JSON decoding benchmarks

main.go

package main

import (
	"encoding/json/jsontext"
	"encoding/json/v2"
	"io"
	"net/http"
)

var input struct {
	Title  string   `json:"title"`
	Year   int      `json:"year"`
	Genres []string `json:"genres"`
}

func main() {}

func createMovieHandlerUnmarshal(w http.ResponseWriter, r *http.Request) {
	body, err := io.ReadAll(r.Body)
	if err != nil {
		http.Error(w, "The server encountered a problem and could not process your request", http.StatusInternalServerError)
		return
	}

	err = json.Unmarshal(body, &input)
	if err != nil {
		http.Error(w, "The server encountered a problem and could not process your request", http.StatusInternalServerError)
		return
	}
}

func createMovieHandlerUnmarshalRead(w http.ResponseWriter, r *http.Request) {
	err := json.UnmarshalRead(r.Body, &input)
	if err != nil {
		http.Error(w, "The server encountered a problem and could not process your request", http.StatusInternalServerError)
		return
	}
}

func createMovieHandlerUnmarshalDecode(w http.ResponseWriter, r *http.Request) {
	dec := jsontext.NewDecoder(r.Body)

	err := json.UnmarshalDecode(dec, &input)
	if err != nil {
		http.Error(w, "The server encountered a problem and could not process your request", http.StatusInternalServerError)
		return
	}
}

main_test.go

package main

import (
	"io"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

const body = `{"title":"Moana","year":2016,"genres":["animation","adventure"]}`

func BenchmarkUnmarshal(b *testing.B) {
	r := httptest.NewRequest(http.MethodGet, "/", nil)
	w := httptest.NewRecorder()

	for b.Loop() {
		r.Body = io.NopCloser(strings.NewReader(body))
		w.Body.Reset()
		createMovieHandlerUnmarshal(w, r)
	}
}

func BenchmarkUnmarshalRead(b *testing.B) {
	r := httptest.NewRequest(http.MethodGet, "/", nil)
	w := httptest.NewRecorder()

	for b.Loop() {
		r.Body = io.NopCloser(strings.NewReader(body))
		w.Body.Reset()
		createMovieHandlerUnmarshalRead(w, r)
	}
}

func BenchmarkUnmarshalDecode(b *testing.B) {
	r := httptest.NewRequest(http.MethodGet, "/", nil)
	w := httptest.NewRecorder()

	for b.Loop() {
		r.Body = io.NopCloser(strings.NewReader(body))
		w.Body.Reset()
		createMovieHandlerUnmarshalDecode(w, r)
	}
}