Code Snippet Library

const session = require('express-session');
const RedisStore = require('connect-redis').default;
const { createClient } = require('redis');

const { Server } = require('socket.io');
const jwt = require('jsonwebtoken');

const cron = require('node-cron');

class CronManager {

# docker-compose.yml - Full Stack Production Setup
version: '3.8'

const fs = require('fs');
const path = require('path');

/**
 * Paginate a Mongoose model with filtering, sorting, and search
 * @param {Model} model - Mongoose model

import { z } from 'zod';

// User registration schema with custom validators

import { useState, useEffect, useRef, useCallback } from 'react';

// Debounce hook - delays value updates

/* Dark Mode Toggle using CSS Custom Properties */
:root {
    --bg-primary: #0a0d12;

/* Glassmorphism Card Component */
.glass-card {
    position: relative;

/* Responsive Grid System with CSS Grid */
.grid {
    display: grid;

/* Custom Scrollbar Styles - Cross Browser */

/* === Webkit (Chrome, Safari, Edge) === */

#!/bin/bash
# Docker Cleanup Script - removes unused resources safely
set -euo pipefail

#!/bin/bash
# SSL Certificate Auto-Renewal with notifications
set -euo pipefail

#!/bin/bash
# MongoDB Backup Script with rotation and S3 upload
set -euo pipefail

#!/bin/bash
# PM2 Zero-Downtime Deployment Script
set -euo pipefail

#!/bin/bash
# Log Rotation Script with compression and retention
set -euo pipefail

-- User Analytics: Cohort retention, activity metrics, and growth
-- Works with PostgreSQL 12+

-- Efficient Pagination Patterns for PostgreSQL
-- Avoid OFFSET for large tables; use keyset pagination instead

-- PostgreSQL Full-Text Search with ranking and highlights

-- Enable required extensions

-- PostgreSQL Index Optimization Toolkit

-- 1. Find missing indexes (tables with sequential scans)

interface ApiResponse<T> {
    data: T;
    status: number;

import requests
from bs4 import BeautifulSoup
import time

import pandas as pd
from pathlib import Path
from typing import Dict, List, Optional, Callable

import requests
from requests.adapters import HTTPAdapter
from urllib3.util.retry import Retry

import smtplib
from email.mime.text import MIMEText
from email.mime.multipart import MIMEMultipart

from selenium import webdriver
from selenium.webdriver.chrome.options import Options
from selenium.webdriver.common.by import By

const mongoose = require('mongoose');

const MAX_RETRIES = 5;

class AppError extends Error {
    constructor(message, statusCode, code = 'INTERNAL_ERROR') {
        super(message);

class SlidingWindowRateLimiter {
    constructor({ windowMs = 60000, maxRequests = 100 } = {}) {
        this.windowMs = windowMs;

const multer = require('multer');
const path = require('path');
const crypto = require('crypto');

const jwt = require('jsonwebtoken');

const authenticate = (req, res, next) => {