astute_logger 2.4.0

A simple and powerful logger for Flutter apps with support for color-coding, JSON pretty-printing, and performance tracking.

Astute Logger

A lightweight, production-ready logging package for Flutter applications that provides structured logging, persistent log storage, automatic sensitive data redaction, JSON formatting, execution time measurement, request context support, and colorful console output.

Designed to replace print() with a more powerful, secure, and maintainable logging solution.

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✨ Features

• 🚀 Structured logging with multiple log levels
• 🕒 Automatic timestamps for every log
• 📁 Persistent log file storage
• 🔐 Automatic sensitive data redaction
• 🎨 ANSI colored console output
• 📦 Pretty JSON formatting
• 📋 Pretty list printing
• ⏱ Execution time measurement
• 🌐 Request/Zone context support
• ⚡ Release mode optimization
• 🌍 Unicode & Emoji support
• 🏗 Clean and developer-friendly API

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📦 Installation

Add the package to your pubspec.yaml:

dependencies:
  astute_logger: ^latest_version

Then run:

flutter pub get

Import the package:

import 'package:astute_logger/astute_logger.dart';

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🚀 Quick Start

Create a logger instance.

final logger = Logger("AuthService");

Write logs.

logger.write(
  message: "User logged in successfully",
  level: LogLevel.info,
);

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📊 Log Levels

Debug

logger.write(
  message: "Fetching user profile",
  level: LogLevel.debug,
);

Info

logger.write(
  message: "User authenticated",
  level: LogLevel.info,
);

Warning

logger.write(
  message: "API response is taking longer than expected",
  level: LogLevel.warning,
);

Error

logger.write(
  message: "Database connection failed",
  level: LogLevel.error,
);

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🕒 Automatic Timestamp

Every log automatically includes a timestamp.

Example:

[01-07-2026 15:42:18]

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🏷 Class-Based Logging

Create separate loggers for different classes.

final authLogger = Logger("AuthService");
final apiLogger = Logger("ApiService");

Output:

AuthService::login
ApiService::fetchUsers

This makes it easy to identify where logs originate.

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📁 Persistent Log Files

Logs are automatically saved to persistent storage.

Retrieve the log file:

final file = await Logger.getLogFile();

Useful for:

• Production debugging
• User bug reports
• Offline log collection

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🔐 Automatic Sensitive Data Redaction

Astute Logger automatically masks sensitive information before writing logs.

Protected data includes:

• Bearer Tokens
• JWT Tokens
• Email Addresses
• Credit Card Numbers

Example:

Before

Authorization: Bearer eyJhbGciOi...

After

Authorization: Bearer [REDACTED]

No additional configuration is required.

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📦 Pretty JSON Logging

Instead of printing raw JSON:

logger.logJson(response);

Produces beautifully formatted output for easier debugging.

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📋 Pretty Print Lists

Print collections in a readable format.

logger.logPrettyList(
  users,
  label: "Users",
);

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📦 JSON List Logging

Pretty print JSON arrays.

logger.logJsonList(users);

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⏱ Measure Execution Time

Measure the execution duration of any operation.

final result = logger.logExecutionTime(
  "Database Query",
  () {
    return fetchUsers();
  },
);

Example output:

Database Query completed in 128 ms

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🌐 Request Context Logging

Automatically attach request metadata to logs.

await LoggerContext.runWithContext(
  requestId: "REQ-001",
  extra: {
    "userId": "123",
    "platform": "Android",
  },
  body: () {
    logger.write(
      message: "User authenticated",
      level: LogLevel.info,
    );
  },
);

Perfect for:

• API requests
• Authentication
• Distributed tracing
• Debugging asynchronous operations

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🎨 Colored Console Output

Print custom colored logs.

logger.logWithColor(
  "Everything looks good!",
  color: LogColor.green.code,
);

Supported colors include:

• Green
• Blue
• Yellow
• Red

🌍 Unicode Support

Astute Logger fully supports Unicode characters and emojis.

logger.write(
  message: "Hello 👋 你好 مرحبا नमस्ते",
  level: LogLevel.info,
);

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📖 API Overview

Method	Description
write()	Write a log message
logJson()	Pretty print JSON
logJsonList()	Pretty print JSON arrays
logPrettyList()	Pretty print Dart lists
logExecutionTime()	Measure execution time
logWithColor()	Print colored logs
Logger.getLogFile()	Retrieve the persistent log file

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✅ Why Astute Logger?

Unlike simple print() statements, Astute Logger provides:

Feature	print()	Astute Logger
Log Levels	❌	✅
File Logging	❌	✅
Colored Output	❌	✅
Timestamps	❌	✅
JSON Formatting	❌	✅
Pretty Lists	❌	✅
Request Context	❌	✅
Sensitive Data Redaction	❌	✅
Execution Time	❌	✅
Release Optimization	❌	✅

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💼 Ideal For

• Flutter Applications
• Enterprise Apps
• Banking Apps
• Healthcare Applications
• E-commerce Platforms
• REST API Clients
• Production Monitoring
• Debugging Complex Applications

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🤝 Contributing

Contributions, feature requests, and bug reports are welcome!

If you find a bug or have a suggestion, please open an issue or submit a pull request.

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📄 License

This project is licensed under the MIT License.