| Temporada | Equipo | Competición | PJ | G | A | Nota | ||
|---|---|---|---|---|---|---|---|---|
| 2026 | Vasteras SK | Allsvenskan | 5 | 0 | 0 | 0 | 0 | 6.8 |
| 2025 | Vasteras SK | Superettan | 3 | 0 | 0 | 0 | 0 | – |
| 2025 | Hammarby | Allsvenskan | 8 | 0 | 0 | 0 | 0 | 6.9 |
| 2024 | Sandviken | Superettan | 11 | 1 | 3 | 3 | 0 | 7.0 |
| 2023 | Stockholm Internazionale | Division 1 - Norra | 29 | 2 | 0 | 4 | 0 | – |
| Total | 56 | 3 | 3 | 7 | 0 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| - | Vasteras SK | Hammarby | Return from loan | |
| - | Hammarby | Vasteras SK | Loan | |
| - | Vasteras SK | Hammarby | Return from loan | |
| - | Hammarby | Vasteras SK | Loan | |
| - | Sandviken | Hammarby | Transfer | |
| 02 ene 2024 | Stockholm Internazionale | Sandviken | Transfer | |
| 02 ene 2023 | Djurgarden | Stockholm Internazionale | Free agent |
J. Karlsson career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.