Why i have this error :: _jsonparsefailure

[yaser]

i send string like this message filed from rabbitmq to logstash but i cant parse my json to my mapping!

"message": "{DeviceID :2155CA",
"tags": [
"_jsonparsefailure"
]
},

[alexus]

probably due to input isn't valid JSON

[yaser]

finally i found it ,
the problem was from send data from callback to rabbitmq and logstash can discover
the rabbitmq payload must be like this zero string :

{\"Data\" : \"{data}\"}