diff --git a/gen/genv3.go b/gen/genv3.go
deleted file mode 100644
index 8010660f2..000000000
--- a/gen/genv3.go
+++ /dev/null
@@ -1,202 +0,0 @@
-package gen
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"os"
-	"path"
-	"path/filepath"
-	"strings"
-	"text/template"
-	"time"
-
-	"github.com/sv-tools/openapi/spec"
-	"github.com/swaggo/swag"
-)
-
-type openAPITypeWriter func(*Config, *spec.OpenAPI) error
-
-func (g *Gen) writeDocOpenAPI(config *Config, openAPI *spec.OpenAPI) error {
-	var filename = "docs.go"
-
-	if config.InstanceName != swag.Name {
-		filename = config.InstanceName + "_" + filename
-	}
-
-	docFileName := path.Join(config.OutputDir, filename)
-
-	absOutputDir, err := filepath.Abs(config.OutputDir)
-	if err != nil {
-		return err
-	}
-
-	packageName := filepath.Base(absOutputDir)
-
-	docs, err := os.Create(docFileName)
-	if err != nil {
-		return err
-	}
-	defer docs.Close()
-
-	// Write doc
-	err = g.writeGoDocV3(packageName, docs, openAPI, config)
-	if err != nil {
-		return err
-	}
-
-	g.debug.Printf("create docs.go at %+v", docFileName)
-
-	return nil
-}
-
-func (g *Gen) writeJSONOpenAPI(config *Config, swagger *spec.OpenAPI) error {
-	var filename = "swagger.json"
-
-	if config.InstanceName != swag.Name {
-		filename = config.InstanceName + "_" + filename
-	}
-
-	jsonFileName := path.Join(config.OutputDir, filename)
-
-	b, err := g.jsonIndent(swagger)
-	if err != nil {
-		return err
-	}
-
-	err = g.writeFile(b, jsonFileName)
-	if err != nil {
-		return err
-	}
-
-	g.debug.Printf("create swagger.json at %+v", jsonFileName)
-
-	return nil
-}
-
-func (g *Gen) writeYAMLOpenAPI(config *Config, swagger *spec.OpenAPI) error {
-	var filename = "swagger.yaml"
-
-	if config.InstanceName != swag.Name {
-		filename = config.InstanceName + "_" + filename
-	}
-
-	yamlFileName := path.Join(config.OutputDir, filename)
-
-	b, err := g.json(swagger)
-	if err != nil {
-		return err
-	}
-
-	y, err := g.jsonToYAML(b)
-	if err != nil {
-		return fmt.Errorf("cannot covert json to yaml error: %s", err)
-	}
-
-	err = g.writeFile(y, yamlFileName)
-	if err != nil {
-		return err
-	}
-
-	g.debug.Printf("create swagger.yaml at %+v", yamlFileName)
-
-	return nil
-}
-
-func (g *Gen) writeGoDocV3(packageName string, output io.Writer, openAPI *spec.OpenAPI, config *Config) error {
-	generator, err := template.New("swagger_info").Funcs(template.FuncMap{
-		"printDoc": func(v string) string {
-			// Add schemes
-			v = "{\n    \"schemes\": {{ marshal .Schemes }}," + v[1:]
-			// Sanitize backticks
-			return strings.Replace(v, "`", "`+\"`\"+`", -1)
-		},
-	}).Parse(packageTemplateV3)
-	if err != nil {
-		return err
-	}
-
-	openAPISpec := spec.OpenAPI{
-		Components: openAPI.Components,
-		OpenAPI:    openAPI.OpenAPI,
-		Info: &spec.Extendable[spec.Info]{
-			Spec: &spec.Info{
-				Description:    "{{escape .Description}}",
-				Title:          "{{.Title}}",
-				Version:        "{{.Version}}",
-				TermsOfService: openAPI.Info.Spec.TermsOfService,
-				Contact:        openAPI.Info.Spec.Contact,
-				License:        openAPI.Info.Spec.License,
-				Summary:        openAPI.Info.Spec.Summary,
-			},
-			Extensions: openAPI.Info.Extensions,
-		},
-		ExternalDocs:      openAPI.ExternalDocs,
-		Paths:             openAPI.Paths,
-		WebHooks:          openAPI.WebHooks,
-		JsonSchemaDialect: openAPI.JsonSchemaDialect,
-		Security:          openAPI.Security,
-		Tags:              openAPI.Tags,
-		Servers:           openAPI.Servers,
-	}
-
-	// crafted docs.json
-	buf, err := g.jsonIndent(openAPISpec)
-	if err != nil {
-		return err
-	}
-
-	buffer := &bytes.Buffer{}
-
-	err = generator.Execute(buffer, struct {
-		Timestamp     time.Time
-		Doc           string
-		PackageName   string
-		Title         string
-		Description   string
-		Version       string
-		InstanceName  string
-		GeneratedTime bool
-	}{
-		Timestamp:     time.Now(),
-		GeneratedTime: config.GeneratedTime,
-		Doc:           string(buf),
-		PackageName:   packageName,
-		Title:         openAPI.Info.Spec.Title,
-		Description:   openAPI.Info.Spec.Description,
-		Version:       openAPI.Info.Spec.Version,
-		InstanceName:  config.InstanceName,
-	})
-	if err != nil {
-		return err
-	}
-
-	code := g.formatSource(buffer.Bytes())
-
-	// write
-	_, err = output.Write(code)
-
-	return err
-}
-
-var packageTemplateV3 = `// Code generated by swaggo/swag{{ if .GeneratedTime }} at {{ .Timestamp }}{{ end }}. DO NOT EDIT
-
-package docs
-
-import "github.com/swaggo/swag"
-
-const docTemplate{{ if ne .InstanceName "swagger" }}{{ .InstanceName }} {{- end }} = ` + "`{{ printDoc .Doc}}`" + `
-
-// SwaggerInfo{{ if ne .InstanceName "swagger" }}{{ .InstanceName }} {{- end }} holds exported Swagger Info so clients can modify it
-var SwaggerInfo{{ if ne .InstanceName "swagger" }}{{ .InstanceName }} {{- end }} = &swag.Spec{
-	Version:     {{ printf "%q" .Version}},
-	Title:       {{ printf "%q" .Title}},
-	Description: {{ printf "%q" .Description}},
-	InfoInstanceName: {{ printf "%q" .InstanceName }},
-	SwaggerTemplate: docTemplate{{ if ne .InstanceName "swagger" }}{{ .InstanceName }} {{- end }},
-}
-
-func init() {
-	swag.Register(SwaggerInfo{{ if ne .InstanceName "swagger" }}{{ .InstanceName }} {{- end }}.InstanceName(), SwaggerInfo{{ if ne .InstanceName "swagger" }}{{ .InstanceName }} {{- end }})
-}
-`