Development Javascript API Security Tools Web performance Software Engineering HTML Dev journal 2021 2021 2020 2020/12 2020/10 2020/09 Articles 2021 2021/04 2021/03 2021/02 2021/01 2020 2020/12 2020/11 2020/10 2020/09 Activities 2021 2021/Q2 VS code extensions