Advanced
These pages cover topics that go beyond the standard API surface — either because they're rarely needed, require understanding of framework internals, or solve problems specific to production deployments and unusual architectures.
Pages in this section​
| Page | What it covers |
|---|---|
| Async Local Storage | AlsExtension, AsyncLocalData, automatic log correlation for HTTP servers |
| Boot Metrics | showExtraBootStats, reading timing output, CI performance gates |
| Project Tuning | LoggerOptions, configSources, customLogger, handleGlobalErrors |
| Service Runner | One-off scripts and automation without a full application module |
| Platform Entrypoints | Shared bootstrap for multiple entrypoints, env-specific files, bootstrap wrappers |
Who these pages are for​
Most applications never need any of this. If you're still setting up your app, start with Get Started or work through the Tutorials first.
Come back to these pages when you're:
- Investigating slow startup times
- Deploying to production and tuning log output for an aggregator
- Writing a CLI tool or migration script
- Building an HTTP server that needs per-request log correlation
- Setting up multiple entrypoints (serverless functions, worker + API) that share one bootstrap
- Building a bootstrap wrapper for a multi-service platform