 "One Love" is a R & B song, with a length of three minutes and fifty-four seconds (3: 54). It was written by Lopez, along with A-Plus (Anesha Birchett and Antea Shelton) and the song's producer Emile "D'Mile" Dernst II. A-Plus (Birchett and Shelton) and D 'Mile wrote and presented the song to Lopez, who loved the idea of it, but thought the track to be "very generic". In response, she asked: "Why don't we make it more 'me'?". Lopez then sat with them and wrote new verses for the song, going through every major relationship she had, asking the question: "is there one love?". Lopez described the song as being about "if we can ever have one true soul mate". She recorded her vocals for the song with Kuk Harrell at Record Plant Recording Studios, with additional vocal production from Josh Gudwin, Jim Annunziato and Birchett. John Kercy was responsible for Lopez's vocal editing on "One Love", which was later mixed by Mike "Handz" Donaldson at Chalice Recording Studios.
