Benchmark encoding json strings in Go (gjson, jsoniter, encoding/json)

json_test.go

package main

import (
	"encoding/json"
	"testing"

	jsoniter "github.com/json-iterator/go"
	"github.com/tidwall/gjson"
)

var inputs = []string{
	`""`,
	`"ascii"`,
	`"ascii with \n line break"`,
	`"emoji KO \ud83d\udd13, \ud83c\udfc3 OK \u2764\ufe0f"`,
	`"extended 的情况下解"`,
	`"control \u0000"`,
	`"escapes \t\r\n >><<"`,
	`"_\ufffd\u000b\ufffd\ufffd|X!\ufffd\ufffdU\u0026\ufffd\u001a\ufffd\u0004"`,
}

var simple = `"hello world"`

func BenchmarkJSONString_GJSON_Simple(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = string(gjson.AppendJSONString(nil, simple))
	}
}

func BenchmarkJSONString_GJSON_Extended(b *testing.B) {
	for i := 0; i < b.N; i++ {
		_ = string(gjson.AppendJSONString(nil, inputs[i&(len(inputs)-1)]))
	}
}

func BenchmarkJSONString_GO_Simple(b *testing.B) {
	bsimple := []byte(simple)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		var s string
		json.Unmarshal(bsimple, &s)
	}
}

func BenchmarkJSONString_GO_Extended(b *testing.B) {
	binputs := make([][]byte, len(inputs))
	for i := 0; i < len(inputs); i++ {
		binputs[i] = []byte(inputs[i])
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		var s string
		json.Unmarshal(binputs[i&(len(inputs)-1)], &s)
	}
}

func BenchmarkJSONString_JSONIter_Simple(b *testing.B) {
	bsimple := []byte(simple)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		var s string
		jsoniter.Unmarshal(bsimple, &s)
	}
}

func BenchmarkJSONString_JSONIter_Extended(b *testing.B) {
	binputs := make([][]byte, len(inputs))
	for i := 0; i < len(inputs); i++ {
		binputs[i] = []byte(inputs[i])
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		var s string
		jsoniter.Unmarshal(binputs[i&(len(inputs)-1)], &s)
	}
}

go test -bench .

goos: darwin
goarch: arm64
pkg: github.com/tidwall/gjson/main
BenchmarkJSONString_GJSON_Simple-10         	18116595	        66.20 ns/op
BenchmarkJSONString_GJSON_Extended-10       	10743160	       111.5 ns/op
BenchmarkJSONString_GO_Simple-10            	 8227428	       141.4 ns/op
BenchmarkJSONString_GO_Extended-10          	 5182388	       233.5 ns/op
BenchmarkJSONString_JSONIter_Simple-10      	16021922	        73.91 ns/op
BenchmarkJSONString_JSONIter_Extended-10    	 7400431	       162.4 ns/op