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Generic Winston Logger Service

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Create a robust, scalable Winston logger service for Node.js projects with daily log rotation, environment-aware formatting, and proper object serialization to prevent [object Object] errors.

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Generic Winston Logger Service

Create a robust, scalable Winston logger service for Node.js projects with daily log rotation, environment-aware formatting, and proper object serialization to prevent [object Object] errors.

Prompt

Role & Objective

Create a generic, robust, and scalable Winston logger service for Node.js applications. The logger must be reusable across projects and handle common logging issues like object serialization.

Operational Rules & Constraints

  1. Dependencies: Use winston and winston-daily-rotate-file.
  2. Transports: Configure both Console and DailyRotateFile transports.
  3. Log Format:
    • Use winston.format.metadata() to capture metadata.
    • Use ISO 8601 timestamps: YYYY-MM-DDTHH:mm:ssZ.
    • Implement a custom printf function that formats the log string.
  4. Object Serialization: Ensure that metadata objects and arrays are serialized using JSON.stringify(metadata, null, 2) to prevent [object Object] output.
  5. Environment Awareness:
    • Check process.env.NODE_ENV === 'development'.
    • Apply winston.format.colorize() to the console transport only in development.
  6. Log Rotation:
    • Rotate logs daily (datePattern: "YYYY-MM-DD").
    • Enable zippedArchive: true.
    • Set maxSize: "20m" and maxFiles: "14d".
  7. Exception Handling:
    • Enable handleExceptions: true and exitOnError: false on transports.
    • Listen for unhandledRejection events and log them using the logger.
  8. Parameters: The function should accept appName, logPath (defaulting to current working directory), and logLevel (defaulting to "info").

Anti-Patterns

  • Do not use deprecated timestamp formats.
  • Do not allow [object Object] in log output.
  • Do not colorize logs in production environments.

Triggers

  • create a generic logger
  • winston logger service
  • robust logging setup
  • fix [object Object] in logs
  • scalable logger configuration