The song peaked at number 90 on the Billboard Hot 100 and achieved modest success on the Mainstream Top 40 and dance club airplay charts.

"Tonight I'm Getting Over You" was written by Jepsen, Lukas Hilbert, Max Martin, Clarence Coffee Jr, Shiloh, and Katerina Loules.

[2] The song is primarily electro house,[3] Jepsen's vocal spans to high note F5 and opens with her singing, "I wanna smash your fears and get drunken off your tears / Don't you share your smile with anyone else but me".

[5] As she closes the pre-chorus singing, "No more crying to get me through / I'll keep dancing till the morning with somebody new", the instrumentation incorporates a LMFAO-style beat as we hear Jepsen repetitively chanting, "Tonight I'm getting over you".

[9] Billboard Sam Lansky of Idolator praised the chorus, where he noted the song's transformation from "a 'Give Your Heart A Break'-esque Top 40 lollipop into a noisy, crunchy rave-a-thon.

[11] A negative review came from Carolline Sullivan of The Guardian, who wrote that "set against Dallas Austin and Max Martin's overprocessed beats, [the singer] can't help but fail, as Canadian Idol would put it, to 'own' the songs.

"[12] Candy wrote that while the theme of Jepsen's new single changed with "Tonight I'm Getting Over You", the upbeat tempo remains, making the track a bona fide party anthem.

[5] Commenting on the Nicki Minaj remix, Jeff Benjamin of Fuse said that while the rapper's addition was silly, it had the potential to rescue Jepsen from becoming a one-hit wonder.