Backend API design, database architecture, microservices patterns, and test-driven development. Use for designing APIs, database schemas, or backend system architecture.
npxskills add skillcreatorai/ai-agent-skills--skill backend-developmentLoading…
GET /users # List users
POST /users # Create user
GET /users/:id # Get user
PUT /users/:id # Update user (full)
PATCH /users/:id # Update user (partial)
DELETE /users/:id # Delete user
GET /users/:id/posts # List user's posts
POST /users/:id/posts # Create post for user
{
"data": { ... },
"meta": {
"page": 1,
"per_page": 20,
"total": 100
}
}
{
"error": {
"code": "VALIDATION_ERROR",
"message": "Invalid input",
"details": [
{ "field": "email", "message": "Invalid format" }
]
}
}
-- Use UUIDs for public IDs
CREATE TABLE users (
id SERIAL PRIMARY KEY,
public_id UUID DEFAULT gen_random_uuid() UNIQUE,
email VARCHAR(255) UNIQUE NOT NULL,
created_at TIMESTAMPTZ DEFAULT NOW(),
updated_at TIMESTAMPTZ DEFAULT NOW()
);
-- Soft deletes
ALTER TABLE users ADD COLUMN deleted_at TIMESTAMPTZ;
-- Indexes
CREATE INDEX idx_users_email ON users(email);
CREATE INDEX idx_users_created ON users(created_at DESC);
-- Pagination with cursor
SELECT * FROM posts
WHERE created_at < $cursor
ORDER BY created_at DESC
LIMIT 20;
-- Efficient counting
SELECT reltuples::bigint AS estimate
FROM pg_class WHERE relname = 'users';
interface TokenPayload {
sub: string; // User ID
iat: number; // Issued at
exp: number; // Expiration
scope: string[]; // Permissions
}
function verifyToken(token: string): TokenPayload {
return jwt.verify(token, SECRET) as TokenPayload;
}
async function authenticate(req: Request, res: Response, next: Next) {
const token = req.headers.authorization?.replace('Bearer ', '');
if (!token) {
return res.status(401).json({ error: 'Unauthorized' });
}
try {
req.user = verifyToken(token);
next();
} catch {
res.status(401).json({ error: 'Invalid token' });
}
}
// Cache-aside pattern
async function getUser(id: string): Promise<User> {
const cached = await redis.get(`user:${id}`);
if (cached) return JSON.parse(cached);
const user = await db.users.findById(id);
await redis.setex(`user:${id}`, 3600, JSON.stringify(user));
return user;
}
// Cache invalidation
async function updateUser(id: string, data: Partial<User>) {
await db.users.update(id, data);
await redis.del(`user:${id}`);
}
const limiter = rateLimit({
windowMs: 60 * 1000, // 1 minute
max: 100, // 100 requests per window
keyGenerator: (req) => req.ip,
handler: (req, res) => {
res.status(429).json({ error: 'Too many requests' });
}
});
/health and /ready endpoints
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Create or update AgentSkills. Use when designing, structuring, or packaging skills with scripts, references, and assets.
Set up and use 1Password CLI (op). Use when installing the CLI, enabling desktop app integration, signing in (single or multi-account), or reading/injecting/running secrets via op.
CLI to manage emails via IMAP/SMTP. Use `himalaya` to list, read, write, reply, forward, search, and organize emails from the terminal. Supports multiple accounts and message composition with MML (MIME Meta Language).