Express

What it does

The Express skill enables AI agents to build Node.js HTTP servers using the Express framework. It streamlines API development by automating tasks like configuring middleware (CORS, body parsing, helmet), defining routes with request validation and response formatting, adding error handling, and setting up security headers for production-ready applications. This ultimately speeds up backend development workflows.

When to use it

• Building Node.js HTTP servers with Express routing and middleware.
• Creating REST APIs that require request validation and formatted responses.
• Setting up production-ready Express applications, including configuring security headers.
• Handling CORS, body parsing, error handling, and static files within an application.

Key capabilities

• Instantiates Express applications and configures middleware (helmet, cors, express.json).
• Defines route handlers for endpoints.
• Implements error middleware for consistent responses.
• Provides an asynchronous error wrapper (asyncHandler) to catch rejected promises in route handlers.
• Supports setting up routing using the Express Router object.

Example prompts

• "Create a simple Express server with a GET endpoint at /api/items that returns data from a database."
• "Set up CORS and body parsing middleware for my Express application."
• "Implement error handling in my Express app to return consistent JSON responses."

Tips & gotchas

• The skill assumes familiarity with Node.js and basic programming concepts.
• Error middleware must be defined with four parameters (err, req, res, next) to function correctly.
• The provided example code uses Item, User which are assumed database models; ensure these are properly configured for the skill to work as intended.