Emit structured logs with Pino throughout the app.
Prerequisites
Complete these setup recipes first:
- Pino Logging Setup
Logging
Import logger from @/lib/logging/logger. Pass a context object first, message second. For errors, put err in the context object.
import { logger } from "@/lib/logging/logger";
logger.info({ port: 3000 }, "Server started"); logger.warn({ endpoint: "/api/chat" }, "Rate limit reached"); logger.debug({ key: "user:123" }, "Cache miss"); logger.error({ err, userId: "123", endpoint: "/api/chat" }, "Request failed");
### Levels
| Level | When to Use |
| ------- | ---------------------------------------- |
| `trace` | Detailed debugging (rarely used) |
| `debug` | Development troubleshooting |
| `info` | Normal operations, business events |
| `warn` | Recoverable issues, deprecation warnings |
| `error` | Failures that need attention |
| `fatal` | Critical failures, app cannot continue |
Set the active threshold via `LOG_LEVEL` (defaults to `info`). Use `warn` in production.
```env
LOG_LEVEL="debug"
In API Routes
Log on the way out with timing context.
import { logger } from "@/lib/logging/logger";
export async function POST(request: Request) {
const start = Date.now();
try {
const result = await processRequest(request);
logger.info(
{ duration: Date.now() - start, status: 200 },
"Request completed",
);
return Response.json(result);
} catch (err) {
logger.error({ err, duration: Date.now() - start }, "Request failed");
return Response.json({ error: "Internal error" }, { status: 500 });
}
}
In Workflows
The workflow runtime can't import Node modules, so the logger can't be called directly. Wrap it in a "use step" function.
// src/workflows/chat/steps/logger.ts
import { logger } from "@/lib/logging/logger";
export async function log(
level: "info" | "warn" | "error" | "debug",
message: string,
data?: Record<string, unknown>,
): Promise<void> {
"use step";
if (data) {
logger[level](data, message);
} else {
logger[level](message);
}
}
import { log } from "./steps/logger";
export async function chatWorkflow({ chatId }) {
"use workflow";
await log("info", "Workflow started", { chatId });
}