diff --git a/internal/bun/plan.go b/internal/bun/plan.go
index 6364831f..c0b8b622 100644
--- a/internal/bun/plan.go
+++ b/internal/bun/plan.go
@@ -1,14 +1,59 @@
 package bun
 
 import (
+	"log"
+
+	"github.com/moznion/go-optional"
+	"github.com/spf13/afero"
 	"github.com/zeabur/zbpack/internal/nodejs"
 	"github.com/zeabur/zbpack/pkg/types"
 )
 
+type bunPlanContext struct {
+	PackageJSON nodejs.PackageJSON
+	Src         afero.Fs
+
+	Framework optional.Option[types.BunFramework]
+}
+
 // GetMetaOptions is the options for GetMeta.
 type GetMetaOptions nodejs.GetMetaOptions
 
 // GetMeta gets the metadata of the Node.js project.
 func GetMeta(opt GetMetaOptions) types.PlanMeta {
-	return nodejs.GetMeta(nodejs.GetMetaOptions(opt))
+	packageJSON, err := nodejs.DeserializePackageJSON(opt.Src)
+	if err != nil {
+		log.Printf("Failed to read package.json: %v", err)
+		// not fatal
+	}
+
+	ctx := &bunPlanContext{
+		PackageJSON: packageJSON,
+		Src:         opt.Src,
+	}
+
+	meta := nodejs.GetMeta(nodejs.GetMetaOptions(opt))
+
+	framework := DetermineFramework(ctx)
+	meta["framework"] = string(framework)
+
+	return meta
+}
+
+// DetermineFramework determines the framework of the Bun project.
+func DetermineFramework(ctx *bunPlanContext) types.BunFramework {
+	fw := &ctx.Framework
+	packageJSON := ctx.PackageJSON
+
+	if framework, err := fw.Take(); err == nil {
+		return framework
+	}
+
+	if _, isElysia := packageJSON.Dependencies["elysia"]; isElysia {
+		*fw = optional.Some(types.BunFrameworkElysia)
+		return fw.Unwrap()
+	}
+
+	*fw = optional.Some(types.BunFrameworkNone)
+	return fw.Unwrap()
 }
diff --git a/pkg/types/plan.go b/pkg/types/plan.go
index ad386523..118e59e6 100644
--- a/pkg/types/plan.go
+++ b/pkg/types/plan.go
@@ -188,3 +188,12 @@ const (
 )
 
 //revive:enable:exported
+
+// BunFramework represents the framework of a Bun project.
+type BunFramework string
+
+//revive:enable:exported
+const (
+	BunFrameworkElysia BunFramework = "elysia"
+	BunFrameworkNone   BunFramework = "none"
+)