Build production-ready Express.js servers with middleware, authentication, routing, and database integration. Use when creating REST APIs, managing requests/responses, implementing middleware chains, and handling server logic.
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See how to installReview the instructions the agent will receive before you install.
Create robust Express.js applications with proper routing, middleware chains, authentication mechanisms, and database integration following industry best practices.
Minimal working example:
const express = require('express');
const app = express();
const PORT = process.env.PORT || 3000;
// Middleware
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
// Routes
app.get('/health', (req, res) => {
res.json({ status: 'OK', timestamp: new Date().toISOString() });
});
// Error handling
app.use((err, req, res, next) => {
console.error(err.stack);
res.status(err.status || 500).json({
error: err.message,
requestId: req.id
});
});
app.listen(PORT, () => {
console.log(`Server running on port ${PORT}`);
});
Detailed implementations in the references/ work:
| Guide | Contents |
|---|---|
| Basic Express Setup | Basic Express Setup |
| Middleware Chain Implementation | Middleware Chain Implementation |
| Database Integration (PostgreSQL with Sequelize) | Database Integration (PostgreSQL with Sequelize) |
| Authentication with JWT | Authentication with JWT |
| RESTful Routes with CRUD Operations | RESTful Routes with CRUD Operations |
| Error Handling Middleware | Error Handling Middleware |
| Environment Configuration | Environment Configuration |
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Audit and improve web accessibility following WCAG 2.2 guidelines. Use when asked to "improve accessibility", "a11y audit", "WCAG compliance", "screen reader support", "keyboard navigation", or "make accessible".
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Answer questions about the AI SDK and help build AI-powered features. Use when developers: (1) Ask about AI SDK functions like generateText, streamText, ToolLoopAgent, embed, or tools, (2) Want to build AI agents, chatbots, RAG systems, or text generation features, (3) Have questions about AI providers (OpenAI, Anthropic, Google, etc.), streaming, tool calling, structured output, or embeddings, (4) Use React hooks like useChat or useCompletion. Triggers on: "AI SDK", "Vercel AI SDK", "generateText", "streamText", "add AI to my app", "build an agent", "tool calling", "structured output", "useChat".
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Configure Better Auth server and client, set up database adapters, manage sessions, add plugins, and handle environment variables. Use when users mention Better Auth, betterauth, auth.ts, or need to set up TypeScript authentication with email/password, OAuth, or plugin configuration.
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Deploy applications and websites to Vercel. Use when the user requests deployment actions like "deploy my app", "deploy and give me the link", "push this live", or "create a preview deployment".
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Configure email verification, implement password reset flows, set password policies, and customise hashing algorithms for Better Auth email/password authentication. Use when users need to set up login, sign-in, sign-up, credential authentication, or password security with Better Auth.
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Repo-specific guide to the Ever Works monorepo (ever-works/ever-works) — its pnpm + Turborepo layout, the per-workspace test runners (Jest vs Vitest vs Playwright), file-naming and import-alias conventions, the commit/branch model, and the real build/lint/type-check commands. Use this whenever working anywhere in this repository so changes match the codebase's actual conventions and pass CI.
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