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Next.js App Generator & Auth API: A Bubble Alternative

Explore CRM, marketplace, and booking templates you can ship this week. Our opinionated scaffolds pair an API builder with auth and a Next.js app generator. Get ownable code with RBAC, payments, calendars, automation, and analytics.

March 12, 20263 min read472 words
Next.js App Generator & Auth API: A Bubble Alternative

Template Library Deep Dive: CRM, Marketplace, and Booking

Building production apps fast shouldn't mean vendor lock-in. Here's how our template library works as a pragmatic Bubble alternative: opinionated scaffolds, an API builder with auth baked in, and a Next.js app generator that outputs readable, ownable code. Below, we go step-by-step through CRM, marketplace, and booking templates you can ship this week.

CRM Template: relationships first

  • Model: Accounts, Contacts, Deals, Activities. Each Deal references Account and Owner; Activities polymorph across calls, emails, and tasks.
  • API: One-click CRUD via the API builder with auth; RBAC policies restrict Deal stage edits to Owners and Sales Admins.
  • UI: Next.js app generator produces pages for Kanban pipelines, contact timelines, and inline activity logging with optimistic updates.
  • Automation: Webhooks for lead capture; server actions score leads and auto-assign using round-robin rules.
  • Analytics: Materialized views for win rate, velocity, and cohort leakage; schedule refresh with cron.

Marketplace Template: liquidity by design

  • Model: Users split into Buyers/Sellers via Roles; Listings with Variants; Orders with state machine (Draft, Paid, Fulfilled, Disputed).
  • Payments: Adapter layer for Stripe and Adyen; escrow hold captured on Paid; release triggered by delivery event.
  • API and auth: Signed upload URLs, rate-limited search, verified Seller onboarding; fine-grained scopes for dispute staff.
  • UI: Next.js generator includes SEO-ready listing pages, server components for filters, and incremental static regeneration.
  • Trust: Review service with Bayesian weighting; fraud signals stored separately to avoid PII exposure.

Booking Template: time is inventory

  • Model: Resources, Availability windows, Reservations, and Buffers. Double-booking prevented via transaction-level checks.
  • Calendars: ICS import/export, Google Calendar sync with webhook fallback; conflict resolution UI for operators.
  • Pricing: Rule engine (peak, last-minute, coupon stack) evaluated atomically at checkout.
  • API builder with auth: Tenant isolation via org_id; service accounts for kiosks; short-lived tokens for client widgets.
  • UI: Next.js app generator outputs slot pickers, timezone-aware lists, and admin override flows.

Cross-cutting playbook

  • Migrations from Bubble: export CSVs, map to models, run idempotent seed scripts; keep slugs to preserve SEO.
  • Observability: Structured logs with request IDs, OpenTelemetry traces, SLOs for p95 latency per endpoint.
  • Performance: Edge caching for public pages, N+1 guards in ORM, background queues for webhooks.
  • Security: Organization RBAC, audit trails, rotating keys, and least-privilege API tokens.
  • Delivery: CI templates run tests, smoke deploy to preview, then promote with blue-green cutover.

Pick a template, adjust the schema, regenerate via the Next.js app generator, and extend endpoints in the API builder with auth. You get the speed of a no-code tool with code you own, a modern Bubble alternative engineered for scale.

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Photo by Cemrecan Yurtman on Pexels

When you outgrow templates, fork the code, add modules, and regenerate types; our Next.js app generator and API builder with auth stay aligned, making this Bubble alternative a foundation for enterprise teams.

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Photo by www.kaboompics.com on Pexels
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