Former Sunderland and West Brom forward Josh Maja gave the winless hosts an 18th-minute lead but right-back Hakimi set up Mika Godts to level before putting his team in front with a smart finish two minutes later.
The PSG captain, who had not scored this season ahead of kick-off, curled home a 20-yard free-kick early in the second half before Senny Mayulu added a fourth. Hakimi completed his treble in the 69th minute with a fortunate rebound.
PSG's victory was their ninth in a row in all competitions – and sixth successive league win – after they picked up just a point from their opening three fixtures.
Veteran striker Olivier Giroud scored a late winner as Lille beat Lens 1-0 in the Derby du Nord to move up to second.
The 40-year-old substitute struck his third goal of the season in the 86th minute to keep Lille two points behind PSG.
Third-placed Rennes fell four points behind the leaders after Elye Wahi scored a hat-trick to inspire Nice to a 5-2 victory.
In the Bundesliga, Elversberg continued their impressive start following promotion by thrashing Mainz 4-1 to climb to fifth.
Felix Keidel, Francis Onyeka, Maurice Krattenmacher and substitute Cole Campbell scored for the hosts. Benedict Hollerbach grabbed a late consolation for Mainz before teammate Stefan Posch was sent off for a second booking.
Espanyol ended a run of five La Liga games without a win by beating Villarreal 1-0 thanks to Leandro Cabrera's 60th-minute goal.
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