Error Handling with Node.js

Every oncomplete callback function in the GrabzIt Node.js API has as its first parameter, a standard Node.js error object. However in order to enable developers to programmatically handle errors this error object, in addition to having a message property also has a code property that contains a error code that directly maps to a error. How each error code maps to an error is indicated in the below table, this avoids the need to parse error messages.

An example of how to use an error object to determine how to handle an error is shown below.

var grabzit = require('grabzit');

var client = new grabzit("Sign in to view your Application Key", "Sign in to view your Application Secret");
client.url_to_image("http://www.google.com");
client.save_to('images/result.jpg', function(error, result){
    if (error.code == client.ERROR_CODES.PARAMETER_NO_URL)
    {
        //Please enter a URL
    }
});

Error Code Lookup