Observed Signal · May 6, 2026 · Technical Release · Source: DEV Community · Impact: 2/5 · Sentiment: Neutral
Subdomain Multi‑Tenancy with Next.js, Supabase, Cloudflare
A developer describes how they implemented subdomain-based multi-tenancy for Pronto (an open-source POS/CRM/booking system) using Cloudflare wildcard DNS, Next.js 14 middleware, Supabase Row-Level Security (RLS), and DigitalOcean hosting. The architecture routes all subdomains via a single Cloudflare A record and Universal SSL, extracts a tenant slug in Next.js middleware and passes it via an x-tenant-slug header, and enforces tenant isolation at the database layer with Supabase RLS policies tied to business_id. The guide covers real issues and fixes (cookie domain scope, middleware matchers, preventing double-booking with a PostgreSQL trigger), offers a cost breakdown (~$20/month for hosting), and links to the MIT-licensed open-source code on GitHub.
Practical, low-cost technical guide useful to SaaS/CRM developers and operators building multi-tenant apps and first-party data platforms; not industry-shifting but relevant to infrastructure and MarTech practitioners.
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Key Takeaways & Evidence Grounding
- Pronto is an open-source POS, CRM and booking system that assigns each customer a subdomain (e.g., salon-maya.trypronto.app).
- Architecture: Cloudflare wildcard DNS → Next.js 14 middleware (extracts tenant slug and sets x-tenant-slug header) → Supabase RLS enforcing row-level isolation by business_id.
- Cloudflare wildcard DNS + Universal SSL can be configured with a single A record (Name: *) and is available on Cloudflare's free plan.
- Supabase Row-Level Security policies are used to make tenant isolation enforced at the database level; sample SQL and migration approach provided.
- Hosting cost is reported at approximately $20/month (DigitalOcean); the Pronto codebase is MIT-licensed and available at github.com/SGrappelli/pronto.
Connected Companies & Entities
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