Unescaped control character around character 981.Error while parsing JSON

问题

Error Domain=NSCocoaErrorDomain Code=3840 "Unescaped control character around character 981." UserInfo={NSDebugDescription=Unescaped control character around character 981.}

I am getting above error in response of request.

Below are lines of code:

Alamofire.request(.POST, urlStr, parameters: parameter, encoding: .JSON, headers: nil).validate().responseJSON {
            response in switch response.result {

            case .Success(let JSON):
                completionHandler(JSON as! NSDictionary)

            case.Failure(let Error):

                print(Error)
            }
        }

It gives JSON response in Postman.

Response which is I am getting in Postman:

{
  "orderdetails": {
    "status_code": "200",
    "status_message": "Order details",
    "billingandshipping": {
      "billing": {
        "firstname": "first",
        "lastname": "last",
        "email": "aa@bbb.com",
        "address": "dasdesfrew",
        "city": "Rajkot",
        "area": "University Road",
        "pincode": "360003",
        "phone": "1234567890",
        "mobileno": "1234567891"
      },
      "shipping": {
        "firstname": "first",
        "lastname": "last",
        "email": "aa@bbb.com",
        "address": "dasdesfrew",
        "city": "dasdesfrew",
        "area": "dcdc",
        "pincode": "360003",
        "phone": "1234567890",
        "mobileno": "1234567891"
      }
    },
    "orders": [
      {
        "order_id": "77",
        "order_date": "09-08-2016 13:05:29",
        "delivery_date": "10-08-2016",
        "order_items": [
          {
            "Sr": "1",
            "product_name": "Lemon",
            "gujtitle": "લીંબુ ",
            "product_code": "000057",
            "product_price": "108.00",
            "product_qty": "2",
            "unit": "1 kg.",
            "product_total": "216"
          }
        ],
        "final_total": "216.00",
        "shipping_cost": "0.00",
        "order_total": "216.00",
        "discount_type": "null",
        "discount_amount": "null",
        "coupon_name": "null",
        "comment": "gdhdj\nfghd.g\nghj\n\n\n\n\n\n\n\n\n\n.."
      }
    ]
  }
}

回答1:

As per you told there is problem related to "\n"

So i suggest you can add "\" which will work for you like below

"\n"=> "\\n"

Because this are special character call backspace character.

Hope you get your answer

回答2:

NSLog the NSData that you received and have a look what you find around byte 981. The thing with unescaped control characters is that they are invisible, so you can't see them in an NSString, but you'll see them in the NSData.

If your data has length 981 bytes or very close then there's a chance that your code processed incomplete JSON data which will almost always fail; that's something you need to fix. If there is a control character between some items (say between two array elements) then this might be a bug in the server code.

来源：https://stackoverflow.com/questions/39247981/unescaped-control-character-around-character-981-error-while-parsing-json

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