統合スタックのデプロイとデバッグ

Once your Deno logic runs inside Workers locally, the next step is deploying and debugging the integrated stack in production.

Always validate locally with wrangler dev, which emulates the Workers runtime so issues surface before deploy.

Ship the Worker (with your bundled Deno-compatible code) using a single command.

Watch real production requests in real time with wrangler tail — essential for debugging issues you cannot reproduce locally.

Use console.log with structured objects so logs are searchable in tail and the dashboard.

Wrap handlers in try/catch and return a clean error response so a single failure does not crash the request.

Enable source maps so production stack traces point to your original code, not the bundled output.

Deploy to a staging environment first, verify, then promote to production to limit blast radius.

Workers keep deployment versions. If a release misbehaves, roll back instantly to the last known good version.

Some Deno APIs have no Workers equivalent. When tail shows undefined errors, check that your shared code only uses Web-standard APIs available in both runtimes.

Recommended workflow:

• Test locally with wrangler dev
• Deploy to staging
• Tail logs and verify
• Promote to production
• Keep rollback ready

Test your deploy and debug knowledge.

You learned to emulate locally, deploy with Wrangler, stream logs via tail, add structured logging and source maps, use staged rollouts, and roll back safely when a release goes wrong.