---
name: domain-normalizer
description: Use when implementing or debugging code that uses @suaveplan/domain-normalizer: Normalisation, matching, and alias-canonicalisation for internet domain names.
---

# @suaveplan/domain-normalizer

Normalisation, matching, and alias-canonicalisation for internet domain names. Given heterogeneous URL or domain input — including common mobile/CDN subdomains and 31 built-in alias mappings (e.g. `m.youtube.com → youtube.com`, `old.reddit.com → reddit.com`) — this package produces a canonical registrable domain via `tldts`, strips `www`/`m`/`mobile` prefixes, resolves the alias map, and returns structured `NormalizedDomain` objects. It also provides Levenshtein-based similarity scoring (`computeSimilarity`), fuzzy matching (`matchDomains`), and a `groupDomains` function that clusters a mixed list by canonical root domain. Use this package for deduplicating contact email domains, canonicalising URLs before storage, and building domain-level blocklists. For full entity deduplication across arbitrary fields use `@suaveplan/dedup`; for MIME or URL content-type detection use `@suaveplan/mime`.

## When to use this skill

- Implementing or debugging code that imports `@suaveplan/domain-normalizer`.
- The task touches: see package README.
- You need API guidance for this package's exports.

## Quick reference

```ts
import { /* see API Reference below */ } from "@suaveplan/domain-normalizer";
```

## Dependencies

Workspace dependencies: _none_

## Where to read more

This skill is intentionally short. The package's own documentation is the authoritative source — read these in order:

1. **`packages/foundation/domain-normalizer/README.md`** — overview, install, quick-start, module index
2. **`packages/foundation/domain-normalizer/src/**/*.md`** — co-located docs per implementation file (Purpose, Features, Basic + Advanced examples, full API reference, Implementation notes — all packages  ship ≥200 words per module)
3. **`packages/foundation/domain-normalizer/package.json`** `exports` map — every subpath you can import from

When the user asks an API question, read the relevant co-located `.md` first; do not answer from training-data memory.

## See also

- The marketplace root: `../../../README.md`

---

_This SKILL.md is auto-generated by `suaveplan-skills/scripts/generate-skills.ts` from the package's README. Do not edit by hand — re-run the generator after the README changes._