JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.2.1.min.js"></script>

JavaScript

$(document).ready(function(){
var details={  
   "coord":{  
      "lon":145.77,
      "lat":-16.92
   },
   "weather":[  
      {  
         "id":803,
         "main":"Clouds",
         "description":"broken clouds",
         "icon":"04n"
      }
   ],
   "base":"cmc stations",
   "main":{  
      "temp":293.25,
      "pressure":1019,
      "humidity":83,
      "temp_min":289.82,
      "temp_max":295.37
   },
   "wind":{  
      "speed":5.1,
      "deg":150
   },
   "clouds":{  
      "all":75
   },
   "rain":{  
      "3h":3
   },
   "dt":1435658272,
   "sys":{  
      "type":1,
      "id":8166,
      "message":0.0166,
      "country":"AU",
      "sunrise":1435610796,
      "sunset":1435650870
   },
   "id":2172797,
   "name":"Cairns",
   "cod":200
};
alert(details.weather[0].main.toLowerCase()=="clouds");
});