Try returning json via SK

src/components/molecules/EmailForm.svelte

@@ -45,16 +45,16 @@
             })
             const result: FormStatus = await req.json()
             formStatus = result
-            console.log(result)
+            console.log('SK api response:', result)
 
-            // // If successful
-            // if (formStatus.success) {
-            //     sendEvent('newsletterSubscribe')
-            // } else {
-            //     // Hide message for errors
-            //     clearTimeout(formMessageTimeout)
-            //     formMessageTimeout = requestAnimationFrame(() => setTimeout(() => formStatus = null, 4000))
-            // }
+            // If successful
+            if (formStatus.success) {
+                sendEvent('newsletterSubscribe')
+            } else {
+                // Hide message for errors
+                clearTimeout(formMessageTimeout)
+                formMessageTimeout = requestAnimationFrame(() => setTimeout(() => formStatus = null, 4000))
+            }
         }
     }
 </script>

src/routes/api/newsletter/+server.ts

@@ -1,6 +1,6 @@
 import { NEWSLETTER_API_TOKEN, NEWSLETTER_LIST_ID } from '$env/static/private'
 import type { RequestHandler } from './$types'
-import { error } from '@sveltejs/kit'
+import { error, json } from '@sveltejs/kit'
 
 export const POST = (async ({ request, fetch }) => {
     const data: { email: string } = await request.json()
@@ -15,28 +15,27 @@ export const POST = (async ({ request, fetch }) => {
         throw error(400, { message: 'INVALID_EMAIL' })
     }
 
-    return new Response(JSON.stringify({
-        email,
-    }))
+    // return json(email)
 
-    // // Newsletter API request
-    // const req = await fetch(`https://emailoctopus.com/api/1.6/lists/${NEWSLETTER_LIST_ID}/contacts`, {
-    //     method: 'POST',
-    //     headers: { 'Content-Type': 'application/json' },
-    //     body: JSON.stringify({
-    //         api_key: NEWSLETTER_API_TOKEN,
-    //         email_address: email,
-    //     })
-    // })
-    // const res = await req.json()
+    // Newsletter API request
+    const req = await fetch(`https://emailoctopus.com/api/1.6/lists/${NEWSLETTER_LIST_ID}/contacts`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+            api_key: NEWSLETTER_API_TOKEN,
+            email_address: email,
+        })
+    })
+    const res = await req.json()
+    console.log('server API response:', res)
 
-    // // Other error
-    // if (res && res.status !== 'PENDING') {
-    //     throw error(400, { message: res.error.code })
-    // }
+    // Other error
+    if (res && res.status !== 'PENDING') {
+        throw error(400, { message: res.error.code })
+    }
 
-    // return new Response(JSON.stringify({
-    //     success: true,
-    //     message: res.status,
-    // }))
+    return json({
+        success: true,
+        message: res.status,
+    })
 }) satisfies RequestHandler