diff --git a/admin/src/api.js b/admin/src/api.js
index 8467ef6..6897e65 100644
--- a/admin/src/api.js
+++ b/admin/src/api.js
@@ -10,12 +10,22 @@ export function apiGet(path) {
     .catch(e => { throw new Error(e.message) })
 }
 
+// HTTP 非 2xx 时抛出服务端返回的错误信息（否则 409/500 被当正常 JSON 处理）
+function handleResponse(r) {
+  return r.json().then(j => {
+    if (!r.ok) {
+      throw new Error(j.error || j.message || `请求失败(${r.status})`)
+    }
+    return j
+  })
+}
+
 export function apiPost(path, body) {
   return fetch(path, {
     method: 'POST',
     headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${getToken()}` },
     body: JSON.stringify(body)
-  }).then(r => r.json())
+  }).then(handleResponse)
 }
 
 export function apiPut(path, body) {
@@ -23,12 +33,12 @@ export function apiPut(path, body) {
     method: 'PUT',
     headers: { 'Content-Type': 'application/json', Authorization: `Bearer ${getToken()}` },
     body: JSON.stringify(body)
-  }).then(r => r.json())
+  }).then(handleResponse)
 }
 
 export function apiDelete(path) {
   return fetch(path, {
     method: 'DELETE',
     headers: { Authorization: `Bearer ${getToken()}` }
-  }).then(r => r.json())
+  }).then(handleResponse)
 }