Static Repository Example

FaasPlus allows you to easily serve static data and apply filters or transformations as needed. This approach is especially useful when you need to expose a simple dataset through a service. Let’s look at how to create a static repository of cities organized by country.


Run in postman 
const handleRequest = async () => {
    const cities = {
        "United States": [
            "New York City",
            "Los Angeles",
            "Chicago",
            "Houston",
            "Miami"
        ],
        "United Kingdom": [
            "London",
            "Manchester",
            "Birmingham",
            "Glasgow",
            "Edinburgh"
        ],
        "France": [
            "Paris",
            "Lyon",
            "Marseille",
            "Toulouse",
            "Nice"
        ],
        "Germany": [
            "Berlin",
            "Munich",
            "Hamburg",
            "Frankfurt",
            "Cologne"
        ],
        "Japan": [
            "Tokyo",
            "Osaka",
            "Kyoto",
            "Yokohama",
            "Fukuoka"
        ]
    };
    return cities;
};
:response
{
    "France": [
        "Paris",
        "Lyon",
        "Marseille",
        "Toulouse",
        "Nice"
    ],
    "Germany": [
        "Berlin",
        "Munich",
        "Hamburg",
        "Frankfurt",
        "Cologne"
    ],
    "Japan": [
        "Tokyo",
        "Osaka",
        "Kyoto",
        "Yokohama",
        "Fukuoka"
    ],
    "United Kingdom": [
        "London",
        "Manchester",
        "Birmingham",
        "Glasgow",
        "Edinburgh"
    ],
    "United States": [
        "New York City",
        "Los Angeles",
        "Chicago",
        "Houston",
        "Miami"
    ]
}

In this example, the service returns a static set of cities organized by country. You can use this service to retrieve and display city information without a dynamic data source.


To extend this service, let’s add filtering based on user input, such as returning cities only from a specific country.


Filtering Example

Here, we’ll modify the service to return cities only for a specified country, using a filter parameter.


Run in postman 
const handleRequest = async (req) => {
    const cities = {
        "United States": [
            "New York City",
            "Los Angeles",
            "Chicago",
            "Houston",
            "Miami"
        ],
        "United Kingdom": [
            "London",
            "Manchester",
            "Birmingham",
            "Glasgow",
            "Edinburgh"
        ],
        "France": [
            "Paris",
            "Lyon",
            "Marseille",
            "Toulouse",
            "Nice"
        ],
        "Germany": [
            "Berlin",
            "Munich",
            "Hamburg",
            "Frankfurt",
            "Cologne"
        ],
        "Japan": [
            "Tokyo",
            "Osaka",
            "Kyoto",
            "Yokohama",
            "Fukuoka"
        ]
    };

    const filteredCities=cities[req.params.country];
    return filteredCities;
};
:response
[
    "Paris",
    "Lyon",
    "Marseille",
    "Toulouse",
    "Nice"
]

With this extension, the service now accepts a country parameter to filter and return cities from that country. You can further build on this example to add advanced filtering or transformation logic. Note that the req object is essential for retrieving parameters for filtering, as it provides the necessary information based on the request method.