| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2025/2026 | Aberdeen | Scottish Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2025/2026 | Aberdeen | League Cup | 1 | 0 | 0 | 0 | 0 | – |
| 2023/2024 | Bologna | Coppa Italia | 1 | 0 | 0 | 0 | 0 | 6.2 |
| 2022/2023 | AZ Alkmaar | KNVB Beker | 2 | 2 | 0 | 0 | 0 | – |
| 2021/2022 | AZ Alkmaar | KNVB Beker | 2 | 1 | 0 | 0 | 0 | 7.5 |
| 2020/2021 | AZ Alkmaar | KNVB Beker | 1 | 0 | 0 | 0 | 0 | 7.2 |
| 2019/2020 | Elfsborg | Svenska Cupen | 5 | 2 | 0 | 0 | 1 | – |
| 2018/2019 | Elfsborg | Svenska Cupen | 1 | 1 | 0 | 0 | 0 | – |
| 2017/2018 | Elfsborg | Svenska Cupen | 4 | 1 | 0 | 0 | 0 | – |
| Total | 18 | 7 | 0 | 0 | 1 | – | ||
| Fecha | Desde | Hacia | Tipo | |
|---|---|---|---|---|
| - | Utrecht | Bologna | Return from loan | |
| - | Bologna | Utrecht | Loan | |
| - | Aberdeen | Bologna | Return from loan | |
| 09 ene 2025 | Bologna | Aberdeen | Loan | |
| - | Lecce | Bologna | Return from loan | |
| 01 abr 2025 | Bologna | Lecce | Loan | |
| - | AZ Alkmaar | Bologna | Transfer | |
| - | Elfsborg | AZ Alkmaar | Transfer | |
| 01 ene 2017 | Falkenberg | Elfsborg | Transfer |
J. Karlsson career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.