03_MOCK_JSON

Mock JSON Generator

Generate API-shaped JSON payloads with realistic IDs, names, emails, timestamps, states, and nested-ready fields.

API payload fixtures
Stable seed regeneration
Works without signup
Live Generator
Seed 9001 | 4 rows | JSON
{
  "user_id": "id.uuid",
  "username": "human.username",
  "email": "contact.email",
  "status": {
    "type": "state.pick",
    "options": {
      "values": [
        "active",
        "trialing",
        "past_due"
      ]
    }
  },
  "last_seen_at": "datetime.datetime"
}
No AI. No model training.

DerpData uses deterministic rules and Markov models, not LLM calls. Same seed and schema can reproduce the same fixture for tests, demos, and CI.

API docs