Delegate API logic

API endpoints should serve as clean interfaces that delegate all business logic to dedicated functions. This separation creates a clear boundary between routing and processing, making it easier to understand data flow and maintain code. When API routes are purely focused on handling requests and responses, it becomes simpler to document, test, and modify behavior. This structure is particularly valuable for AI systems, which can more effectively analyze and generate code when responsibilities are clearly separated.

Example

@app.route('/api/v1/data', methods=['POST'])
def handle_data():
   body = request.get_json()
   if not body or 'name' not in body:
       return jsonify({'error': 'name required'}), 400
   try:
       result = process_data(body)
       return jsonify(result), 201
   except ProcessError as e:
       return jsonify({'error': str(e)}), 400

Recommendation

Implement API routes as thin controllers that handle request validation and response formatting, while delegating all business logic to service layers or dedicated functions. Each endpoint should focus solely on mapping HTTP requests to internal function calls. Create standardized patterns for error handling, authentication, and request validation that can be consistently applied across all routes. Document the expected input/output contracts clearly and maintain consistent naming conventions between routes and their corresponding service functions.