fix: lowercase error codes in redirects to match content collection paths

Author: danielroe

server/middleware/error-docs-redirect.ts

@@ -3,15 +3,17 @@
  *
  * The Nuxt runtime links to https://nuxt.com/docs/errors/E1001 (unversioned).
  * This middleware redirects those paths to the current default docs version
- * (e.g., /docs/4.x/errors/E1001) so the content can be resolved.
+ * (e.g., /docs/4.x/errors/e1001) so the content can be resolved.
+ *
+ * The error code is lowercased to match the content collection path.
  */
 export default defineEventHandler((event) => {
   const path = getRequestURL(event).pathname
 
   // Match /docs/errors/... but NOT /docs/3.x/errors/... or /docs/4.x/errors/...
   const match = path.match(/^\/docs\/errors\/(.+)$/)
-  if (match) {
+  if (match?.[1]) {
     // TODO: update to /docs/5.x when Nuxt 5 is the default
-    return sendRedirect(event, `/docs/4.x/errors/${match[1]}`, 302)
+    return sendRedirect(event, `/docs/4.x/errors/${match[1].toLowerCase()}`, 302)
   }
 })

server/routes/e/[code].get.ts

@@ -1,23 +1,23 @@
 /**
  * Short URL handler for Nuxt error codes.
  *
- * Redirects /e/NUXT_E1001 → /docs/4.x/errors/E1001
- * Redirects /e/NUXT_B1001 → /docs/4.x/errors/B1001
+ * Redirects /e/NUXT_E1001 → /docs/4.x/errors/e1001
+ * Redirects /e/NUXT_B1001 → /docs/4.x/errors/b1001
  *
  * The error code format is NUXT_ followed by E or B and 1-4 digits.
- * The NUXT_ prefix is stripped and the user is redirected to the
- * current default docs version.
+ * The NUXT_ prefix is stripped, the code is lowercased, and the user
+ * is redirected to the current default docs version.
  */
 export default defineEventHandler((event) => {
   const code = getRouterParam(event, 'code')
 
   // Validate: must be NUXT_ followed by E or B and 1-4 digits
-  if (!code || !/^NUXT_[EB]\d{1,4}$/.test(code)) {
+  if (!code || !/^NUXT_[EB]\d{1,4}$/i.test(code)) {
     throw createError({ statusCode: 404, statusMessage: 'Not found' })
   }
 
-  // Strip the NUXT_ prefix → E1001 or B1001
-  const errorCode = code.replace('NUXT_', '')
+  // Strip the NUXT_ prefix and lowercase → e1001 or b1001
+  const errorCode = code.replace('NUXT_', '').toLowerCase()
 
   // TODO: update to /docs/5.x when Nuxt 5 is the default
   return sendRedirect(event, `/docs/4.x/errors/${errorCode}`, 302)