The purposes of this research were; 1) to development of line chatbot with problem–based learning in basic html for undergraduate student of Nakhon Pathom Rajabhat.,2) to evaluate the quality of development of line chatbot with problem–based learning in basic html for undergraduate student of Nakhon Pathom Rajabhat. The sample group used in this research was 5 experts in content and production technique using purposive sampling method. The research tools include 1) line chatbot with problem–based learning in basic html 2) content and chatbot production technique evaluation form. The results of the research were as follows; the development of line chatbot with problem–based learning in basic html consisted of 3 units the content and chatbot production technique quality was at a very good level ( = 4.80, S.D. = 0.11)