How to Unmarshall Escaped JSON Strings in Go?

Unmarshalling Escaped JSON Strings with Go

When using Sockjs with Go, you may encounter issues parsing escaped JSON strings received from JavaScript clients as []byte. This can lead to error messages like "json: cannot unmarshal string into Go value". To resolve this issue, you can use a simple method to unescape the string before unmarshalling.

Using strconv.Unquote

strconv.Unquote() is a built-in Go function that removes escaped characters from a string. By applying it to the received JSON string, you can effectively unescape it.

Here's how you can do it:

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

type Msg struct {
    Channel string
    Name string
    Msg string
}

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)
}

In this example, the escaped JSON string is successfully unescaped using strconv.Unquote(), and the data is parsed into the Msg struct without errors.

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