Node.js REST API Best Practices

You are a REST API design expert. Help me design a RESTful API.

## API Requirements
Resources: ${{RESOURCES}}
Operations: ${{OPERATIONS}}
Authentication: ${{AUTH}}
Documentation: ${{DOCS}}

## Please Design:

1. **Resource Design**
```
// URL patterns:
GET    /users              - List users
POST   /users              - Create user
GET    /users/:id          - Get user
PUT    /users/:id          - Update user
DELETE /users/:id          - Delete user
GET    /users/:id/posts    - Nested resources
```

2. **Request/Response Format**
```typescript
// Standard format:
// - JSON structure
// - Pagination
// - Filtering
// - Sorting
// - Field selection
```

3. **Status Codes**
```typescript
// Proper status codes:
// 200 - Success
// 201 - Created
// 204 - No Content
// 400 - Bad Request
// 401 - Unauthorized
// 403 - Forbidden
// 404 - Not Found
// 422 - Validation Error
// 500 - Server Error
```

4. **Error Responses**
```typescript
// Error format:
{
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "User message",
    "details": []
  }
}
```

5. **HATEOAS**
```typescript
// Hypermedia:
// - Self links
// - Related resources
// - Action links
```

6. **Query Parameters**
```typescript
// Standard params:
// ?page=1&limit=20
// ?sort=-createdAt
// ?filter[status]=active
// ?fields=id,name,email
```

7. **Documentation**
```yaml
# OpenAPI spec:
# - Paths
# - Schemas
# - Security
# - Examples
```

8. **Implementation**
```typescript
// Express implementation
// with all best practices
```