how to upload file in alamofire in multiformData?

Question

I need to upload an image with multipart/form-data i have tried :

 static func uploadFile(image: UIImage?, parameters:Parameter,onResponse:@escaping(_ result:Parameter)-> (),onFailure:@escaping(_ error:Error)->()){
        
        let url = "ip address"
        let imageData = image?.jpegData(compressionQuality: 0.7)
        let headers: HTTPHeaders = [
            "Authorization": TOKEN!
        ]
  
        Alamofire.upload(multipartFormData: { (multipartFormData) in
      
            multipartFormData.append("\(parameters.toJSON())".data(using: String.Encoding.utf8)!, withName: "entity")
    
            if let data = imageData{
                multipartFormData.append(data, withName: "mp3")
            }
            
        }, usingThreshold: UInt64.init(), to: url, method: .post, headers: getHeaders()) { (result) in
            
            switch result{
            case .success(let upload, _, _):
                upload.responseJSON { response in
                    print("Succesfully uploaded",response.error)
                    if let err = response.error{
                        return
                    }
                }
            case .failure(let error):
                print("Error in upload: \(error.localizedDescription)")
            }
        }
        
    }

I need to send an entity model and the Image. but I have to send the image as a formData, not in body.

note : sending image with a "file" key and class with "entity" key

i can not solve it in swift side ....

errors :

Succesfully uploaded Optional(Alamofire.AFError.responseSerializationFailed(reason: Alamofire.AFError.ResponseSerializationFailureReason.jsonSerializationFailed(error: Error Domain=NSCocoaErrorDomain Code=3840 "Invalid value around character 0." UserInfo={NSDebugDescription=Invalid value around character 0.})))

Answer 1

read comments first.

do not forget to add fileName even if you set your fileName one step before file uploading.

try to use ToJsonString() instead of using ToJson()