M
Mastra•6d ago
Omar

Disable Colors for PinoLogger

I am using pinoLogger and I wonder how can I disable the colors and modify the formatting (such as adding filename:linenumber)
4 Replies
LekoArts
LekoArts•6d ago
Hi! Here's how we internally define the pino logger: https://github.com/mastra-ai/mastra/blob/main/packages/loggers/src/pino.ts You can customize the formatting with the formatters option: https://mastra.ai/reference/observability/logging/pino-logger 
import { Mastra } from '@mastra/core/mastra';
import { PinoLogger } from '@mastra/loggers';

export const mastra = new Mastra({
  logger: new PinoLogger({ 
    name: 'Chef',
    level: 'debug',
    formatters: {
      bindings: (bindings) => {
        console.log('Custom Bindings Formatter:', bindings)
        return bindings
      },
      log: (log) => {
        console.log('Custom Log Formatter:', log)
        return log
      },
      level: (level) => {
        console.log('Custom Level Formatter:', level)
        return { level }
      }
    }
  }),
});
import { Mastra } from '@mastra/core/mastra';
import { PinoLogger } from '@mastra/loggers';

export const mastra = new Mastra({
  logger: new PinoLogger({ 
    name: 'Chef',
    level: 'debug',
    formatters: {
      bindings: (bindings) => {
        console.log('Custom Bindings Formatter:', bindings)
        return bindings
      },
      log: (log) => {
        console.log('Custom Log Formatter:', log)
        return log
      },
      level: (level) => {
        console.log('Custom Level Formatter:', level)
        return { level }
      }
    }
  }),
});
For example returns this 
Custom Log Formatter: {
  strategy: 'batch-with-updates',
  batchSize: 8,
  flushReason: 'time',
  durationMs: 17,
  outOfOrderCount: undefined
}
DEBUG [2025-12-02 09:07:15.210 +0100] (Chef): Batch flushed
    strategy: "batch-with-updates"
    batchSize: 8
    flushReason: "time"
    durationMs: 17
Custom Log Formatter: {
  strategy: 'batch-with-updates',
  batchSize: 8,
  flushReason: 'time',
  durationMs: 17,
  outOfOrderCount: undefined
}
DEBUG [2025-12-02 09:07:15.210 +0100] (Chef): Batch flushed
    strategy: "batch-with-updates"
    batchSize: 8
    flushReason: "time"
    durationMs: 17
GitHub
mastra/packages/loggers/src/pino.ts at main · mastra-ai/mastra
The TypeScript AI agent framework. ⚡ Assistants, RAG, observability. Supports any LLM: GPT-4, Claude, Gemini, Llama. - mastra-ai/mastra
Reference: PinoLogger | Observability | Mastra Docs
Documentation for PinoLogger, which provides methods to record events at various severity levels.
LekoArts
LekoArts•6d ago
If you want to disable the color output, you need to set overrideDefaultTransports (see https://github.com/mastra-ai/mastra/blob/main/packages/loggers/src/pino.ts#L25) and define a default transport (see https://github.com/mastra-ai/mastra/blob/main/packages/loggers/src/pino.ts#L43-L44)
GitHub
mastra/packages/loggers/src/pino.ts at main · mastra-ai/mastra
The TypeScript AI agent framework. ⚡ Assistants, RAG, observability. Supports any LLM: GPT-4, Claude, Gemini, Llama. - mastra-ai/mastra
LekoArts
LekoArts•6d ago
Lastly, you could also try the NO_COLOR variable: https://no-color.org/
Mastra Triager
Mastra Triager•6d ago
📝 Created GitHub issue: https://github.com/mastra-ai/mastra/issues/10747 🔍 If you're experiencing an error, please provide a minimal reproducible example whenever possible to help us resolve it quickly. 🙏 Thank you for helping us improve Mastra!

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