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The products of the electron width of the J/\psi meson and the branchingfraction of its decays to the lepton pairs were measured using data from theKEDR experiment at the VEPP-4M electron-positron collider. The results are  \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-)=(0.3323\pm0.0064\pm0.0048) keV,  \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)=(0.3318\pm0.0052\pm0.0063) keV.  Their combinations  \Gamma_{ee}\times(\Gamma_{ee}+\Gamma_{\mu\mu})/\Gamma=(0.6641\pm0.0082\pm0.0100)keV,  \Gamma_{ee}/\Gamma_{\mu\mu}=1.002\pm0.021\pm0.013 can be used to improvetheaccuracy of the leptonic and full widths and test leptonic universality.Assuming e\mu universality and using the world average value of the leptonbranching fraction, we also determine the leptonic \Gamma_{ll}=5.59\pm0.12 keVand total \Gamma=94.1\pm2.7 keV widths of the J/\psi meson.

Measurement of \Gamma_{ee}(J/\psi)*Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)*Br(J/\psi->\mu^+\mu^-)

Measurement of \Gamma_{ee}(J/\psi)Br(J/\psi->e^+e^-) and \Gamma_{ee}(J/\psi)Br(J/\psi->\mu^+\mu^-)