PinoLogger

A Logger instance is created using new PinoLogger() and provides methods to record events at various severity levels.

When deploying to Mastra Cloud, logs are displayed on the Logs page. In self-hosted or custom environments, logs can be directed to files or external services depending on the configured transports.

Usage example

src/mastra/index.ts


import { Mastra } from '@mastra/core/mastra';
import { PinoLogger } from '@mastra/loggers';
 
export const mastra = new Mastra({
  // ...
  logger: new PinoLogger({
    name: 'Mastra',
    level: 'info',
  }),
});

Parameters

name:

string

A label used to group and identify logs from this logger.

level:

"debug" | "info" | "warn" | "error"

Sets the minimum log level. Messages below this level are ignored.

transports:

Record<string, LoggerTransport>

A map of transport instances used to persist logs.

overrideDefaultTransports?:

boolean

If true, disables the default console transport.

formatters?:

pino.LoggerOptions['formatters']

Custom Pino formatters for log serialization.

File transport (structured logs)

Writes structured logs to a file using the FileTransport. The logger accepts a plain message as the first argument and structured metadata as the second argument. These are internally converted to a BaseLogMessage and persisted to the configured file path.

src/mastra/loggers/file-transport.ts


import { FileTransport } from "@mastra/loggers/file";
import { PinoLogger } from "@mastra/loggers/pino";
 
export const fileLogger = new PinoLogger({
  name: "Mastra",
  transports: { file: new FileTransport({ path: "test-dir/test.log" }) },
  level: "warn",
});

File transport usage


fileLogger.warn("Low disk space", {
  destinationPath: "system",
  type: "WORKFLOW",
});

Upstash transport (remote log drain)

Streams structured logs to a remote Redis list using the UpstashTransport. The logger accepts a string message and a structured metadata object. This enables centralized logging for distributed environments, supporting filtering by destinationPath, type, and runId.

src/mastra/loggers/upstash-transport.ts


import { UpstashTransport } from "@mastra/loggers/upstash";
import { PinoLogger } from "@mastra/loggers/pino";
 
export const upstashLogger = new PinoLogger({
  name: "Mastra",
  transports: {
    upstash: new UpstashTransport({
      listName: "production-logs",
      upstashUrl: process.env.UPSTASH_URL!,
      upstashToken: process.env.UPSTASH_TOKEN!,
    }),
  },
  level: "info",
});

Upstash transport usage


upstashLogger.info("User signed in", {
  destinationPath: "auth",
  type: "AGENT",
  runId: "run_123",
});

Custom transport

You can create custom transports using the createCustomTransport utility to integrate with any logging service or stream.

Sentry transport example

Creates a custom transport using createCustomTransport and integrates it with a third-party logging stream such as pino-sentry-transport. This allows forwarding logs to an external system like Sentry for advanced monitoring and observability.

src/mastra/loggers/sentry-transport.ts


import { createCustomTransport } from "@mastra/core/loggers";
import { PinoLogger } from "@mastra/loggers/pino";
import pinoSentry from "pino-sentry-transport";
 
const sentryStream = await pinoSentry({
  sentry: {
    dsn: "YOUR_SENTRY_DSN",
    _experiments: {
      enableLogs: true,
    },
  },
});
 
const customTransport = createCustomTransport(sentryStream);
 
export const sentryLogger = new PinoLogger({
  name: "Mastra",
  level: "info",
  transports: { sentry: customTransport },
});