Slack slackbot send weather forecast

slackWeather.js

var request = require("request");

// The Cities IDs can be found on openweathermap.org (make a search, and look the URI)
var cities = [2988507, 5391959];
var slackBotUri = ""; // TODO: Complete

request("http://api.openweathermap.org/data/2.5/group?id="+cities.join(',')+"&units=metric ", function(error, response, body) {
  // Maybe we can handle this differently/better ?
  if(error != null)
  	return;
  	
  var text = "Hello team, here is the weather forecast for today: \n";

  var weatherForecasts = JSON.parse(body);
 
  for (var i = weatherForecasts.list.length - 1; i >= 0; i--) {
  	var currentCity= weatherForecasts.list[i];

  	text += "*"+currentCity.name+"*: ";
  	text += ":" + currentCity.weather[0].icon + ": ";
  	text += currentCity.weather[0].main + ", " + currentCity.weather[0].description + ". ";
  	text += "Temp: " + currentCity.main.temp + "°c. "
  	text += "\n";
  };

  console.log(text);

  request.post({
        url: slackBotUri,
         body: text
         }, function(error, response, body){
            console.log(body);
    });
});

If you want to display the forecast icons, you must add custom emoji to your slack instance. You can download/see all used icons here : http://openweathermap.org/weather-conditions

How do I implement this in Slack? Do I use webhooks for this?

Ditto... how do you install this in Slack?

He has a variable called slackBotUri. Set that to the URI that you have setup as a webhook integration.

Could someone tell me exactly how to do this?
Download this file, install Node.js, input webhook url into slackBotUri, run with the command: node slackWeather.js, is that right?
If so, it didn't work for me.
module.js:340
throw err;
^
Error: Cannot find module 'request'
at Function.Module._resolveFilename (module.js:338:15)
at Function.Module._load (module.js:280:25)
at Module.require (module.js:364:17)
at require (module.js:380:17)
at Object. (/root/slackWeather.js:1:77)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
at Function.Module._load (module.js:312:12)
at Function.Module.runMain (module.js:497:10)

@thinhduckhoi npm install request