Different ways to validate JSON string

package main

import (
	"encoding/json"
	"fmt"
)

var Object = `{
	"userId": 1,
	"id": 1,
	"title": "delectus aut autem",
	"completed": false
}`
var Array = `[{"key": "value1"}, {"key": "value2"}]`

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

func main() {
	val1 := isJSON(Object)
	fmt.Println(val1)

	val2 := isJSON(Array)
	fmt.Println(val2)
}

true
true

package main

import (
	"fmt"
	"encoding/json"
)

func main() {
       var tests = []string{
		`"Platypus"`,
		`Platypus`,
		`{"id":"1"}`,
		`{"id":"1}`,
	}

	for _, t := range tests {
		fmt.Printf("Is valid: (%s) = %v\n", t, json.Valid([]byte(t)))
		
	}

}

Is valid: ("Platypus") = true
Is valid: (Platypus) = false
Is valid: ({"id":"1"}) = true
Is valid: ({"id":"1}) = false