Reverse Geocode JS [ES7] Gist - Latitude/Longitude to local address.

index.js

/**
 * Created by M on 15/04/17. With ❤
 */

/* 
* Reverse Geocode JS [ES7] Gist. Converts latitude/longitude to a human readable address.
* Firstly, tries to judge whether the lat/long is over a road. If so, returns the local street address
* with state and country stripped out.
* If not, returns the local address for the nearest point of interest. (or place). The second condition works even if   
* the lat/long belongs to a disputed territory such as Kashmir, India.
* It uses Google's Geocode Web API and Places Web API.
* Calls are done over REST using axios.
* Transpile to ES5 by - 
* $ babel index.js --out-file=output.js --presets=env --plugins=transform-runtime
*/ 

import axios from 'axios';

// Get your API key from here - https://developers.google.com/maps/documentation/javascript/get-api-key
const API_KEY = 'YOUR_MAPS_API_KEY_HERE';

export async function reverseGeoCodeAddress(latitude, longitude) {
    try {
        // Google's Geocode API to get address components for a place filtered by location type and result type.
        // For more info - https://developers.google.com/maps/documentation/geocoding/intro#ReverseGeocoding
        const response = await axios.get(`https://maps.googleapis.com/maps/api/geocode/json?latlng=${latitude},${longitude}&key=${API_KEY}&result_type=premise|natural_feature|park|route|intersection|street_number|street_address|airport|sublocality_level_5|sublocality_level_4|sublocality_level_3|sublocality_level_2|sublocality_level_1&location_type=GEOMETRIC_CENTER|RANGE_INTERPOLATED`);
        const serialized = response.data;
        // If the lat/long is indeed over a street or a road. This would say 'OK'.
        if (serialized.status === 'OK') {
            const results = serialized.results[0].address_components;
            const addressString = results.reduce((acc, address) => {
                const addressType = address.types.join('|');
                if (addressType.includes('natural_feature')
                    || addressType.includes('park')
                    || addressType.includes('route')
                    || addressType.includes('neighborhood')
                    || addressType.includes('intersection')
                    || addressType.includes('street_address')
                    || addressType.includes('street_number')
                    || addressType.includes('airport')
                    || addressType.includes('sublocality')) {
                    return acc ? `${acc}, ${address.long_name}` : `${address.long_name}`;
                }
                return acc;
            }, '');
            return addressString;
        } else if (serialized.status === 'ZERO_RESULTS') {
            // If otherwise, fetch the nearest place and its details using Google's Places API.
            // For more info - https://developers.google.com/places/web-service/search
            const addressString = await resolveAddressFromPlacesAPI(latitude, longitude);
            return addressString || 'Address Not Available';
        } else {
            throw new Error(serialized.status);
        }
    } catch (ex) {
        throw new Error(ex);
    }
}

async function resolveAddressFromPlacesAPI(latitude, longitude) {
    try {
        const response = await axios.get(`https://maps.googleapis.com/maps/api/place/nearbysearch/json?key=${API_KEY}&location=${latitude},${longitude}&rankby=distance`);
        const serialized = response.data;
        if (serialized.status === 'OK') {
            if (serialized.results.length > 1) {
                const { name, vicinity } = serialized.results[0];
                return `${name} ${vicinity}`;
            } else {
                return null;
            }
        } else {
            throw new Error(serialized.status);
        }
    } catch (ex) {
        throw new Error(ex);
    }
}

// Street Address.
// reverseGeoCodeAddress(14.608614226179533,120.99334727972746)
// => 814-817, Earnshaw Street, Sampaloc

// Place Address.
// reverseGeoCodeAddress(14.619009268584021, 120.98432499915361)
// => Cecilio Apostol Elementary School F Yuseco St, Santa Cruz, Manila

reverseGeoCodeAddress(14.619009268584021, 120.98432499915361)
    .then(address => {
        console.log(address);
    })
    .catch(err => {
        console.log(err);
    });