diff --git a/src/controllers/case.controller.ts b/src/controllers/case.controller.ts
index fd550bd..6f21f57 100644
--- a/src/controllers/case.controller.ts
+++ b/src/controllers/case.controller.ts
@@ -2,6 +2,7 @@ import { Response } from 'express';
 import { supabase } from '../lib/supabase';
 import { AuthenticatedRequest } from '../middleware/auth';
 import { runDocumentAnalysis } from './document.controller';
+import { findOrCreateCaseByTitle } from '../lib/caseLookup';
 
 export const createCase = async (req: AuthenticatedRequest, res: Response) => {
   try {
@@ -72,6 +73,36 @@ export const summarizeCase = async (req: AuthenticatedRequest, res: Response) =>
   }
 };
 
+// UYAP Evrak İndirici eklentisinin "Taraf Bilgileri" sekmesinden yakaladığı
+// davacı/davalı/sanık + vekil bilgisini kaydeder. AI'nin OCR metninden tahmin
+// ettiği "Taraflar" alanından çok daha güvenilir — doğrudan UYAP'ın yapılandırılmış
+// verisi. case_title ile eşleştirme registerLocalDocument ile aynı mantık.
+export const updateCaseParties = async (req: AuthenticatedRequest, res: Response) => {
+  try {
+    const userId = req.user?.id;
+    const { case_title, parties } = req.body || {};
+
+    if (!case_title || !Array.isArray(parties) || parties.length === 0) {
+      return res.status(400).json({ error: 'case_title ve parties zorunludur.' });
+    }
+
+    const caseId = await findOrCreateCaseByTitle(userId as string, case_title);
+
+    const { data, error } = await supabase
+      .from('cases')
+      .update({ parties })
+      .eq('id', caseId)
+      .select('id, title, parties')
+      .single();
+    if (error) throw error;
+
+    res.json({ case: data });
+  } catch (error: any) {
+    console.error('Update Case Parties Error:', error);
+    res.status(500).json({ error: error.message || 'Internal Server Error' });
+  }
+};
+
 export const deleteCase = async (req: AuthenticatedRequest, res: Response) => {
   try {
     const { caseId } = req.params;
diff --git a/src/controllers/document.controller.ts b/src/controllers/document.controller.ts
index 4061ab7..8c9f480 100644
--- a/src/controllers/document.controller.ts
+++ b/src/controllers/document.controller.ts
@@ -3,6 +3,7 @@ import { supabase } from '../lib/supabase';
 import { AuthenticatedRequest } from '../middleware/auth';
 import * as officeParser from 'officeparser';
 import Tesseract from 'tesseract.js';
+import { findOrCreateCaseByTitle } from '../lib/caseLookup';
 const heicConvert = require('heic-convert');
 
 const ANALYSIS_SYSTEM_PROMPT = `
@@ -65,27 +66,7 @@ export const registerLocalDocument = async (req: AuthenticatedRequest, res: Resp
       return res.status(400).json({ error: 'case_title, filename ve extracted_text zorunludur.' });
     }
 
-    // Dava başlığına göre mevcut case'i bul (case-insensitive), yoksa oluştur.
-    const { data: existing } = await supabase
-      .from('cases')
-      .select('id, title')
-      .eq('user_id', userId)
-      .ilike('title', case_title)
-      .limit(1)
-      .maybeSingle();
-
-    let caseId: string;
-    if (existing) {
-      caseId = existing.id;
-    } else {
-      const { data: newCase, error: caseError } = await supabase
-        .from('cases')
-        .insert([{ title: String(case_title).slice(0, 200), user_id: userId }])
-        .select('id')
-        .single();
-      if (caseError) throw caseError;
-      caseId = newCase.id;
-    }
+    const caseId = await findOrCreateCaseByTitle(userId as string, case_title);
 
     const { data: documentRecord, error: docError } = await supabase
       .from('documents')
diff --git a/src/lib/caseLookup.ts b/src/lib/caseLookup.ts
new file mode 100644
index 0000000..a1c8d2a
--- /dev/null
+++ b/src/lib/caseLookup.ts
@@ -0,0 +1,24 @@
+import { supabase } from './supabase';
+
+// UYAP'tan gelen dava başlığına göre (case-insensitive) kullanıcının mevcut case'ini
+// bulur, yoksa oluşturur. registerLocalDocument ve updateCaseParties'in ortak kullandığı
+// eşleştirme mantığı — ikisi de aynı case_title string'iyle çalışıyor.
+export async function findOrCreateCaseByTitle(userId: string, caseTitle: string): Promise<string> {
+  const { data: existing } = await supabase
+    .from('cases')
+    .select('id')
+    .eq('user_id', userId)
+    .ilike('title', caseTitle)
+    .limit(1)
+    .maybeSingle();
+
+  if (existing) return existing.id;
+
+  const { data: newCase, error } = await supabase
+    .from('cases')
+    .insert([{ title: String(caseTitle).slice(0, 200), user_id: userId }])
+    .select('id')
+    .single();
+  if (error) throw error;
+  return newCase.id;
+}
diff --git a/src/routes/case.routes.ts b/src/routes/case.routes.ts
index 92d9bc7..c004510 100644
--- a/src/routes/case.routes.ts
+++ b/src/routes/case.routes.ts
@@ -1,11 +1,12 @@
 import { Router } from 'express';
 import { requireAuth } from '../middleware/auth';
-import { createCase, deleteCase, summarizeCase } from '../controllers/case.controller';
+import { createCase, deleteCase, summarizeCase, updateCaseParties } from '../controllers/case.controller';
 
 const router = Router();
 
 router.post('/', requireAuth, createCase);
 router.delete('/:caseId', requireAuth, deleteCase);
 router.post('/:caseId/summarize', requireAuth, summarizeCase);
+router.post('/parties', requireAuth, updateCaseParties);
 
 export default router;