backend API

// send otp
app.post("/otp/send", async (req, res) => {

Gaurav8757

1. Create SSH key pair (Private & Public keys) using "ssh-keygen" on your local system.

1. Open Terminal

2. Run the following command:

ssh-keygen -t ed25519 -C "your_email@example.com"

If your system doesn’t support ed25519, use RSA:

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"

Gaurav8757

To use Sequelize ORM with Node.js for database operations including models, migrations, associations, queries, and transactions with PostgreSQL, MySQL, or SQLite.

It provides a clean API for database operations with support for migrations, associations, and transactions.

Installation

# Sequelize core

npm install sequelize

Gaurav8757

Foundation OF Redis

Database	Library	“new keyword”	Reason
MongoDB	Mongoose	❌ Required नहीं	mongoose.connect() खुद client बना देता है
MongoDB	Custom Mongoose	✔ Required	const customMongoose = new mongoose.Mongoose(); आपको नया independent client चाहिए होता है
Redis	ioredis	✔ Required	const redis = new Redis(); // <- NEW keyword required Redis client एक class instance होता है
Redis	redis (legacy)	✔ Required	वही reason — class instance

Gaurav8757

ICONS8 IMAGE API

https://img.icons8.com/3d-fluency/200/touch-id.png

Gaurav8757

See Examples: -url: https://www.prisma.io/docs/prisma-orm/quickstart/postgresql

DIRECT_URL to create table (Migration)

DIRECT_URL="postgres://USER:PASSWORD@db.prisma.io:5432/postgres?sslmode=require" 

DATABASE_URL to query with db (Queries)!

DATABASE_URL="postgres://USER:PASSWORD@pooled.db.prisma.io:5432/postgres?sslmode=require"

Gaurav8757

1. Open CMD as administrator
2. taskkill /F /IM mysqld.exe  >> ERROR: The process "mysqld.exe" not found.

Step_1 >> cd "C:\Program Files\MySQL\MySQL Server 8.0\bin"
Step_2 >> mysqld --initialize-insecure    // Initialize(fresh setup)
Step_3 >>  mysqld --install MySQL80      // service installed
Step_4 >> net start MySQL80              // start services
Step_5 >> mysql -u root                  // login to mysql
Step_6 >> ALTER USER 'root'@'localhost' IDENTIFIED BY 'root123';   // Password set karo
Step_7 >>

Gaurav8757

// 1. converts the incoming data into a JavaScript object and makes it accessible through req.body
// 2. { extended: true } is set, it supports  >> nested objects and arrays << using the qs library.
// 3. It only parses requests with Content-Type: application/x-www-form-urlencoded, ignoring other data formats.
app.use(express.urlencoded({ extended: true }))
app.get('/login', (req, res) => {
    res.send('<form method=POST action=/login><input type=text name=username><input type=number name=age><input type=submit></form>')
})


express.raw() function: It parses incoming request payloads into a >> Buffer << and is based on body-parser.