Clerk Logging Configuration Guide

This guide covers how to configure CLERK_LOGGING in your Clerk application, both through environment variables and programmatically.

Overview

Clerk logging helps you debug and monitor authentication flows in your application. You can enable different levels of logging to see what's happening under the hood.

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Method 1: Using Environment Variables

Setting in .env File

Create or edit your .env.local file (or .env file) in your project root:

CLERK_LOGGING=true

Log Levels

You can specify different log levels:

# Enable all logging
CLERK_LOGGING=true

# Or specify a log level
CLERK_LOGGING=debug
CLERK_LOGGING=info
CLERK_LOGGING=warn
CLERK_LOGGING=error

Platform-Specific Setup

Next.js

Add to .env.local:

CLERK_LOGGING=true

The environment variable will be automatically picked up by Clerk.

Node.js/Express

Add to .env:

CLERK_LOGGING=true

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Method 2: Programmatic Configuration

Next.js (App Router)

export default function MyApp({ Component, pageProps }: AppProps) {
  return (
    <ClerkProvider
        {...pageProps}
        debug={true}
        telemetry={true}
    >
  );
}

Log Levels Explained

Level	Description
debug	Most verbose - shows all logs including internal operations
info	General informational messages about normal operations
warn	Warning messages for potentially problematic situations
error	Only error messages

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Best Practices

1. Development: Enable debug logging to see detailed information

   CLERK_LOGGING=debug

2. Production: Disable or use error-level logging only

   CLERK_LOGGING=error

3. Security: Never commit .env files with sensitive keys to version control

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Troubleshooting

Logs Not Appearing

1. Verify the environment variable is loaded:

   console.log(process.env.CLERK_LOGGING);

2. Check browser console (frontend) or terminal (backend)

3. Ensure you've restarted your development server after changing .env files

4. For Next.js, ensure you're using the correct prefix (NEXT_PUBLIC_ for client-side)

Too Many Logs

Reduce verbosity by changing the log level:

CLERK_LOGGING=warn

Or disable completely:

CLERK_LOGGING=false

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Additional Resources

• Clerk Documentation
• Environment Variables Best Practices
• Debugging Guide