backend-skills

name	backend-skills
description	Master Node.js, Express, PHP, Laravel, Java, Spring Boot, API design, and database integration. Build scalable APIs and server applications.
sasmp_version	1.3.0
skill_type	atomic
version	2.0.0
parameters	{"framework":{"type":"string","enum":["express","fastify","nestjs","laravel","spring-boot","django","gin"],"default":"express"},"database":{"type":"string","enum":["postgresql","mysql","mongodb","sqlite"],"default":"postgresql"}}
validation_rules	[{"pattern":"^(GET|POST|PUT|PATCH|DELETE)$","target":"http_methods","message":"Use standard HTTP methods"},{"pattern":"^/api/v[0-9]+/","target":"api_routes","message":"API routes should be versioned"}]
retry_config	{"max_attempts":3,"backoff":"exponential","initial_delay_ms":1000,"max_delay_ms":30000}
logging	{"on_entry":"[API] {method} {path} - Request started","on_success":"[API] {method} {path} - {status} ({duration}ms)","on_error":"[API] {method} {path} - {status} {error}"}
dependencies	{"agents":["backend-server-developer"]}

Backend Development Skills

Express.js Fundamentals

const express = require('express');
const app = express();

app.use(express.json());

// Routes with error handling
app.get('/api/users/:id', async (req, res, next) => {
  try {
    const user = await User.findById(req.params.id);
    if (!user) {
      return res.status(404).json({ error: 'User not found' });
    }
    res.json(user);
  } catch (error) {
    next(error);
  }
});

// Global error handler
app.use((err, req, res, next) => {
  console.error(err.stack);
  res.status(500).json({
    error: 'Internal Server Error',
    requestId: req.id
  });
});

app.listen(3000);

RESTful API Design

HTTP Methods:
GET    /api/v1/users       - List all
GET    /api/v1/users/:id   - Get one
POST   /api/v1/users       - Create
PUT    /api/v1/users/:id   - Full update
PATCH  /api/v1/users/:id   - Partial update
DELETE /api/v1/users/:id   - Delete

Status Codes:
200 OK          - Success
201 Created     - Resource created
204 No Content  - Success, no body
400 Bad Request - Validation error
401 Unauthorized- Auth required
403 Forbidden   - No permission
404 Not Found   - Resource missing
409 Conflict    - State conflict
429 Too Many    - Rate limited
500 Server Error- Unexpected error