Empty JSON array via Go json.Marshal or []byte literal

empty-array-json.go

package main

import (
	"encoding/json"
	"fmt"

	"github.com/kr/pretty"
)

func main() {
	// https://go.dev/play/p/AskmilHGfRf
  
	// Not this: it becomes the JSON string "[]"
	result0, _ := json.Marshal(`[]`)
	fmt.Println("result0\n", string(result0[:]), "\n", result0, "\n", pretty.Sprint(result0), "\n")
	
	// Not this: it becomes JSON null
	var nilSlice []string
	result1, _ := json.Marshal(nilSlice)
	fmt.Println("result1\n", string(result1[:]), "\n", result1, "\n", pretty.Sprint(result1), "\n")
	
	// This: a slice literal of any type becomes JSON []:
	result2, _ := json.Marshal([]interface{}{})
	fmt.Println("result2\n", string(result2[:]), "\n", result2, "\n", pretty.Sprint(result2), "\n")

	// Or use a []byte literal for constants, etc.
	emptyArrayJSON := []byte{91, 93}
	fmt.Println("emptyArrayJSON\n", string(emptyArrayJSON[:]), "\n", emptyArrayJSON, "\n", pretty.Sprint(emptyArrayJSON), "\n")
}