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ConsoleExporter

Outputs trace events to the console for debugging and development.

Constructor​

new ConsoleExporter(config?: BaseExporterConfig)

BaseExporterConfig​

interface BaseExporterConfig {
  logger?: IMastraLogger;
  logLevel?: LogLevel | 'debug' | 'info' | 'warn' | 'error';
}

Properties​

readonly name = 'tracing-console-exporter';

Methods​

exportTracingEvent​

async exportTracingEvent(event: TracingEvent): Promise<void>

Exports a tracing event to the console.

shutdown​

async shutdown(): Promise<void>

Logs shutdown message.

Output Format​

The exporter outputs different formats based on event type:

SPAN_STARTED​

🚀 SPAN_STARTED
   Type: [span type]
   Name: [span name]
   ID: [span id]
   Trace ID: [trace id]
   Input: [formatted input]
   Attributes: [formatted attributes]
────────────────────────────────────────

SPAN_ENDED​

✅ SPAN_ENDED
   Type: [span type]
   Name: [span name]
   ID: [span id]
   Duration: [duration]ms
   Trace ID: [trace id]
   Input: [formatted input]
   Output: [formatted output]
   Error: [formatted error if present]
   Attributes: [formatted attributes]
────────────────────────────────────────

SPAN_UPDATED​

📝 SPAN_UPDATED
   Type: [span type]
   Name: [span name]
   ID: [span id]
   Trace ID: [trace id]
   Input: [formatted input]
   Output: [formatted output]
   Error: [formatted error if present]
   Updated Attributes: [formatted attributes]
────────────────────────────────────────

Usage​

import { ConsoleExporter } from "@mastra/observability";
import { ConsoleLogger, LogLevel } from "@mastra/core/logger";

// Use default logger (INFO level)
const exporter = new ConsoleExporter();

// Use custom log level
const exporter = new ConsoleExporter({
  logLevel: 'debug'
});

// Use custom logger instance
const customLogger = new ConsoleLogger({ level: LogLevel.DEBUG });
const exporterWithLogger = new ConsoleExporter({
  logger: customLogger
});

Implementation Details​

  • Formats attributes as JSON with 2-space indentation
  • Calculates and displays span duration in milliseconds
  • Handles serialization errors gracefully
  • Logs unimplemented event types as warnings
  • Uses 80-character separator lines between events

See Also​

Documentation​

Other Exporters​

Reference​