[en] The electromagnetic generation spectroscopy experiment of lambda hypernuclei using electron beams was started in 2000 at the Jefferson National Laboratory (JLab) in the United States. Although this project had expectations for a number of advantages compared with traditional techniques using π, k meson beams, there were a mountain of experimental difficulties at the same time. Through the efforts of the past 15 years, the experimental results at JLab of a variety of lambda hypernuclei such as _Λ"7He, _Λ"1"0Be, and _Λ"1"2B have finally been collected. The doctoral thesis that summarizes the latest achievements (GOKAMI Toshiyuki at Tohoku University) recently received the young researcher award of the Nuclear Physics Forum. In addition, at MAMI of Mainz University, the ground state of _Λ"4H hypernuclei has been precisely dispersed using a new experimental technique: decayed π meson spectroscopy of lambda hypernuclei that was generated electromagnetically. This paper comprehensively explains the past and future of the 'Precision spectroscopy of lambda hypernuclei using electron beams' at JLab and MAMI, and reviews the experimental methods and the latest achievements at JLab. (A.O.)