[Python] Input should be a valid list

I am trying to filter objects by body parameters. My code:

@app.post("/counters/")
def list_counters(project_names: List[str], db: Session = Depends(get_db)):
""" Get project by name"""
query = db.query(models.Project).filter(models.Project.name.in_(project_names)).all()


return {"message": ""}


My request POST

{
"project_names": ["as"]
}


I see this error:

{
"detail": [
{
"type": "list_type",
"loc": [
"body"
],
"msg": "Input should be a valid list",
"input": {
"project_names": [
"as"
]
}
}
]
}

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