diff --git a/d2js/d2wasm/functions.go b/d2js/d2wasm/functions.go
index 10706fb750..25250880f0 100644
--- a/d2js/d2wasm/functions.go
+++ b/d2js/d2wasm/functions.go
@@ -159,3 +159,37 @@ func Decode(args []js.Value) (interface{}, error) {
 func GetVersion(args []js.Value) (interface{}, error) {
 	return version.Version, nil
 }
+
+func GetCompletions(args []js.Value) (interface{}, error) {
+	if len(args) < 3 {
+		return nil, &WASMError{Message: "missing required arguments", Code: 400}
+	}
+
+	text := args[0].String()
+	line := args[1].Int()
+	column := args[2].Int()
+
+	completions, err := d2lsp.GetCompletionItems(text, line, column)
+	if err != nil {
+		return nil, &WASMError{Message: err.Error(), Code: 500}
+	}
+
+	// Convert to map for JSON serialization
+	items := make([]map[string]interface{}, len(completions))
+	for i, completion := range completions {
+		items[i] = map[string]interface{}{
+			"label":      completion.Label,
+			"kind":       int(completion.Kind),
+			"detail":     completion.Detail,
+			"insertText": completion.InsertText,
+		}
+	}
+
+	return CompletionResponse{
+		Items: items,
+	}, nil
+}
+
+type CompletionResponse struct {
+	Items []map[string]interface{} `json:"items"`
+}
diff --git a/d2js/js.go b/d2js/js.go
index c1461b5df8..50280194c6 100644
--- a/d2js/js.go
+++ b/d2js/js.go
@@ -11,6 +11,7 @@ import (
 func main() {
 	api := d2wasm.NewD2API()
 
+	api.Register("getCompletions", d2wasm.GetCompletions)
 	api.Register("getParentID", d2wasm.GetParentID)
 	api.Register("getObjOrder", d2wasm.GetObjOrder)
 	api.Register("getRefRanges", d2wasm.GetRefRanges)