github.com/json-iterator/go v1.1.10

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:golang/github.com/json-iterator/go@v1.1.10
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:golang/github.com/json-iterator/go@v1.1.10
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

{"case":{"caseId":"case:sha256:1c8284f42b756c50f112cc0e71cc4f3412412c9d68c33bbae2de0b5300eb4f22","contract":["jsoniter.Marshal serializes a struct to valid JSON bytes","jsoniter.Unmarshal deserializes JSON bytes into a struct","jsoniter.NewEncoder streams encoded JSON directly to an io.Writer","jsoniter.NewDecoder decodes JSON streams from an io.Reader","jsoniter.NewStream writes formatted JSON arrays to an io.Writer"],"goal":"verify pkg:golang/github.com/json-iterator/go@v1.1.10","kind":"HOW","packages":["pkg:golang/github.com/json-iterator/go@v1.1.10"],"schemaVersion":1},"contractCommand":["go","run","./test"],"environment":{"arch":"x64","distro":"ubuntu","ecosystem":"golang","language":"go","libc":"glibc","libcVersion":"2.39","os":"linux","osVersionBucket":"24","packageManager":"go","packageManagerVersion":"1.26.6","runtime":"go","runtimeVersion":"1.26.6","schemaVersion":1},"license":"MIT-0","packages":["pkg:golang/github.com/json-iterator/go@v1.1.10"],"schemaVersion":1,"subject":"pkg:golang/github.com/json-iterator/go@v1.1.10","verifierAdapter":"golang@1"}

module sample

go 1.26.6

require github.com/json-iterator/go v1.1.10

require (
	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
	github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 // indirect
)

github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
github.com/json-iterator/go v1.1.10 h1:Kz6Cvnvv2wGdaG/V8yMvfkmNiXq9Ya2KUv4rouJJr68=
github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 h1:ZqeYNhU3OHLH3mGKHDcjJRFFRrJa6eAM5H+CtDdOsPc=
github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742 h1:Esafd1046DLDQ0W1YjYsBW+p8U2u7vzgW2SQVmlNazg=
github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=

package sample

import (
	"io"

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

// User represents a simple data model for serialization and deserialization.
type User struct {
	ID   int      `json:"id"`
	Name string   `json:"name"`
	Tags []string `json:"tags,omitempty"`
}

// MarshalUser serializes a User struct to JSON bytes using jsoniter.Marshal.
func MarshalUser(u User) ([]byte, error) {
	return jsoniter.Marshal(u)
}

// UnmarshalUser deserializes JSON bytes into a User struct using jsoniter.Unmarshal.
func UnmarshalUser(data []byte) (User, error) {
	var u User
	err := jsoniter.Unmarshal(data, &u)
	return u, err
}

// EncodeUser writes a User struct to an io.Writer using jsoniter.NewEncoder.
func EncodeUser(w io.Writer, u User) error {
	return jsoniter.NewEncoder(w).Encode(u)
}

// DecodeUser reads a User struct from an io.Reader using jsoniter.NewDecoder.
func DecodeUser(r io.Reader) (User, error) {
	var u User
	err := jsoniter.NewDecoder(r).Decode(&u)
	return u, err
}

// StreamValues streams multiple JSON values directly to a buffer.
func StreamValues(w io.Writer, values []string) error {
	stream := jsoniter.NewStream(jsoniter.ConfigDefault, w, 256)
	stream.WriteArrayStart()
	for i, v := range values {
		if i > 0 {
			stream.WriteMore()
		}
		stream.WriteString(v)
	}
	stream.WriteArrayEnd()
	return stream.Flush()
}

{
  "schemaVersion": 1,
  "goal": "verify pkg:golang/github.com/json-iterator/go@v1.1.10",
  "kind": "HOW",
  "packages": [
    "pkg:golang/github.com/json-iterator/go@v1.1.10"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

package main

import (
	"bytes"
	"fmt"
	"os"
	"reflect"

	"sample"
)

func main() {
	// Contract 1: jsoniter.Marshal serializes a struct to valid JSON bytes
	{
		user := sample.User{ID: 1, Name: "Alice", Tags: []string{"admin", "user"}}
		data, err := sample.MarshalUser(user)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 1]: MarshalUser error: %v\n", err)
			os.Exit(1)
		}
		expected := `{"id":1,"name":"Alice","tags":["admin","user"]}`
		if string(data) != expected {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 1]: got %q, want %q\n", string(data), expected)
			os.Exit(1)
		}
	}

	// Contract 2: jsoniter.Unmarshal deserializes JSON bytes into a struct
	{
		input := []byte(`{"id":2,"name":"Bob","tags":["viewer"]}`)
		user, err := sample.UnmarshalUser(input)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 2]: UnmarshalUser error: %v\n", err)
			os.Exit(1)
		}
		expected := sample.User{ID: 2, Name: "Bob", Tags: []string{"viewer"}}
		if !reflect.DeepEqual(user, expected) {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 2]: got %+v, want %+v\n", user, expected)
			os.Exit(1)
		}
	}

	// Contract 3: jsoniter.NewEncoder streams encoded JSON directly to an io.Writer
	{
		var buf bytes.Buffer
		user := sample.User{ID: 3, Name: "Charlie"}
		err := sample.EncodeUser(&buf, user)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 3]: EncodeUser error: %v\n", err)
			os.Exit(1)
		}
		expected := "{\"id\":3,\"name\":\"Charlie\"}\n"
		if buf.String() != expected {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 3]: got %q, want %q\n", buf.String(), expected)
			os.Exit(1)
		}
	}

	// Contract 4: jsoniter.NewDecoder decodes JSON streams from an io.Reader
	{
		reader := bytes.NewReader([]byte(`{"id":4,"name":"Dana"}`))
		user, err := sample.DecodeUser(reader)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 4]: DecodeUser error: %v\n", err)
			os.Exit(1)
		}
		expected := sample.User{ID: 4, Name: "Dana"}
		if !reflect.DeepEqual(user, expected) {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 4]: got %+v, want %+v\n", user, expected)
			os.Exit(1)
		}
	}

	// Contract 5: jsoniter.NewStream writes formatted JSON arrays to an io.Writer
	{
		var buf bytes.Buffer
		items := []string{"red", "green", "blue"}
		err := sample.StreamValues(&buf, items)
		if err != nil {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 5]: StreamValues error: %v\n", err)
			os.Exit(1)
		}
		expected := `["red","green","blue"]`
		if buf.String() != expected {
			fmt.Fprintf(os.Stderr, "FAIL [Contract 5]: got %q, want %q\n", buf.String(), expected)
			os.Exit(1)
		}
	}

	fmt.Println("All contracts passed.")
}