{
    "job_id": ,
    "job_parameters": {
        "params1": "",
        "params2": ""
    }
}

Yes my bad maybe, but it is correctly formatted, and im using POST exactly as described in the databricks rest api documentation. I even copied their example json but that didn't help. I just know that, i can run the job using api, but as soon as i add parameters inside "job_parameters" i get this in return. But I will look into it today!