如何在Golang的RESTful API中返回不带转义字符串的Json数据

Question

I have written an API with Golang. This API does receive data from other services then it responses to users in type of JSON string. Here is the problems I got.

type message struct {
    Data string `json:"data"`
}

func test(w http.ResponseWriter, r *http.Request) {
    w.Header().Set("Content-Type", "application/json")
    data := // Retrieve message that contain backslash
    json.NewEncoder(w).Encode(message{Data: data})
}

` If there is a backslash in data that receive from other API. This API will send the response with double backslashes.

Example.

Received data: "asdasdasd\asdasdasd"

Response data: {"data": "asdasdasd\\asdasdasd"}

I have try to figure this out. Here what I got. All of this will be fine if I try to print out in the screen by using fmt.Println().

I only get problem when I try to send those out put in JSON string. Therefore, is there any way to send those data without double backslashes?

Answer 1

You can create a custom method and replace double backslashes with a single one.
Something like that:

func JSONMarshal(v interface{}, backslashEscape bool) ([]byte, error) {
    b, err := json.Marshal(v)

    if backslashEscape {
        b = bytes.Replace(b, []byte(`\\`), []byte(`\`), -1)
    }
    return b, err
}

The json/encoder packages has also DisableHTMLEscaping, if set to true, default is false, it allows you to escape HTML chars.