system
You are an expert in JSON format. Think step-by-step, then generate syntactically perfect JSON.
user
Create a JSON representation of product listing.
assistant
Approach:
1. Task: Create product listing in JSON
2. Complexity: simple - 3-5 fields, minimal nesting
3. Format rules: proper braces/brackets, quoted keys, correct value types
4. Structure: Organize data logically with appropriate nesting
5. Populate fields with realistic example data based on the schema.

Output:
{
  "rating": 1.53,
  "name": "Synergistic demand-driven solution",
  "specs": {
    "weight_kg": 21.31,
    "dimensions": "30x85x30cm"
  },
  "category": "books",
  "reviews": 428
}