diff --git a/package.json b/package.json
index 107fe58..84a65a8 100644
--- a/package.json
+++ b/package.json
@@ -18,6 +18,7 @@
         "dotenv": "^16.0.3",
         "express": "^4.18.2",
         "moment": "^2.30.1",
+        "multer": "^1.4.5-lts.1",
         "nodemon": "^3.1.7",
         "pg": "^8.10.0",
         "reflect-metadata": "^0.2.2",
@@ -30,6 +31,7 @@
     "devDependencies": {
         "@types/cors": "^2.8.14",
         "@types/express": "^4.17.17",
+        "@types/multer": "^1.4.12",
         "@types/node": "^22.7.3",
         "@types/swagger-ui-express": "^4.1.3",
         "@types/uuid": "^10.0.0",
diff --git a/src/controller/credential_controller.ts b/src/controller/credential_controller.ts
index 72fbe5e..2e611ed 100644
--- a/src/controller/credential_controller.ts
+++ b/src/controller/credential_controller.ts
@@ -17,6 +17,7 @@ import { Cred } from '../entity/Cred';
 import { Schema } from '../entity/Schema';
 import { dataSource } from '../dbconfig';
 import { extractCredentialFields } from '../utils/CredentialUtils';
+import { MulterRequest } from '../types/type';
 const { CHAIN_SPACE_ID, CHAIN_SPACE_AUTH } = process.env;
 
 export async function issueVC(req: express.Request, res: express.Response) {
@@ -274,19 +275,24 @@ export async function revokeCred(req: express.Request, res: express.Response) {
   }
 }
 
+
+
+
 export async function documentHashOnChain(
-  req: express.Request,
+  req: MulterRequest,
   res: express.Response
 ) {
-  try {
-    const data = req.body;
-    const api = Cord.ConfigService.get('api');
-    // const content: any = fs.readFileSync('./package.json');
-    const content = JSON.stringify(data);
 
-    const hashFn = crypto.createHash('sha256');
-    hashFn.update(content);
-    let digest = `0x${hashFn.digest('hex')}`;
+  try {
+// Ensure a file is uploaded
+if (!req.file) {
+  return res.status(400).json({ err: "No file uploaded" });
+}
+const api = Cord.ConfigService.get('api');
+// Compute SHA-256 hash of the file buffer
+const hashFn = crypto.createHash("sha256");
+hashFn.update(req.file.buffer);
+const digest = `0x${hashFn.digest("hex")}`;
 
     const docProof = await Vc.getCordProofForDigest(
       digest as `0x${string}`,
@@ -312,8 +318,8 @@ export async function documentHashOnChain(
     console.log(`✅ Statement element registered - ${statement1}`);
 
     return res.status(200).json({ result: statement1 });
-  } catch (error) {
+  } catch (error:any) {
     console.log('errr: ', error);
-    return res.status(400).json({ err: error });
+    return res.status(400).json({ err: error.message ? error.message : error });
   }
 }
diff --git a/src/index.ts b/src/index.ts
index 1070326..5108b05 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,12 +11,17 @@ import {
 } from './controller/credential_controller';
 import { generateDid, resolveDid } from './controller/did_controller';
 import app from './server';
+import multer from "multer";
 
 const { PORT } = process.env;
 
 const credentialRouter = express.Router({ mergeParams: true });
 const schemaRouter = express.Router({ mergeParams: true });
 const didRouter = express.Router({ mergeParams: true });
+const upload = multer({
+  storage: multer.memoryStorage(),
+  limits: { fileSize: 3 * 1024 * 1024 }, // 3MB limit
+});
 
 credentialRouter.post('/', async (req, res) => {
   return await issueVC(req, res);
@@ -50,7 +55,7 @@ app.use('/api/v1/schema', schemaRouter);
 app.use('/api/v1/cred', credentialRouter);
 app.use('/api/v1/did', didRouter);
 
-app.post('/api/v1/docHash', async (req, res) => {
+app.post("/api/v1/docHash", upload.single("file"), async (req, res) => {
   return await documentHashOnChain(req, res);
 });
 
@@ -58,6 +63,15 @@ app.get('/:id/did.json', async (req, res) => {
   return await resolveDid(req, res);
 });
 
+app.use((err: any, req: express.Request, res: express.Response, next: express.NextFunction) => {
+  if (err instanceof multer.MulterError) {
+    if (err.code === "LIMIT_FILE_SIZE") {
+      return res.status(400).json({ err: "❌ File size exceeds 3MB limit!" });
+    }
+  }
+  next(err);
+});
+
 app.get('/*', async (req, res) => {
   return res.json({
     message: 'check https://docs.dhiway.com/api for details of the APIs',
diff --git a/src/types/type.d.ts b/src/types/type.d.ts
new file mode 100644
index 0000000..862c0b9
--- /dev/null
+++ b/src/types/type.d.ts
@@ -0,0 +1,6 @@
+import { Request } from "express";
+import { File } from "multer";
+
+export interface MulterRequest extends Request {
+  file?: File;
+}
\ No newline at end of file