diff --git a/kubo-rpc-server/README.md b/kubo-rpc-server/README.md
index 38a1bf67a..c45811a22 100644
--- a/kubo-rpc-server/README.md
+++ b/kubo-rpc-server/README.md
@@ -15,7 +15,7 @@ To see how to make this your own, look here:
 [README]((https://openapi-generator.tech))
 
 - API version: 0.9.0
-- Build date: 2023-11-13T20:39:18.296854378Z[Etc/UTC]
+- Build date: 2023-11-15T16:13:27.108848Z[Etc/UTC]
 
 
 
diff --git a/kubo-rpc-server/api/openapi.yaml b/kubo-rpc-server/api/openapi.yaml
index b4e13d99f..fdceb3037 100644
--- a/kubo-rpc-server/api/openapi.yaml
+++ b/kubo-rpc-server/api/openapi.yaml
@@ -210,7 +210,7 @@ paths:
         content:
           multipart/form-data:
             schema:
-              $ref: '#/components/schemas/_dag_put_post_request'
+              $ref: '#/components/schemas/_block_put_post_request'
       responses:
         "200":
           content:
@@ -558,6 +558,14 @@ components:
       - Cid
       - RemPath
       type: object
+    _block_put_post_request:
+      properties:
+        file:
+          format: binary
+          type: string
+      required:
+      - file
+      type: object
     _block_put_post_200_response:
       example:
         Size: 0.8008281904610115
diff --git a/kubo-rpc-server/examples/client/main.rs b/kubo-rpc-server/examples/client/main.rs
index c10c28026..41bdbb590 100644
--- a/kubo-rpc-server/examples/client/main.rs
+++ b/kubo-rpc-server/examples/client/main.rs
@@ -121,7 +121,7 @@ fn main() {
         }
         Some("BlockPutPost") => {
             let result = rt.block_on(client.block_put_post(
-                swagger::ByteArray(Vec::from("BYTE_ARRAY_DATA_HERE")),
+                swagger::ByteArray(Vec::from("BINARY_DATA_HERE")),
                 None,
                 None,
                 None,
diff --git a/kubo-rpc-server/src/client/mod.rs b/kubo-rpc-server/src/client/mod.rs
index fc1f69489..9719706d0 100644
--- a/kubo-rpc-server/src/client/mod.rs
+++ b/kubo-rpc-server/src/client/mod.rs
@@ -560,17 +560,22 @@ where
 
             // For each parameter, encode as appropriate and add to the multipart body as a stream.
 
-            let file_vec = param_file.to_vec();
-
-            let file_mime = match mime_0_2::Mime::from_str("application/octet-stream") {
-                Ok(mime) => mime,
-                Err(err) => return Err(ApiError(format!("Unable to get mime type: {:?}", err))),
+            let file_str = match serde_json::to_string(&param_file) {
+                Ok(str) => str,
+                Err(e) => {
+                    return Err(ApiError(format!(
+                        "Unable to serialize file to string: {}",
+                        e
+                    )))
+                }
             };
 
+            let file_vec = file_str.as_bytes().to_vec();
+            let file_mime =
+                mime_0_2::Mime::from_str("application/json").expect("impossible to fail to parse");
             let file_cursor = Cursor::new(file_vec);
 
-            let filename = None as Option<&str>;
-            multipart.add_stream("file", file_cursor, filename, Some(file_mime));
+            multipart.add_stream("file", file_cursor, None as Option<&str>, Some(file_mime));
 
             let mut fields = match multipart.prepare() {
                 Ok(fields) => fields,
diff --git a/kubo-rpc-server/src/server/mod.rs b/kubo-rpc-server/src/server/mod.rs
index f4f7ac396..0ba4ca6ad 100644
--- a/kubo-rpc-server/src/server/mod.rs
+++ b/kubo-rpc-server/src/server/mod.rs
@@ -412,9 +412,19 @@ where
                                 let param_file = match field_file {
                                     Some(field) => {
                                         let mut reader = field[0].data.readable().expect("Unable to read field for file");
-                                        let mut data = vec![];
-                                        reader.read_to_end(&mut data).expect("Reading saved binary data should never fail");
-                                        swagger::ByteArray(data)
+                                        let mut data = String::new();
+                                        reader.read_to_string(&mut data).expect("Reading saved String should never fail");
+                                        let file_model: swagger::ByteArray = match serde_json::from_str(&data) {
+                                            Ok(model) => model,
+                                            Err(e) => {
+                                                return Ok(
+                                                    Response::builder()
+                                                    .status(StatusCode::BAD_REQUEST)
+                                                    .body(Body::from(format!("file data does not match API definition : {}", e)))
+                                                    .expect("Unable to create Bad Request due to missing required form parameter file"))
+                                            }
+                                        };
+                                        file_model
                                     },
                                     None => {
                                         return Ok(
diff --git a/kubo-rpc/kubo-rpc.yaml b/kubo-rpc/kubo-rpc.yaml
index 9147613f1..34e9c1040 100644
--- a/kubo-rpc/kubo-rpc.yaml
+++ b/kubo-rpc/kubo-rpc.yaml
@@ -257,7 +257,7 @@ paths:
               properties:
                 file:
                   type: string
-                  format: byte
+                  format: binary
       responses:
         '200':
           description: success