Observed Signal · Apr 5, 2026 · Migration · Source: DEV Community · Impact: 2/5 · Sentiment: Positive
Migrated SaaS from Vercel to Cloudflare Workers
A developer migrated VideoCaptions.AI from Vercel to Cloudflare Workers after hitting Vercel CPU limits during a traffic spike. The migration was done in three reversible phases: moving API routes to a Worker, migrating the full SSR site, and a DNS cutover. Key issues encountered included incompatible Node.js libraries (the AWS SDK) requiring aws4fetch, Workers runtime restrictions (no async I/O or setTimeout at module init), oversized server bundles due to client-only WASM leakage, prerendering/manifest issues with the Cloudflare Vite plugin, and auth key/environment gotchas. The author implemented feature toggles, preview/prod environments via wrangler, and a rollback plan. Post-migration benefits reported: lower monthly costs (~$5.50/month), free WAF/DDoS protection, Turnstile, Web Analytics, Workers Traces, and zero egress fees for R2.
Practical, technical migration case study with concrete runtime incompatibilities, migration strategy, rollback and CI/CD patterns. Useful for engineering teams considering Cloudflare Workers but not industry-shifting.
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Key Takeaways & Evidence Grounding
- VideoCaptions.AI migrated hosting from Vercel to Cloudflare Workers.
- Migration executed in three reversible phases: API routes to Worker, full site SSR to Worker, DNS cutover to Cloudflare.
- AWS SDK ( @aws-sdk/client-s3 ) is incompatible with the Workers runtime; author replaced it with aws4fetch.
- Cloudflare provided free features post-migration: WAF, automatic DDoS protection, Turnstile, Web Analytics, Workers Traces, and zero egress fees for R2.
- Estimated monthly cost after migration reported as approximately $5.50/month (Workers paid $5 + R2 ~$0.50).
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Related Market Signals & Shifts
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