An open-source TypeScript library for custom domains in SaaS: it sets up a customer's DNS records through their own Cloudflare or Vercel account. Docs, guides, and components are at domain-kit.dev, and you can ask questions about the code on DeepWiki.
DomainKit turns your product's DNS requirements into a plan a customer can review, applies only the plan digest they approved, keeps a receipt of every write, and plans cleanup from that receipt. Cloudflare and Vercel are built in, and a provider is one declarative value.
Plans are additive and fail closed: missing records are created, exact records are no-ops, and
incompatible state is a conflict rather than an overwrite. DnsRecord.spf declares an SPF record
that coexists with unrelated TXT and conflicts with a different or duplicate SPF record.
Your app keeps identity, tenancy, credentials, storage, routes, consent, and audit. DomainKit supplies the lifecycle, not a hosted control plane.
Samva sets up customer domains with DomainKit. Read how Samva sets up customer domains.
domainkit— the Effect-native lifecycle, its host seams, the providers, and the values.domainkit/servermounts the routes,domainkit/clientcalls them from the browser, anddomainkit/testingships the fakes and conformance runners.@domainkit/react— React 19 flows over a transport your server owns.@domainkit/capsuledb—Storageon PostgreSQL as one declarative CapsuleDB capsule.
apps/docs— the documentation site and the interactive component catalog, published at domain-kit.dev.examples— the snippets the site renders, typechecked against the built packages.packages/domainkit/examples— runnable Effect examples the core package's own checks gate.
Use the Bun version pinned in package.json (1.4.4) and Node.js 24.10 or newer:
bun install --frozen-lockfile
bun run check
bun run build
bun run test:artifact
bun run docs:checkbun run release:check runs all validation serially. release:version prepares Tegami metadata;
release:publish runs the gated version-PR and publication path used on main.
CONTRIBUTING.md covers setup, command contracts, and release behavior.
If your product uses DomainKit, you can show it in your README:
[](https://domain-kit.dev)