diff --git a/_demo/mkjson/mkjson.go b/_demo/mkjson/mkjson.go
new file mode 100644
index 0000000..f4889b4
--- /dev/null
+++ b/_demo/mkjson/mkjson.go
@@ -0,0 +1,13 @@
+package main
+
+import (
+	"github.com/goplus/cjson"
+	"github.com/goplus/llgo/c"
+)
+
+func main() {
+	mod := cjson.Object()
+	mod.SetItem(c.Str("name"), cjson.String(c.Str("math")))
+	c.Printf(c.Str("%s\n"), mod.CStr())
+	mod.Delete()
+}
diff --git a/cjson.go b/cjson.go
index 3d08175..d3ebf61 100644
--- a/cjson.go
+++ b/cjson.go
@@ -15,3 +15,102 @@
  */
 
 package cjson
+
+import (
+	_ "unsafe"
+
+	"github.com/goplus/llgo/c"
+)
+
+const (
+	LLGoPackage = "link: cjson"
+)
+
+// llgo:type C
+type JSON struct {
+	Unused [0]byte
+}
+
+//go:linkname Null C.cJSON_CreateNull
+func Null() *JSON
+
+//go:linkname True C.cJSON_CreateTrue
+func True() *JSON
+
+//go:linkname False C.cJSON_CreateFalse
+func False() *JSON
+
+//go:linkname Bool C.cJSON_CreateBool
+func Bool(boolean c.Int) *JSON
+
+//go:linkname Number C.cJSON_CreateNumber
+func Number(num float64) *JSON
+
+//go:linkname String C.cJSON_CreateString
+func String(str *c.Char) *JSON
+
+//go:linkname Array C.cJSON_CreateArray
+func Array() *JSON
+
+//go:linkname Object C.cJSON_CreateObject
+func Object() *JSON
+
+// raw json
+//
+//go:linkname Raw C.cJSON_CreateRaw
+func Raw(raw *c.Char) *JSON
+
+// Create a string where valuestring references a string so
+// it will not be freed by Delete
+//
+//go:linkname StringRef C.cJSON_CreateStringReference
+func StringRef(str *c.Char) *JSON
+
+// Create an object that only references it's elements so
+// they will not be freed by Delete
+//
+//go:linkname ObjectRef C.cJSON_CreateObjectReference
+func ObjectRef(child *JSON) *JSON
+
+// Create an array that only references it's elements so
+// they will not be freed by Delete
+//
+//go:linkname ArrayRef C.cJSON_CreateArrayReference
+func ArrayRef(child *JSON) *JSON
+
+// Delete a JSON entity and all subentities.
+//
+// llgo:link (*JSON).Delete C.cJSON_Delete
+func (o *JSON) Delete() {}
+
+// Append item to the specified array.
+//
+// llgo:link (*JSON).Add C.cJSON_AddItemToArray
+func (o *JSON) AddItem(item *JSON) c.Int { return 0 }
+
+// Append item to the specified object.
+//
+// llgo:link (*JSON).Set C.cJSON_AddItemToObject
+func (o *JSON) SetItem(key *c.Char, item *JSON) c.Int { return 0 }
+
+// llgo:link (*JSON).CStr C.cJSON_PrintUnformatted
+func (o *JSON) CStr() *c.Char { return nil }
+
+// Render a JSON entity to text for transfer/storage.
+//
+// llgo:link (*JSON).Print C.cJSON_Print
+func (o *JSON) Print() *c.Char { return nil }
+
+// Render a JSON entity to text for transfer/storage without any formatting.
+//
+// llgo:link (*JSON).PrintUnformatted C.cJSON_PrintUnformatted
+func (o *JSON) PrintUnformatted() *c.Char { return nil }
+
+// Render a JSON entity to text using a buffered strategy.
+//
+// prebuffer is a guess at the final size. guessing well reduces reallocation.
+//
+// fmt=0 gives unformatted, =1 gives formatted.
+//
+// llgo:link (*JSON).PrintBuffered C.cJSON_PrintBuffered
+func (o *JSON) PrintBuffered(prebuffer c.Int, fmt c.Int) *c.Char { return nil }
diff --git a/go.mod b/go.mod
index b6fa2c6..57cd4ea 100644
--- a/go.mod
+++ b/go.mod
@@ -1,3 +1,5 @@
 module github.com/goplus/cjson
 
 go 1.18
+
+require github.com/goplus/llgo v0.8.1
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..9d1325c
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,2 @@
+github.com/goplus/llgo v0.8.1 h1:M02K0unq0Ee/uK5wW1EBPCFJ+LxfQq45kkJawS5maRE=
+github.com/goplus/llgo v0.8.1/go.mod h1:FZVAPoRTpAuQIizMP7wcZYcZ25Ft+GUX6WhD23GcFhc=