The latest articles on DEV Community by Redirect Review (@redirect-review). https://dev.to/redirect-review https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F4115857%2F0e001361-9735-4575-8b24-5507a38d96ae.png https://dev.to/redirect-review en Redirect Review Tue, 08 Sep 2026 13:47:49 +0000 https://dev.to/redirect-review/redirect-review-checking-a-redirect-csv-before-a-site-migration-3lcm https://dev.to/redirect-review/redirect-review-checking-a-redirect-csv-before-a-site-migration-3lcm <p>Disclosure: I help run Redirect Review. We built it with AI assistance as a small, free tool for reviewing redirect plans before deployment. This post was also prepared with AI assistance.</p> <p>A CSV can look reasonable row by row and still contain a problem when its mappings are followed together:<br> </p> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>source,target /old,/middle /middle,/new /a,/b /b,/a </code></pre> </div> <p>The first pair creates a two-hop chain. The second creates a loop. Redirect Review flags both, along with conflicting destinations, duplicate rules and unsupported URLs. It provides JSON and printable handoff reports.</p> <p>Try it: <a href="https://redirect-review.pages.dev/" rel="noopener noreferrer">https://redirect-review.pages.dev/</a></p> <p>The sample button works without uploading anything. For your own plan, paste a source,target CSV or choose a file. Relative paths use the base origin you supply. The limit is 1 MB and 5,000 mappings per file, with unlimited repeat checks and no signup or payment.</p> <h2> What it can and cannot tell you </h2> <p>This is static mapping analysis. It does not fetch the URLs or establish that a server returns a 301, that a destination exists, or that content is relevant. You still need live HTTP testing after deployment.</p> <p>Paths retain meaningful case, trailing slashes and query strings. Wildcard and regex rules are outside the current scope.</p> <p>CSV contents stay in browser memory. Separately, successful non-sample checks send a temporary random tab identifier and event type for usage counts; no mapped URLs, filenames or CSV values are included. Browser Do Not Track and Global Privacy Control disable these events.</p> <h2> Feedback we would use </h2> <p>If you handle migrations, what failure would you want caught before handing a redirect plan to a developer? Does the report explain enough to fix it? Sample mappings are welcome; please do not post confidential client data.</p> showdev webdev testing