Express.js Snippets & Code Examples

What is Express.js?

The battle-tested standard. Middleware and controllers compatible with Express 4 and 5.

Use the snippets below to quickly add common functionality to your Express.js applications. All snippets are production-ready and can be copied directly into your project.

Popular Features

Express Server
HTTP Server
Zod-Swagger Helper
Swagger JSDoc
JWT Authentication
API Key Authentication

Libraries

Core libraries and service integrations

6 snippets

Express Server

Production-ready Express HTTP server with graceful shutdown

HTTP Server

Basic HTTP server with Express integration

Socket.io Server

Real-time WebSocket server with optional JWT auth

Documentation

API documentation and specification tools

3 snippets

Zod-Swagger Helper

Programmatic OpenAPI documentation with Zod

Swagger JSDoc

API documentation using JSDoc and Swagger UI

OpenAPI Validator

Contract-first validation and documentation

Middleware

Reusable Express middleware

11 snippets

JWT Authentication

JWT middleware with role-based access

API Key Authentication

API key auth for service-to-service

Winston Logger

Structured logging with Winston

Utilities

Standalone utility functions

7 snippets

Encryption Utilities

AES-256-GCM encryption/decryption

Pagination Helpers

Offset and cursor-based pagination

Slug Generator

URL-safe slug generation

Routes

Pre-built route handlers

1 snippets

Health Check Routes

Liveness and readiness endpoints

Getting Started

Install the Hanma CLI to add snippets to your project:

npx hanma add  --framework express

Or browse the categories above to find the snippet you need.