Message Format

Each log entry is serialized as JSON.

{
  "id": "uuid-or-random-id",
  "timestamp": "2026-02-13T12:34:56.789Z",
  "level": "INFO",
  "args": ["Server started", { "port": 8080 }],
  "stacktrace": "optional stack trace",
  "metadata": {
    "file": "handler.go",
    "line": 123,
    "func": "handleRequest",
    "lang": "node|python|go|rust",
    "service": "my-service"
  }
}

Transport differs by runtime mode:

• Live mode: JSON payload over WebSocket.
• Replay mode: newline-delimited JSON (.ndjson).