go: json.Unmarshal(data, slice)

package main

import (
	"encoding/json"
	"fmt"
)

func main() {
	cases := []struct {
		in []byte
	}{
		{
			in: []byte(`[]`),
		},
		{
			in: []byte(`null`),
		},
		{
			in: []byte(``),
		},
		{
			in: []byte(nil),
		},
	}
	for _, tt := range cases {
		out := []string{}
		err := json.Unmarshal(tt.in, &out)
		if err != nil {
			fmt.Printf("FAIL: %#v, err: %v\n", []byte(tt.in), err)
		} else {
			fmt.Printf("PASS: %s, out: %#v\n", []byte(tt.in), out)
		}
	}
}

PASS: [], out: []string{}
PASS: null, out: []string(nil)
FAIL: []byte{}, err: unexpected end of JSON input
FAIL: []byte(nil), err: unexpected end of JSON input