.js

    const fetch = require("node-fetch");
    exports.dest = async (event, context, callback) => {
        return callExternalApi(event.pathParameters.latitude, event.pathParameters.longitude);
    }
    
    var callExternalApi = async function (latitude, longitude) {
        var appCode = process.env.DEST_APP_CODE
        var apiUrl = process.env.DEST_URL
        var apiId = process.env.DEST_APP_ID
    
        try {
            var response = await fetch(`${apiUrl}?product=observation&latitude=${latitude}&longitude=${longitude}&app_id=${apiId}&app_code=${appCode}`);
            var json = await response.json();
    
            var body = { temperature: json.observations.location[0].observation[0].temperature }
    
            var response = {
                statusCode: 200,
                headers: {
                    "Content-Type": "application/json"
                },
                body: JSON.stringify(body)
            };
            return response;
        } catch (error) {
            console.log(error);
        }
    }