How to Unmarshall Escaped JSON Strings in Go with SockJS?

Unmarshalling Escaped JSON Strings

When employing Sockjs with Go, one may encounter challenges when JavaScript clients transmit JSON data as escaped strings. This can lead to parsing errors like "json: cannot unmarshal string into Go value of type main.Msg."

Solution

To circumvent this issue, pre-process the JSON string using strconv.Unquote. Here's how it works:

package main

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

type Msg struct {
    Channel string
    Name   string
    Msg     string
}

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

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

    // Unmarshal the unquoted JSON string
    err := json.Unmarshal([]byte(s), &msg)

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

In this example, we use strconv.Unquote to remove the escape characters from the JSON string. Once unquoted, we proceed to unmarshal it into the Msg struct. This approach resolves the parsing error and allows us to access the data correctly.

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