### Using the API Explorer
Follow these steps to explore the sample app's REST API:
1. Open your browser to http://localhost:3000/explorer. You'll see a list of REST API endpoints as illustrated below.
The endpoints are grouped by the model names. Each endpoint consists of a list
of operations for the model.
2. Click on one of the endpoint paths (such as /locations) to see available
operations for a given model. You'll see the CRUD operations mapped to HTTP verbs and paths.
3. Click on a given operation to see the signature; for example, GET `/locations/{id}`:
Notice that each operation has the HTTP verb, path, description, response model, and a list of request parameters.
4. Invoke an operation: fill in the parameters, then click the **Try it out!** button. You'll see something like this:
You can see the request URL, the JSON in the response body, and the HTTP response code and headers.
Next Steps
To gain a deeper understanding of LoopBack and how it works, read the following sections, [Working with Models](#working-with-models) and [Working with Data Sources and Connectors](#working-with-data-sources-and-connectors).
For information on how StrongLoop Suite provides:
- Out-of-the-box scalability, see
[StrongNode](http://docs.strongloop.com/strongnode#quick-start).
- CPU profiling and path trace features, see
[StrongOps](http://docs.strongloop.com/strongops#quick-start).
- Mobile client APIs, see [LoopBack Client SDKs](http://docs.strongloop.com/loopback-clients/).