diff --git a/src/api/transit/transitDecrypt.ts b/src/api/transit/transitDecrypt.ts
index 1a7ff5e..0ea48f8 100644
--- a/src/api/transit/transitDecrypt.ts
+++ b/src/api/transit/transitDecrypt.ts
@@ -5,10 +5,14 @@ type DecryptionResult = {
   plaintext: string;
 }
 
+type DecryptionPayload = {
+  ciphertext: string;
+}
+
 export async function transitDecrypt(
   baseMount: string,
   name: string,
-  data: string
+  payload: DecryptionPayload
 ): Promise<DecryptionResult> {
   const request = new Request(appendAPIURL(removeDoubleSlash(`/v1/${baseMount}/decrypt/${name}`)), {
     method: 'POST',
@@ -16,7 +20,7 @@ export async function transitDecrypt(
       'Content-Type': 'application/json',
       ...getHeaders(),
     },
-    body: JSON.stringify({ ciphertext: data })
+    body: JSON.stringify(payload)
   });
   const response = await fetch(request);
   if (!response.ok) {
diff --git a/src/api/transit/transitEncrypt.ts b/src/api/transit/transitEncrypt.ts
index 0d7d271..82f9c17 100644
--- a/src/api/transit/transitEncrypt.ts
+++ b/src/api/transit/transitEncrypt.ts
@@ -5,10 +5,14 @@ type EncryptionResult = {
   ciphertext: string;
 }
 
+type EncryptionPayload = {
+  plaintext: string;
+}
+
 export async function transitEncrypt(
   baseMount: string,
   name: string,
-  data: string
+  payload: EncryptionPayload
 ): Promise<EncryptionResult> {
   const request = new Request(appendAPIURL(removeDoubleSlash(`/v1/${baseMount}/encrypt/${name}`)), {
     method: 'POST',
@@ -16,7 +20,7 @@ export async function transitEncrypt(
       'Content-Type': 'application/json',
       ...getHeaders(),
     },
-    body: JSON.stringify({ plaintext: data })
+    body: JSON.stringify(payload)
   });
   const response = await fetch(request);
   if (!response.ok) {
diff --git a/src/pages/Transit/TransitDecrypt.ts b/src/pages/Transit/TransitDecrypt.ts
index 363e29f..f5e9313 100644
--- a/src/pages/Transit/TransitDecrypt.ts
+++ b/src/pages/Transit/TransitDecrypt.ts
@@ -80,7 +80,7 @@ export class TransitDecryptPage extends Page {
 
   async transitDecryptFormHandler(): Promise<void> {
     const formData = new FormData(this.transitDecryptForm);
-  
+
     const decodeBase64 = formData.get("decodeBase64Checkbox") as string;
 
     let ciphertext = formData.get("ciphertext") as string;
@@ -90,7 +90,12 @@ export class TransitDecryptPage extends Page {
       ciphertext = atob((await fileToBase64(ciphertext_file) as string).replace("data:text/plain;base64,", ""));
     }
 
-    transitDecrypt(pageState.currentBaseMount, pageState.currentSecret, ciphertext).then(res => {
+    try {
+      let res = await transitDecrypt(
+        pageState.currentBaseMount,
+        pageState.currentSecret,
+        { ciphertext: ciphertext },
+      );
       let plaintext = res.plaintext;
       if (decodeBase64 == "on") {
         plaintext = atob(plaintext);
@@ -98,9 +103,9 @@ export class TransitDecryptPage extends Page {
       const modal = CopyableModal(i18next.t("transit_decrypt_decryption_result_modal_title"), plaintext);
       document.body.querySelector("#pageContent").appendChild(modal);
       UIkit.modal(modal).show();
-    }).catch(e => {
+    } catch (e) {
       setErrorText(`API Error: ${e.message}`);
-    });
+    }
   }
 
   get titleSuffix(): string {
diff --git a/src/pages/Transit/TransitEncrypt.ts b/src/pages/Transit/TransitEncrypt.ts
index b14844f..2ba028e 100644
--- a/src/pages/Transit/TransitEncrypt.ts
+++ b/src/pages/Transit/TransitEncrypt.ts
@@ -81,7 +81,7 @@ export class TransitEncryptPage extends Page {
     }.bind(this));
   }
 
- async transitEncryptFormHandler(): Promise<void> {
+  async transitEncryptFormHandler(): Promise<void> {
     const formData = new FormData(this.transitEncryptForm);
 
     const base64Checkbox = formData.get("base64Checkbox") as string;
@@ -96,14 +96,18 @@ export class TransitEncryptPage extends Page {
       plaintext = base64Checkbox == "on" ? plaintext : btoa(plaintext);
     }
 
-
-    transitEncrypt(pageState.currentBaseMount, pageState.currentSecret, plaintext).then(res => {
+    try {
+      let res = await transitEncrypt(
+        pageState.currentBaseMount,
+        pageState.currentSecret,
+        { plaintext: plaintext }
+      );
       const modal = CopyableModal(i18next.t("transit_encrypt_encryption_result_modal_title"), res.ciphertext);
       document.body.querySelector("#pageContent").appendChild(modal);
       UIkit.modal(modal).show();
-    }).catch(e => {
+    } catch (e) {
       setErrorText(`API Error: ${e.message}`);
-    });
+    }
   }
 
   get titleSuffix(): string {