The Apiaceae species Foeniculum vulgare exists as a well-established therapeutic plant which people frequently use to treat digestive problems, promote milk production, aid as a carminative and acts as a diuretic and respiratory treatment. This study employed gas-chromatography mass spectrometry (GC–MS) method to identify different phytoconstituents present in Foeniculum vulgare methanolic extract. Standards-based analysis according to FT-IR scans the molecular bond interactions of both polymers and all other types of compounds with IR light. The analytical method detected specific absorption bands which existed in organic molecules. Management of bioactive compounds in Foeniculum vulgare was confirmed by the study at different spectral ranges after FT-IR analysis. Fourier-transform infrared spectroscopic profile solid analysis of Fennel (Foeniculum vulgare) Peak (Wave number cm-ˡ), Intensity, Corr. Intensity, Area, Corr. Area, Bond, Functional group assignment (669.30, 59.416, 3.865, 2.859, 0.176, C-Cl and alkyl halides), (684.73, 63.115, 0.860, 2.285, 0.038, C-Cl, and alkyl halides). (827.46, 74.505, 1.152, 2.387, 0.081, =C–H and Alkenes), (873.75, 72.300, 2.593, 2.555, 0.131, =C–H and Alkenes), (927.76, 69.360, 0.661, 4.511, 0.180, =C–H and Alkenes), (1010.70, 48.730, 0.709, 18.575, 0.677, C-F and alkyl halides), (1236.37, 79.328, 0.352, 2.182, 0.052, C-F and alkyl halides), (1313.52, 79.285, 1.798, 2.296, 0.008, C-F and alkyl halides), (1417.68, 73.681, 0.430, 2.204, 0.073, C=C and Aromatic), (1604.77, 77.448, 9.752, 2.817, 0.060, N-H and Amide), (2918.30, 81.850, 1.636, 2.468, 0.286, C-H and Alkane), (3269.34, 74.844, 0.747, 2.381, 0.034, N-H and Amide). GC-MS detected bioactive compounds 2-Hydroxytetrahydropyran, Pentan-2-One, 3-Carene, Acetic acid-1-13C, L-Fenchone, 2-Aminobicyclohexyl, 1-Methyl-2-methylene-4-isopropyl, L-histidine, (-)-Sabinene, 2-Methyl-1-undecanol, 2-Methyl-1-undecanol, (E)-Anethole, 4-Pentyloxy-2,3-dicyanophenyl, Pentane, 1,2-epoxy-2-methyl, 1,3,8-P-menthatriene, 16-Methylheptadecan-1-ol, Methyl oxophenylacetate, Trans-p-mentha-2,8-dienol, Diphenylmethanone, Fenchyl acetate.