Next.js SaaS starter with Amazon S3
User uploads in Next.js need auth checks, pre-signed URLs, and sane defaults. Amazon S3 is wired with authorized upload routes so you are not building file plumbing in week one.
The problem
File uploads with Amazon S3 in Next.js need auth checks, pre-signed URLs, and MIME validation, work that rarely belongs in week one of a new SaaS.
Building it yourself
Scaffold Next.js, find a Amazon S3 tutorial, wire env vars, fix auth sessions, then repeat for billing and email. Most teams lose weeks before the stack deploys cleanly or handles real users.
What you get out of the box
- S3-compatible upload helpers
- GET/POST API routes for assets
- Works with AWS or S3-compatible stores
How teams ship with this kit
- 1
Clone and configure
Add your Amazon S3 keys and provider settings to the included env template. The Next.js app boots with the integration active.
- 2
Customize product flows
Adjust pages, pricing, and onboarding on top of pre-wired routes. Auth, webhooks, and integration helpers stay intact.
- 3
Deploy with included configs
Use the bundled Vercel, Cloudflare Workers, or Node deployment setup. Sessions and webhooks are tuned for production, not just localhost.
- 4
Swap providers later
Client wants a different payment processor or database? Change adapters through config instead of rewriting your Next.js app.
Also ships with every Next.js kit
- Authorized uploads
- Pre-signed URLs
- User auth gates
- S3/R2 provider swap
Common questions
Is this only about Amazon S3?
No. The Next.js kit is a complete SaaS foundation. Amazon S3 ships alongside auth, billing, email, analytics, storage, and deployment so you are not assembling the stack from scattered tutorials.
Can I see it working before I buy?
Yes. The live demo runs the same Next.js starter with real auth and billing flows. Open the demo, click through signup and checkout, then compare with your timeline.
What if I need Astro or SvelteKit instead?
LaunchFast ships the same integration surface in all three frameworks. Related links on this page point to the Amazon S3 guides for Astro and SvelteKit too.