How to check string is in json format

Question

I want to create a function to receive an input string which can be string in json format or just a string. For example, something easy like following function.

Answer 1

For example,

package main

import (
    "encoding/json"
    "fmt"
)

func isJSONString(s string) bool {
    var js string
    err := json.Unmarshal([]byte(s), &js)
    return err == nil
}

func main() {
    fmt.Println(isJSONString(`"Platypus"`))
    fmt.Println(isJSONString(`Platypus`))
}

Output:

true
false