How to collect Zabbix data using API ?

[kreazy]

Hi. I am a fresher developer and start using Zabbix.
Now i want to collect some data like 0.26% in this graph like that. So what method and params i need to use? i try to using graph.get and item.get but nothing appear. Thankyou
The json request i use like that:

{
"jsonrpc": "2.0",

"method": "item.get",

"params": {

"hostids":10084,
"graphid":910

},

"id": 1,

"auth": "xxx"

}