Cloudflare to Datadog Tail Worker

Send your Cloudflare Worker logs to Datadog in real-time. This tail worker transforms and forwards logs with custom tags and structured format.

Why This?

• Datadog SDK doesn't work in Cloudflare Workers (Node.js dependencies)
• Logpush is bulky - sends huge batches instead of individual logs
• Need real-time logs with custom enrichment and tagging

Quick Start

1. Clone and install

   git clone https://github.com/explorium-ai/cloudflare-tail-worker-datadog.git
   cd cloudflare-tail-worker-datadog
   npm install

2. Set your Datadog API key

   wrangler secret put DD_API_KEY

3. Configure environment in wrangler.jsonc:

   {
     "vars": {
       "SERVICE_NAME": "your-service-name",
       "ENVIRONMENT": "production",
       "DD_SITE": "datadoghq.com"
     }
   }

4. Deploy

   npm run deploy

5. Connect your workers - add to their wrangler.toml:

   [[tail_consumers]]
   service = "cloudflare-tail-worker-datadog"

Done! Your logs now flow to Datadog in real-time.

Configuration

Variable	Required	Description	Example
DD_API_KEY	✅	Your Datadog API key	abc123...
SERVICE_NAME	✅	Service name for tagging	my-api-service
ENVIRONMENT	❌	Environment tag (defaults to dev)	production
DD_SITE	❌	Datadog site (defaults to datadoghq.com)	datadoghq.eu

How It Works

1. Receives tail events from your Workers in real-time
2. Transforms logs into structured format with tags
3. Sends to Datadog via HTTP API
4. Adds metadata: service name, environment, timestamps

Development

npm test          # Run tests
npm run dev       # Local development  
npm run cf-typegen # Generate types

Viewing Logs in Datadog

Your logs appear in Datadog with structured tags:

Find your logs:

• Filter by source:cloudflare-tail-worker
• Use tags like service:your-service-name or env:production

Example queries:

source:cloudflare-tail-worker AND status:error
service:my-api AND env:production  
log_level:error OR log_level:warn

Troubleshooting

No logs appearing?

• Check API key exists: wrangler secret list
• Verify [[tail_consumers]] in your worker's wrangler.toml
• Ensure your workers are actually logging (console.log)
• Confirm correct DD_SITE for your region

Debug your tail worker:

wrangler tail cloudflare-tail-worker-datadog  # Watch live logs
wrangler list                  # Check deployment

License

MIT