Here is a simple hello world API. Why isn't it working?

You don't have to add a slash before app.api.buildURL - that will generate a double slash which might not work in some browsers.

Eg: Change app.api.buildURL('/Hello/World/1') to app.api.buildURL('Hello/World/1')

The first thing that I noticed is that: The success/failure function is outside of app.api.call. It has to be passed as the last argument so that it can be used as a callback.

ie:

app.api.call('GET', app.api.buildURL('/Hello/World/1'), null),
{
    success: function(data){
        if(this.disposed){
            return;
        }
        console.log(data);
    },
    error: function (e) {
        console.log('error');
        console.log(e);
   }
}

Should be changed to:

app.api.call('GET', app.api.buildURL('/Hello/World/1'), null,
{
    success: function(data){
        if(this.disposed){
            return;
        }
        console.log(data);
    },
    error: function (e) {
        console.log('error');
        console.log(e);
   }
});

This should fix your callbacks. The API definition looks correct.

Thank you both!!! It works now.

8764.HelloWorldAPI.zip

Is there a good tutorial to look at what the api is returning using postman?

Thank you both!!! It works now.

8764.HelloWorldAPI.zip

Is there a good tutorial to look at what the api is returning using postman?

I always refer to this tutorial which has a Postman cookbook which can be used to get/set access tokens:

sugarclub.sugarcrm.com/.../sugarcrm-cookbook---the-school-of-rest---part-1