I'd like to grab the sensor value, selected by channelid in json format:

api/table.xml?content=values&output=xml&columns=datetime,value_,coverage&id=123456&noraw=1&usecaption=true&count=10

returns the values of the channelids separately. I'd like to have this result in json format

api/table.xml?content=values&output=json&columns=datetime,value_,coverage&id=123456&noraw=1&usecaption=true&count=10

won't return the channel id (which i would like to filter by, I Don't want to filter the Json by Channel Caption but by ID)

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Is this the API call you're looking for?

/api/table.json?content=channels&output=json&columns=objid,name,lastvalue_&id=12456

The output will look like this:

{
   "prtg-version":"17.3.32.2478",
   "treesize":0,
   "channels":[
      {
         "objid":-4,
         "objid_raw":"*000000004",
         "name":"Downtime",
         "lastvalue":""
      },
      {
         "objid":0,
         "objid_raw":0,
         "name":"Available Services",
         "lastvalue":"100 %",
         "lastvalue_raw":100.0000
      },
      {
         "objid":2,
         "objid_raw":2,
         "name":"Office 365",
         "lastvalue":"140 msec",
         "lastvalue_raw":140.0000
      },
      {
         "objid":10,
         "objid_raw":10,
         "name":"Youtube",
         "lastvalue":"43 msec",
         "lastvalue_raw":43.0000
      }
   ]
}

Jul, 2017 - Permalink