JavaScript Code Snippets
Buy production-ready JavaScript code on SnippetX. Every JavaScript snippet is hand-crafted by developers and verified before listing — from reusable components and utilities to complete integrations. Download instantly after purchase and ship faster.
20 JavaScript snippets available right now.
Express Health Checker
Health check endpoints with dependency monitoring, readiness probes, and Prometheus metrics.
Node.js Config Manager
Environment-aware configuration with validation, secrets management, and hot reloading.
Express Rate Limiter Pro
Advanced rate limiting with sliding window, IP blocking, user-based limits, and Redis backing.
Node.js Crypto Utils
Encryption, hashing, JWT helpers, and password utilities with bcrypt and argon2 support.
Express CORS Manager
Dynamic CORS configuration with origin whitelisting, credentials, and preflight caching.
Node.js Stream Utils
Stream utilities: pipeline, transform, merge, split, and backpressure handling for Node.js streams.
Express Router Factory
Auto-generate Express routes from schema definitions with validation, auth, and pagination.
Node.js HTTP Client
Axios wrapper with retry logic, request/response interceptors, caching, and timeout handling.
Express Error Handler
Centralized error handling with custom error classes, validation errors, and structured error responses.
Node.js Cache Middleware
HTTP cache middleware with ETags, conditional requests, and Redis-backed distributed caching.
Express Session Manager
Session management with Redis store, CSRF protection, secure cookies, and session fixation prevention.
Node.js Logger Utils
Structured logging with Winston, log rotation, request correlation, and custom transports.
Express Validator Pack
Request validation middleware with Joi, custom validators, sanitizers, and error formatting.
Node.js Queue System
In-memory job queue with retry logic, delayed jobs, priority queues, and concurrency control.
Express API Boilerplate
Production-ready Express API starter with middleware chain, error handling, logging, rate limiting, and Swagger docs.
WebSocket Chat Server
Real-time chat server with rooms, typing indicators, message history, and presence tracking. Built with Socket.io.
Node.js File Upload Handler
Production-ready file upload middleware for Express/Multer with: file type validation, size limits, virus scanning integration.
Express Rate Limiter & Security Pack
Production-ready Express security middleware bundle: rate limiting, CORS hardening, helmet config, SQL injection prevention, XSS filtering.
SQL Query Builder
Lightweight SQL query builder for Node.js with SELECT, INSERT, UPDATE, DELETE, JOINs, and parameterized queries. Zero dependencies.
Auth Middleware Suite
Pre-built authentication middleware for Express/Fastify with JWT & OAuth support. Includes rate limiting, refresh token rotation, and RBAC.