csv_to_geojson.csv

csv_to_geojson.js

var mapnik = require('mapnik');
mapnik.register_default_input_plugins();

var source = new mapnik.Datasource({
  type: 'csv', file: './csv_to_geojson.csv'
});
// get meta-information about this datasource
console.log(source.describe());

// convert this CSV file into GeoJSON
var featureset = source.featureset();
var featureCollection = { type: 'FeatureCollection', features: [] }, feature;
while (feature = featureset.next()) {
  featureCollection.features.push(JSON.parse(feature.toJSON()));
}
console.log(JSON.stringify(featureCollection, null, 2));

package.json

{
  "name": "mapnik-second-act",
  "version": "1.0.0",
  "description": "demos of useful mapnik functionality",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [
    "mapnik",
    "demos"
  ],
  "author": "Tom MacWright",
  "license": "ISC",
  "dependencies": {
    "mapnik": "^3.4.3"
  }
}