The code behind https://addresstocoordinates.joe.workers.dev/?q=87714 (An API for converting from a municipality or zip code to latitude/longitude coordinates)

index.js

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})

function getUrlVars(url) {
    var vars = {};
    var parts = url.replace(/[?&]+([^=&]+)=([^&]*)/gi, function(m,key,value) {
        vars[key] = value;
    });
    return vars;
}

async function handleRequest(request) {
    // What are they searching for?
    if(typeof getUrlVars(request.url)["q"] !== 'undefined'){
        query = getUrlVars(request.url)["q"];
    }
    else{
        // If they aren't passing anything in, don't give them anything back
        return new Response(JSON.stringify(null, null, 2), {
        headers: {
            "content-type": "application/json;charset=UTF-8",
            "Access-Control-Allow-Origin": "*",
            "Access-Control-Allow-Methods": "GET",
            "Access-Control-Max-Age": "86400",
        }
    })
    }

    let endpoint = null;

    // Are they looking for a ZIP Code?
    if(!isNaN(parseFloat(query))){
        // API Crap
        endpoint = "https://gist.githubusercontent.com/steinbring/17b4652c6b9283b28eb3e2c2320f8cc2/raw/796f8eacdf6eb33010683e328fb51e734262ed6a/zipCodeToLatLong.json";
    }else{
    // Are they looking for a city/village/town?
        // API Crap
        endpoint = "https://gist.githubusercontent.com/steinbring/b9dc9d2a47acfe4fcf2613d6d0b1154b/raw/af0d309ed7f11a58db3e043fd013f9318893a1f7/cityStateToLatLong.json";
    }

    // API Crap
    const init = {
        headers: {
        "content-type": "application/json;charset=UTF-8",
        },
    }

    const response = await fetch(endpoint,init);
    const result = await response.json();

    // Do a keyword search of either the zip codes or the municipalities, depending on what they are looking for
    let locations = null;
    // Are they looking for a ZIP Code?
    if(!isNaN(parseFloat(query))){
        // API Crap
        locations = result.filter(location => location.zip.toString().startsWith(query));
    }else{
    // Are they looking for a city/village/town?
        // API Crap
        locations = result.filter(location => location.city.startsWith(query));
    }

    return new Response(JSON.stringify(locations, null, 2), {
        headers: {
            "content-type": "application/json;charset=UTF-8",
            "Access-Control-Allow-Origin": "*",
            "Access-Control-Allow-Methods": "GET",
            "Access-Control-Max-Age": "86400",
        }
    })
}