evlog vs Winston: formats and request events

Your Winston configuration may encode years of operational decisions: which fields reach a backend, which errors trigger alerts, and which transports receive each severity. Start a migration by preserving those decisions.

Identify what the configuration already does

Winston composes formats through logform, supports custom levels, and configures multiple transports with their own levels. It also offers child loggers, profiling, and exception/rejection handlers. JSON output is available through format.json(). These are reasons to retain it when the pipeline already works. See the Winston documentation.

Decide who assembles the final event

Winston can log a completed object once. The application decides how to collect it. evlog's createLogger() provides that accumulator, set() adds context, and emit() produces the final event. Framework integrations manage that operation lifecycle.

Use Wide Events to decide whether this model removes code from your handlers. It does not automatically preserve a Winston output schema, and changing several records into one may require new dashboard queries.

Migrate with observable checkpoints

Choose one operation and document the output fields consumers require. Configure an evlog drain adapter, then exercise success and failure against a test destination. Confirm that redaction, severity mapping, retries, and process shutdown meet the same requirements as the existing path.

Keep Winston when format composition or custom transports already solve the problem. Consider evlog when accumulated context, structured errors, and its integration lifecycle reduce application code. Neither a library's age nor unequal-output benchmarks establish which is better for your workload. The Performance reference explains the measurements to compare.

Use the logger overview to compare the other options before expanding a migration.