This study examined the normative legitimisation of diversion and restorative justice within Indonesia's juvenile criminal justice system (SPPA Law) and Islamic criminal law, and explored the implications for strengthening the reform. This study adopted a normative legal approach using statutory and conceptual methods. Primary legal materials included Law No. 11 of 2012 on the SPPA Law, Law No. 1 of 2023 on the Criminal Code, Law No. 1 of 2026 concerning the Adjustment of Criminal Provisions, Supreme Court Regulation No. 1 of 2024, Attorney General Regulation No. 15 of 2020, and Indonesian National Police Regulation No. 8 of 2021, supported by legal doctrines as well as classical and contemporary fiqh jinayah literature. The results showed that diversion possessed dual normative legitimacy, deriving from Indonesia's positive legal framework and Islamic criminal law through the principles of ta'zir, maqāṣid al-syarī'ah, justice (al-'adl), reconciliation (iṣlāḥ), compassion (raḥmah), and public interest (maṣlaḥah). This study proposed a Dual Normative Legitimacy Model that integrated national law and Islamic legal principles as a framework for implementing diversion. The proposed model contributed to juvenile criminal justice reform by strengthening regulatory harmonisation, promoting child protection, enhancing victim restoration, and supporting sustainable social reintegration.
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