Redirect Semantics Preflight
A downloadable tool
Move redirect rules between Vercel and Netlify without hiding behavior that cannot move cleanly.
Redirect Semantics Preflight is a local, offline CLI that reads a bounded Vercel vercel.json redirect list or Netlify _redirects file, produces target configuration, and labels every rule as EXACT, LOSSY_WITH_WARNING, UNSUPPORTED, or MANUAL_CODE_REQUIRED.
Included
• Vercel JSON ↔ Netlify _redirects
• Deterministic per-rule evidence and generated target text
• Explicit 307/308 method-preservation warnings
• Fail-closed handling for conditions, force rules, unsafe order, malformed rules, and excluded grammar
• Human-readable text and structured JSON reports
• Local read-only processing; no upload, account, telemetry, subscription, or runtime network use
• Windows, macOS, and Linux with Node.js 20+
Deliberately not included
Deployment, live URL checking, SEO certification, framework/middleware analysis, GUI, hosted service, Cloudflare, Apache, nginx, or custom migration consulting.
Version 0.1.0. One-time minimum price: USD 39. Read the limitations before purchase and review every generated rule before staging or deployment.
Purchase
In order to download this tool you must purchase it at or above the minimum price of $39 USD. You will get access to the following files:
