diff --git a/packages/parsers/src/openapi/3.1/paths/__test__/request/MultipartFormDataPropertySchemaConverter.node.test.ts b/packages/parsers/src/openapi/3.1/paths/__test__/request/MultipartFormDataPropertySchemaConverter.node.test.ts
index ce4afc59b1..df25f0f9e1 100644
--- a/packages/parsers/src/openapi/3.1/paths/__test__/request/MultipartFormDataPropertySchemaConverter.node.test.ts
+++ b/packages/parsers/src/openapi/3.1/paths/__test__/request/MultipartFormDataPropertySchemaConverter.node.test.ts
@@ -123,7 +123,10 @@ describe("MultipartFormDataPropertySchemaConverterNode", () => {
     const result = converter.convert();
     expect(result).toEqual({
       type: "alias",
-      value: { type: "primitive", value: { type: "base64" } },
+      value: {
+        type: "primitive",
+        value: { type: "base64", mimeType: "image/jpeg" },
+      },
     });
   });
 });
diff --git a/packages/parsers/src/openapi/3.1/schemas/primitives/StringConverter.node.ts b/packages/parsers/src/openapi/3.1/schemas/primitives/StringConverter.node.ts
index 020b69e47c..280936c78b 100644
--- a/packages/parsers/src/openapi/3.1/schemas/primitives/StringConverter.node.ts
+++ b/packages/parsers/src/openapi/3.1/schemas/primitives/StringConverter.node.ts
@@ -43,6 +43,7 @@ export class StringConverterNode extends BaseOpenApiV3_1ConverterNodeWithExample
   minLength: number | undefined;
   maxLength: number | undefined;
   enum: EnumConverterNode | undefined;
+  mimeType: string | undefined;
 
   constructor(
     args: BaseOpenApiV3_1ConverterNodeConstructorArgs<StringConverterNode.Input>
@@ -108,6 +109,8 @@ export class StringConverterNode extends BaseOpenApiV3_1ConverterNodeWithExample
     this.minLength = this.input.minLength;
     this.maxLength = this.input.maxLength;
 
+    this.mimeType = this.input.contentMediaType;
+
     if (this.input.default != null && typeof this.input.default !== "string") {
       this.context.errors.warning({
         message: `Expected default value to be a string. Received ${this.input.default}`,
@@ -154,14 +157,21 @@ export class StringConverterNode extends BaseOpenApiV3_1ConverterNodeWithExample
       type: "alias",
       value: {
         type: "primitive",
-        value: {
-          type,
-          format: type === "string" ? this.format : undefined,
-          regex: this.regex,
-          minLength: this.minLength,
-          maxLength: this.maxLength,
-          default: this.default,
-        },
+        value:
+          type === "base64"
+            ? {
+                type,
+                mimeType: this.mimeType,
+                default: this.default,
+              }
+            : {
+                type,
+                format: type === "string" ? this.format : undefined,
+                regex: this.regex,
+                minLength: this.minLength,
+                maxLength: this.maxLength,
+                default: this.default,
+              },
       },
     };
   }