buy.js

//you will need to install node.js and restler first
//npm install restler

//run with the following command
// node buy.js

var sys = require('util'),
    rest = require('restler');

//set these to your coinbase API key, the amount you want to buy & the price that you're expecting for
var apiKey = 'xxx';
var quantity = 10;
var expectedPrice = 44.00

var jsonData = { qty: quantity };

function onComplete(data, res) {
  console.log(new Date().toString());
  if (!data.success) {
    console.log(data.errors);
    setTimeout(buy, 5000);
  } else {
    console.log("SUCCESS!");
  }

};

function buy() {
  // Will check the price until it reaches the expected value
  rest.get('https://coinbase.com/api/v1/prices/buy').on('complete', function(data){
    console.log("Current price: "+data.amount+". Expected price: "+expectedPrice)
    
    if(data.amount <= expectedPrice){
      rest.postJson('https://coinbase.com/api/v1/buys?api_key=' + apiKey, jsonData).on('complete', onComplete);
    }else{
      setTimeout(buy, 60000)
    }

    return
  });

}

buy();

You're missing an ending semicolon on line 13 and line 36.