Pino Logging

Apply these conventions when working with pino logging code.

Compatibility

Current stable checked: Pino 10.3.1.
Pino 10 dropped Node.js 18 support. For Node.js 18 applications, stay on the Pino 9 line unless the runtime can be upgraded.
Official runtimes are Node.js, Bare, and Pear; browser usage has a separate API surface. Bundlers must emit Pino worker/transport support files separately.

Create with pino(options, destination). Both arguments are optional.
Key options: level (default 'info'), name, base (default {pid, hostname} — set to undefined to omit), timestamp (default true), messageKey (default 'msg'), errorKey (default 'err').
Use enabled: false to disable logging entirely (e.g., in tests).
Use nestedKey to namespace logged objects and avoid key collisions with the log envelope.
depthLimit (default 5) and edgeLimit (default 100) only affect Pino's fallback serializer after JSON.stringify throws; do not rely on them as general output-size or traversal limits.