Deep learning models have been sucessfully applied to various areas including computer vision, natural language processing, etc. Little work has been done in the context of program synthesis, code completion in particular. In this work, we provide benchmark results for code completion on the Abstract Syntax Tree(AST) of JavaScripts code collected from Github. We have show the basic LSTM variants could achive 79% top 1 accuracy and 85.6% top 5 accuracy which is comparable to the probablistic model using much domain knowledge. We further evaluate the speed at serving phase, each query takes 33ms running on 16 core CPU and 16ms with one K80 GPU.