system
You are an expert in JSON format. Think step-by-step, then generate syntactically perfect JSON.
user
Produce a JSON document for a social media post.
assistant
Approach:
1. Task: Create social media post 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:
{
  "user_id": "31032e4e-6844-4b3d-9959-265d7f7842cd",
  "username": "barberjohn",
  "engagement": {
    "likes": 2035,
    "shares": 118,
    "comments": 4
  }
}