How to Safely Unmarshal Escaped JSON Strings in Go?

Unescaping JSON Strings for Unmarshaling

When working with Sockjs and Go, you may encounter issues parsing JSON strings sent from a JavaScript client due to escaping. The JavaScript client may escape the strings and send them as []byte, leading to unmarshaling difficulties.

To resolve this, you can utilize the strconv.Unquote function to remove the escaping from the JSON string. This function takes a string as an argument and returns an unescaped version.

Solution:

import (
    "encoding/json"
    "fmt"
    "strconv"
)

// Code goes here.

func main() {
    var msg Msg
    var val []byte = []byte(`"{\"channel\":\"buu\",\"name\":\"john\", \"msg\":\"doe\"}"`)

    s, _ := strconv.Unquote(string(val))

    err := json.Unmarshal([]byte(s), &msg)

    fmt.Println(s)
    fmt.Println(err)
    fmt.Println(msg.Channel, msg.Name, msg.Msg)
}

Output:

{"channel":"buu","name":"john","msg":"doe"}
<nil>
buu john doe

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