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

how about you use something like this:

if err := json.Unmarshal(input, temp_object); err != nil {
    fmt.Println("it's normal string!")
} else {
    fmt.Println("it's json!")
}