nodejs JSON parsing.issue

Question

我正在尝试解析JSON以获得特定的行。我已经在谷歌上尝试了很多我能找到的不同的东西，这是我能找到的最接近的东西。

我想要读的是：

[{
    "id": "pinkcoin", 
    "name": "PinkCoin", 
    "symbol": "PINK", 
    "rank": "321", 
    "price_usd": "0.0281999", 
    "price_btc": "0.00000165", 
    "24h_volume_usd": "195433.0", 
    "market_cap_usd": "10470475.0", 
    "available_supply": "371294750.0", 
    "total_supply": "388294750.0", 
    "max_supply": null, 
    "percent_change_1h": "5.48", 
    "percent_change_24h": "10.83", 
    "percent_change_7d": "-7.62", 
    "last_updated": "1513043947"
}]

我正在试着把"price_usd“部分从这里拉出来……下面是我使用的代码：

var request = require('request');
request('https://api.coinmarketcap.com/v1/ticker/pinkcoin/', function (error, response, body) {
  fs.readFile(body, 'utf8', function (err, data) {
    if (err) {
      console.log('Error: ' + err);
      return;
    }

    data = JSON.parse(data);

    bot.sendMessage({
      to: channelID,
      message: data.price_usd
    });
  });
});

但是当我触发这段代码时，我在控制台中得到了这样的结果：

Error: Error: ENAMETOOLONG: name too long, open '[{
    "id": "pinkcoin",
    "name": "PinkCoin",
    "symbol": "PINK",
    "rank": "319",
    "price_usd": "0.0284066",
    "price_btc": "0.00000166",
    "24h_volume_usd": "195093.0",
    "market_cap_usd": "10547221.0",
    "available_supply": "371294750.0",
    "total_supply": "388294750.0",
    "max_supply": null,
    "percent_change_1h": "6.15",
    "percent_change_24h": "11.55",
    "percent_change_7d": "-6.97",
    "last_updated": "1513044245"
}]'

我一直在寻找解决这个问题的方法，但是我一无所获。