📘 doc: merge

Author: SaltyAom

docs/integrations/custom-404.md

@@ -0,0 +1,30 @@
+---
+title: Custom 404 - ElysiaJS
+head:
+  - - meta
+    - property: 'og:title'
+      content: Custom 404 - ElysiaJS
+
+  - - meta
+    - name: 'description'
+      content: You can define custom 404 using `onError` hook to intercept "NOT_FOUND" event and return a custom response
+
+  - - meta
+    - property: 'og:description'
+      content: You can define custom 404 using `onError` hook to intercept "NOT_FOUND" event and return a custom response
+---
+
+# Custom 404
+You can define custom 404 using `onError` hook:
+```typescript
+import { Elysia } from 'elysia'
+
+new Elysia()
+    .onError(({ code, error }) => {
+        if (code === 'NOT_FOUND')
+            return new Response('Not Found :(', {
+                status: 404
+            })
+    })
+    .listen(8080)
+```