setInterval only output message once if changed

[ErraticFox]

Hello, I am checking a JSON every x seconds to see if a specific thing has changed in it. This change will determine if a specific someone on twitch.tv has gone live. Once they do go live, it’ll output a console log saying they’ve went live and when they go offline.

Currently, it repeats the live or offline message. I need it to only output the status message once. How do I do this? This is my current code.

var twitch = 'https://api.twitch.tv/kraken/streams/mattypocket';

    var online = false

    setInterval(function() {
      checkStream(twitch, function(data) {
        data = JSON.parse(data)
        if (data.stream && !online) {
          online = true
          console.log(`Mattypocket is online, playing ${data.stream.channel.game}. http://twitch.tv/mattypocket`)
        } else {
          online = false
          console.log("offline");
        }
      });
    }, 1000);

    function checkStream(url, callback) {
      request(url, function(err, response, body) {
        if (!err && response.statusCode == 200) {
          if (callback && typeof callback === "function") {
            callback(body);
          }
        }
      })
    }

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