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JavaScript

var data = '{"1": { "state": "VIC","postcode": "2600,2603,2605,2606"}, "2": {"state": "NSW","postcode": "2259,2264"}}';
var jsObj = {"obd":[{"comments":"Last HeartBeat in 17-Sep-2018 02:41 PDT , packet type 01","dealer_id":"1","hw_type":"obd","mac_id":"00800000040041a9","name":"Sabita","status":"up","tenant_id":"new-innovationmotors"},{"dealer_id":"1","hw_type":"obd","mac_id":"0080000004004189","status":"up","tenant_id":"new-innovationmotors"}],"ops":[{"dealer_id":"1","hw_type":"ops","mac_id":"0008004a43dd","name":"On-Prem Server","status":"up","tenant_id":"new-innovationmotors"}],"ott":[{"dealer_id":"1","device_type":"SVCDESK","hw_type":"ott","mac_id":"800a805ad063","name":"Service Desk","status":"up","tenant_id":"new-innovationmotors"},{"dealer_id":"1","device_type":"SVCDESK","hw_type":"ott","mac_id":"800a805ad711","name":"Service Lane","status":"down","tenant_id":"new-innovationmotors"},{"dealer_id":"1","device_type":"SVCL","hw_type":"ott","mac_id":"800a805ad6cf","name":"Wait Area","status":"up","tenant_id":"new-innovationmotors"}],"rfidReader":[{"dealer_id":"1","hw_type":"rfidReader","last_scan_timestamp":"180725185904","mac_id":"285059a03246","name":"Service Lane 1","status":"up","tenant_id":"new-innovationmotors","version":"1"}]};
var find = "2600";
var values = jsObj.filter(function(x) {
  return jsObj[x].status.indexOf('down') > -1;
}).map(function(x) {
  return jsObj[x].status;
});
console.log(values.length > 0 ? values[0] : "not found");