{"slug":"mturac-backend-patterns","name":"backend-patterns","description":"Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.","long_description":"---\nname: backend-patterns\ndescription: Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.\n---\n\n# Backend Development Patterns\n\nBackend architecture patterns and best practices for scalable server-side applications.\n\n## When to Activate\n\n- Designing REST or GraphQL API endpoints\n- Implementing repository, service, or controller layers\n- Optimizing database queries (N+1, indexing, connection pooling)\n- Adding caching (Redis, in-memory, HTTP cache headers)\n- Setting up background jobs or async processing\n- Structuring error handling and validation for APIs\n- Building middleware (auth, logging, rate limiting)\n\n## API Design Patterns\n\n### RESTful API Structure\n\n```typescript\n// PASS: Resource-based URLs\nGET /api/markets # List resources\nGET /api/markets/:id # Get single resource\nPOST /api/markets # Create resource\nPUT /api/markets/:id # Replace resource\nPATCH /api/markets/:id # Update resource\nDELETE /api/markets/:id # Delete resource\n\n// PASS: Query parameters for filtering, sorting, pagination\nGET /api/markets?status=active&sort=volume&limit=20&offset=0\n```\n\n### Repository Pattern\n\n```typescript\n// Abstract data access logic\ninterface MarketRepository {\n findAll(filters?: MarketFilters): Promise\n findById(id: string): Promise\n create(data: CreateMarketDto): Promise\n update(id: string, data: UpdateMarketDto): Promise\n delete(id: string): Promise\n}\n\nclass SupabaseMarketRepository implements MarketRepository {\n async findAll(filters?: MarketFilters): Promise {\n let query = supabase.from('markets').select('*')\n\n if (filters?.status) {\n query = query.eq('status', filters.status)\n }\n\n if (filters?.limit) {\n query = query.limit(filters.limit)\n }\n\n const { data, error } = await query\n\n if (error) throw new Error(error.message)\n return data\n }\n\n // Other methods...\n}\n```\n\n### Service Layer Pattern\n\n```typescript\n// Business logic separated from data access\nclass MarketService {\n constructor(private marketRepo: MarketRepository) {}\n\n async searchMarkets(query: string, limit: number = 10): Promise {\n // Business logic\n const embedding = await generateEmbedding(query)\n const results = await this.vectorSearch(embedding, limit)\n\n // Fetch full data\n const markets = await this.marketRepo.findByIds(results.map(r => r.id))\n\n // Sort by similarity\n return markets.sort((a, b) => {\n const scoreA = results.find(r => r.id === a.id)?.score || 0\n const scoreB = results.find(r => r.id === b.id)?.score || 0\n return scoreA - scoreB\n })\n }\n\n private async vectorSearch(embedding: number[], limit: number) {\n // Vector search implementation\n }\n}\n```\n\n### Middleware Pattern\n\n```typescript\n// Request/response processing pipeline\nexport function withAuth(handler: NextApiHandler): NextApiHandler {\n return async (req, res) => {\n const token = req.headers.authorization?.replace('Bearer ', '')\n\n if (!token) {\n return res.status(401).json({ error: 'Unauthorized' })\n }\n\n try {\n const user = await verifyToken(token)\n req.user = user\n return handler(req, res)\n } catch (error) {\n return res.status(401).json({ error: 'Invalid token' })\n }\n }\n}\n\n// Usage\nexport default withAuth(async (req, res) => {\n // Handler has access to req.user\n})\n```\n\n## Database Patterns\n\n### Query Optimization\n\n```typescript\n// PASS: GOOD: Select only needed columns\nconst { data } = await supabase\n .from('markets')\n .select('id, name, status, volume')\n .eq('status', 'active')\n .order('volume', { ascending: false })\n .limit(10)\n\n// FAIL: BAD: Select everything\nconst { data } = await supabase\n .from('markets')\n .select('*')\n```\n\n### N+1 Query Prevention\n\n```typescript\n// FAIL: BAD: N+1 query problem\nconst markets = await getMarkets()\nfor (const market of markets) {\n market.creator = await getUser(market.creator_id) // N queries\n}\n\n// PASS: GOOD: Batch fetch\nconst markets = await getMarkets()\nconst creatorIds = markets.map(m => m.creator_id)\nconst creators = await getUsers(creatorIds) // 1 query\nconst creatorMap = new Map(creators.map(c => [c.id, c]))\n\nmarkets.forEach(market => {\n market.creator = creatorMap.get(market.creator_id)\n})\n```\n\n### Transaction Pattern\n\n```typescript\nasync function createMarketWithPosition(\n marketData: CreateMarketDto,\n positionData: CreatePositionDto\n) {\n // Use Supabase transaction\n const { data, error } = await supabase.rpc('create_market_with_position', {\n market_data: marketData,\n position_data: positionData\n })\n\n if (error) throw new Error('Transaction failed')\n return data\n}\n\n// SQL function in Supabase\nCREATE OR REPLACE FUNCTION create_market_with_position(\n market_data jsonb,\n position_data jsonb\n)\nRETURNS jsonb\nLANGUAGE plpgsql\nAS $$\nBEGIN\n -- Start transaction automatically\n INSERT INTO markets VALUES (market_data);\n INSERT INTO positions VALUES (position_data);\n RETURN jsonb_build_object('success', true);\nEXCEPTION\n WHEN OTHERS THEN\n -- Rollback happens automatically\n RETURN jsonb_build_object('success', false, 'error', SQLERRM);\nEND;\n$$;\n```\n\n## Caching Strategies\n\n### Redis Caching Layer\n\n```typescript\nclass CachedMarketRepository implements MarketRepository {\n constructor(\n private baseRepo: MarketRepository,\n private redis: RedisClient\n ) {}\n\n async findById(id: string): Promise {\n // Check cache first\n const cached = await this.redis.get(`market:${id}`)\n\n if (cached) {\n return JSON.parse(cached)\n }\n\n // Cache miss - fetch from database\n const market = await this.baseRepo.findById(id)\n\n if (market) {\n // Cache for 5 minutes\n await this.redis.setex(`market:${id}`, 300, JSON.stringify(market))\n }\n\n return market\n }\n\n async invalidateCache(id: string): Promise {\n await this.redis.del(`market:${id}`)\n }\n}\n```\n\n### Cache-Aside Pattern\n\n```typescript\nasync function getMarketWithCache(id: string): Promise {\n const cacheKey = `market:${id}`\n\n // Try cache\n const cached = await redis.get(cacheKey)\n if (cached) return JSON.parse(cached)\n\n // Cache miss - fetch from DB\n const market = await db.markets.findUnique({ where: { id } })\n\n if (!market) throw new Error('Market not found')\n\n // Update cache\n await redis.setex(cacheKey, 300, JSON.stringify(market))\n\n return market\n}\n```\n\n## Error Handling Patterns\n\n### Centralized Error Handler\n\n```typescript\nclass ApiError extends Error {\n constructor(\n public statusCode: number,\n public message: string,\n public isOperational = true\n ) {\n super(message)\n Object.setPrototypeOf(this, ApiError.prototype)\n }\n}\n\nexport function errorHandler(error: unknown, req: Request): Response {\n if (error instanceof ApiError) {\n return NextResponse.json({\n success: false,\n error: error.message\n }, { status: error.statusCode })\n }\n\n if (error instanceof z.ZodError) {\n return NextResponse.json({\n success: false,\n error: 'Validation failed',\n details: error.errors\n }, { status: 400 })\n }\n\n // Log unexpected errors\n console.error('Unexpected error:', error)\n\n return NextResponse.json({\n success: false,\n error: 'Internal server error'\n }, { status: 500 })\n}\n\n// Usage\nexport async function GET(request: Request) {\n try {\n const data = await fetchData()\n return NextResponse.json({ success: true, data })\n } catch (error) {\n return errorHandler(error, request)\n }\n}\n```\n\n### Retry with Exponential Backoff\n\n```typescript\nasync function fetchWithRetry(\n fn: () => Promise,\n maxRetries = 3\n): Promise {\n let lastError: Error\n\n for (let i = 0; i < maxRetries; i++) {\n try {\n return await fn()\n } catch (error) {\n lastError = error as Error\n\n if (i < maxRetries - 1) {\n // Exponential backoff: 1s, 2s, 4s\n const delay = Math.pow(2, i) * 1000\n await new Promise(resolve => setTimeout(resolve, delay))\n }\n }\n }\n\n throw lastError!\n}\n\n// Usage\nconst data = await fetchWithRetry(() => fetchFromAPI())\n```\n\n## Authentication & Authorization\n\n### JWT Token Validation\n\n```typescript\nimport jwt from 'jsonwebtoken'\n\ninterface JWTPayload {\n userId: string\n email: string\n role: 'admin' | 'user'\n}\n\nexport function verifyToken(token: string): JWTPayload {\n try {\n const payload = jwt.verify(token, process.env.JWT_SECRET!) as JWTPayload\n return payload\n } catch (error) {\n throw new ApiError(401, 'Invalid token')\n }\n}\n\nexport async function requireAuth(request: Request) {\n const token = request.headers.get('authorization')?.replace('Bearer ', '')\n\n if (!token) {\n throw new ApiError(401, 'Missing authorization token')\n }\n\n return verifyToken(token)\n}\n\n// Usage in API route\nexport async function GET(request: Request) {\n const user = await requireAuth(request)\n\n const data = await getDataForUser(user.userId)\n\n return NextResponse.json({ success: true, data })\n}\n```\n\n### Role-Based Access Control\n\n```typescript\ntype Permission = 'read' | 'write' | 'delete' | 'admin'\n\ninterface User {\n id: string\n role: 'admin' | 'moderator' | 'user'\n}\n\nconst rolePermissions: Record = {\n admin: ['read', 'write', 'delete', 'admin'],\n moderator: ['read', 'write', 'delete'],\n user: ['read', 'write']\n}\n\nexport function hasPermission(user: User, permission: Permission): boolean {\n return rolePermissions[user.role].includes(permission)\n}\n\nexport function requirePermission(permission: Permission) {\n return (handler: (request: Request, user: User) => Promise) => {\n return async (request: Request) => {\n const user = await requireAuth(request)\n\n if (!hasPermission(user, permission)) {\n throw new ApiError(403, 'Insufficient permissions')\n }\n\n return handler(request, user)\n }\n }\n}\n\n// Usage - HOF wraps the handler\nexport const DELETE = requirePermission('delete')(\n async (request: Request, user: User) => {\n // Handler receives authenticated user with verified permission\n return new Response('Deleted', { status: 200 })\n }\n)\n```\n\n## Rate Limiting\n\n### Simple In-Memory Rate Limiter\n\n```typescript\nclass RateLimiter {\n private requests = new Map()\n\n async checkLimit(\n identifier: string,\n maxRequests: number,\n windowMs: number\n ): Promise {\n const now = Date.now()\n const requests = this.requests.get(identifier) || []\n\n // Remove old requests outside window\n const recentRequests = requests.filter(time => now - time < windowMs)\n\n if (recentRequests.length >= maxRequests) {\n return false // Rate limit exceeded\n }\n\n // Add current request\n recentRequests.push(now)\n this.requests.set(identifier, recentRequests)\n\n return true\n }\n}\n\nconst limiter = new RateLimiter()\n\nexport async function GET(request: Request) {\n const ip = request.headers.get('x-forwarded-for') || 'unknown'\n\n const allowed = await limiter.checkLimit(ip, 100, 60000) // 100 req/min\n\n if (!allowed) {\n return NextResponse.json({\n error: 'Rate limit exceeded'\n }, { status: 429 })\n }\n\n // Continue with request\n}\n```\n\n## Background Jobs & Queues\n\n### Simple Queue Pattern\n\n```typescript\nclass JobQueue {\n private queue: T[] = []\n private processing = false\n\n async add(job: T): Promise {\n this.queue.push(job)\n\n if (!this.processing) {\n this.process()\n }\n }\n\n private async process(): Promise {\n this.processing = true\n\n while (this.queue.length > 0) {\n const job = this.queue.shift()!\n\n try {\n await this.execute(job)\n } catch (error) {\n console.error('Job failed:', error)\n }\n }\n\n this.processing = false\n }\n\n private async execute(job: T): Promise {\n // Job execution logic\n }\n}","tagline":"Backend architecture patterns, API design, database optimization, and server-side best practices for Node.js, Express, and Next.js API routes.","category":"design-creative","tags":["agent-skill"],"author":"mturac","verified":false,"attribution":{"status":"registry_indexed","statusLabel":"Registry indexed","shortLabel":"REGISTRY INDEXED","sourceLabel":"github candidate review","sourceDetail":"mturac/everything-openai-codex","creatorName":"mturac","creatorUrl":"https://github.com/mturac","sourceUrl":"https://github.com/mturac/everything-openai-codex/tree/main/.agents/skills/backend-patterns","indexedBy":"OpenAgentSkill community index","claimUrl":"https://www.openagentskill.com/skills/mturac-backend-patterns#claim-this-skill","claimCta":"Claim this skill","trustNote":"This listing was indexed from public sources and is not marked official until a maintainer claim is approved.","publicNote":"Attribution links to the public repository or creator profile. 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