Designing a SaaS platform requires addressing multi-tenancy configurations, subscription middleware checks, database isolations, and localized subdomains.

When engineers build SaaS tools, they must decide between a shared database with tenant column IDs (logical isolation) or separate databases per tenant (physical isolation). Next.js provides the ideal routing architecture to intercept tenant requests, verify Stripe subscription tokens in middleware, and render sub-second dashboards dynamically.

1. Intercepting Tenant Routes in Middleware

Next.js middleware runs before any page compiles or loads. This allows us to inspect requests, extract domain subdomains (e.g. `client.webnex.co.in`), and rewrite routes to internal dynamic folders.

Example: Next.js Multi-Tenant MiddlewareMiddleware

// src/middleware.js
import { NextResponse } from 'next/server';

export function middleware(req) {
  const url = req.nextUrl;
  const hostname = req.headers.get('host');
  
  // Extract subdomain
  const currentSubdomain = hostname.replace('.webnex.co.in', '');
  
  if (currentSubdomain && currentSubdomain !== 'www') {
    // Rewrite internal route to tenant folder
    return NextResponse.rewrite(
      new URL(`/tenants/${currentSubdomain}${url.pathname}`, req.url)
    );
  }
  return NextResponse.next();
}

Summary

Next.js dynamic routing middleware simplifies the deployment of multi-tenant SaaS. Integrating this layout with robust database isolations guarantees scale-ready performance.

Want to scale your SaaS business platform? Consult WebNex's software engineering team to design your multi-tenant stack.

Building a Multi-Tenant SaaS Platform with Next.js App Router

1. Intercepting Tenant Routes in Middleware

Summary