Node.js Geocoding Tutorial

Install nodejs package

$ npm install opencage-api-client
# or using yarn
$ yarn add opencage-api-client

Set API key

Create a .env file with:

OCD_API_KEY=YOUR-API-KEY

Reverse geocode (coordinates to place)

const opencage = require('opencage-api-client');

opencage.geocode({q: '37.4396, -122.1864', language: 'fr'}).then(data => {
  // console.log(JSON.stringify(data));
  if (data.status.code == 200) {
    if (data.results.length > 0) {
      var place = data.results[0];
      console.log(place.formatted);
      console.log(place.components.road);
      console.log(place.annotations.timezone.name);
    }
  } else if (data.status.code == 402) {
    console.log('hit free-trial daily limit');
    console.log('become a customer: https://opencagedata.com/pricing'); 
  } else {
    // other possible response codes:
    // https://opencagedata.com/api#codes
    console.log('error', data.status.message);
  }
}).catch(error => {
  console.log('error', error.message);
});

// ... prints
// 1330 Middle Avenue, Menlo Park, Californie 94025, États-Unis d'Amérique
// Middle Avenue
// America/Los_Angeles

Forward geocode (address to coordinates)

const opencage = require('opencage-api-client');

opencage.geocode({q: 'Theresienhöhe 11, München'}).then(data => {
  console.log(JSON.stringify(data));
  if (data.status.code == 200) {
    if (data.results.length > 0) {
      var place = data.results[0];
      console.log(place.formatted);
      console.log(place.geometry);
      console.log(place.annotations.timezone.name);
    }
  } else if (data.status.code == 402) {
    console.log('hit free-trial daily limit');
    console.log('become a customer: https://opencagedata.com/pricing'); 
  } else {
    // other possible response codes:
    // https://opencagedata.com/api#codes
    console.log('error', data.status.message);
  }
}).catch(error => {
  console.log('error', error.message);
});

// ... prints
// Theresienhöhe 11, 80339 Munich, Germany
// { lat: 48.1341651, lng: 11.5464794 }
// Europe/Berlin

# install with npm or yarn
$ npm install node-geocoder

var NodeGeocoder = require('node-geocoder');
 
var geocoder = NodeGeocoder({
  provider: 'opencage',
  apiKey: 'YOUR-API-KEY'
});

// Using callback
geocoder.geocode('37.4396, -122.1864', function(err, res) {
  console.log(res);
});
geocoder.geocode('29 champs elysée paris', function(err, res) {
  console.log(res);
});

// Or using Promise
geocoder.geocode('37.4396, -122.1864')
.then(function(res) {
  console.log(res);
})
.catch(function(err) {
  console.log(err);
});

geocoder.batchGeocode(['address1', 'address2'], function (err, results) {
  // Return an array of type {error: false, value: []}
  console.log(results) ;
});