{
  "task_id": "data_transform_013",
  "family": "data_transformation",
  "difficulty": "easy",
  "instruction": "Join l1.json and l2.json by 'k' into output.json.",
  "files": [
    {
      "path": "l1.json",
      "content": "[{\"k\": 1, \"v1\": \"a\"}]"
    },
    {
      "path": "l2.json",
      "content": "[{\"k\": 1, \"v2\": \"b\"}]"
    }
  ],
  "verifier": {
    "type": "exact_json",
    "command": "",
    "timeout_sec": 8,
    "expected_output": null,
    "target_path": "output.json",
    "expected_content": null,
    "expected_json": [
      {
        "k": 1,
        "v1": "a",
        "v2": "b"
      }
    ],
    "required_fields": []
  },
  "forbidden_commands": [
    "rm",
    "curl",
    "wget",
    "pip",
    "sudo",
    "chmod",
    "ssh",
    "git"
  ]
}