Parse escaped json string in Golang

Question

Say I have this json string:

{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\",\"D\":2,\"E\":\"e\"}

I want to convert above string into struct:

{
  A string
  B string
  C string
  D int
  E string
}

Im not sure how to do that as I have do the quote and unquote but seems no success yet.

What are the quoting rules for the string? The answer depends on the quoting used. For example, if the string is JSON encoded JSON, then unmarshal twice. If the string uses Go quoting, use strconv.Unquote. — user5728991
– user5728991, Commented Jul 8, 2021 at 12:02

mfathirirhas · Accepted Answer · 2021-07-08 03:23:27Z

7

Wrap your incoming string before unquoting it like this:

s,err := strconv.Unquote(`"`+yourstring+`"`)

Then you can proceed with unmarshalling it.

answered Jul 8, 2021 at 3:23

mfathirirhas

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Burak Serdar · Accepted Answer · 2021-07-08 02:45:03Z

2

Somewhat of a hack, but the input string is how it would be encoded if it was in a JSON object, so you can do this:

x:=json.RawMessage(`"{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\",\"D\":2,\"E\":\"e\"}"`)
var v string
err:=json.Unmarshal(x,&v)
var x MyStruct
json.Unmarshal([]byte(v),&x)

edited Jul 8, 2021 at 2:45

answered Jul 8, 2021 at 2:14

Burak Serdar

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4 Comments

Jake Muller Over a year ago

i got error: invalid character '\\' looking for beginning of object key string

Jake Muller Over a year ago

I used a package where the function accept string as param, I read that param receiving this escaped json, convert it to rawmessage, unmarshall and got that error.

Burak Serdar Over a year ago

Raw message is []byte. It might've been easier to remove the backslashes.

jk2K Over a year ago

you can try this when strconv.Unquote not work(got invalid syntax), thanks a lot

Gopher · Accepted Answer · 2021-07-08 10:07:20Z

You can make use of Unquote method of strconv as suggested by mfathirirhas, I have created a small code depicting you scenario as follows:

package main

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

type response struct {
    A string
    B string
    C string
    D int
    E string
}

func main() {

    str := (`"{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\",\"D\":2,\"E\":\"e\"}"`)
    fmt.Printf(str)
    s, err := strconv.Unquote(str)
    fmt.Println()
    fmt.Println(s, err)
    var resp response
    if err := json.Unmarshal([]byte(s), &resp); err != nil {
        panic(err)
    }
    fmt.Println(resp)

}

Output:

"{\"A\":\"a\",\"B\":\"b\",\"C\":\"c\",\"D\":2,\"E\":\"e\"}"
{"A":"a","B":"b","C":"c","D":2,"E":"e"} <nil>
{a b c 2 e}

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