TypeScript custom domains SDK Install Domain SDK for TypeScript

Custom domain implementation guides Build a custom-domain settings page Add and remove customer domains Display DNS records correctly Store domain state in your database Poll until a domain is active Troubleshoot pending DNS Troubleshoot certificate issuance Handle apex domains and subdomains Give tenants managed subdomains Tenant authorization and domain security Production credential setup Switch providers safely Test without external API calls

Custom domain provider comparison Vercel custom domains Cloudflare for SaaS custom domains Railway custom domains Render custom domains Netlify custom domains Testing provider

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Switch providers safely

Switch providers safely

Build a deliberate migration without pretending Domain SDK moves live traffic.

Create a separately authorized migration workflow: add the hostname to the destination, complete destination ownership/certificate pre-validation when supported, schedule DNS cutover, monitor destination state, then remove the source only after validation and rollback windows.

Domain SDK keeps the application contract stable but does not synchronize two providers, automate customer DNS, or guarantee zero downtime.

Read next: Platform providers.

Production credential setup

Scope and store platform credentials for server-side domain management.

Test without external API calls

Simulate latency, failures, transitions, and calls with isolated memory providers.