const fs = require('fs') const countyMap = require('./ga-13-georgia-counties.raw.json') countyMap.objects.collection.geometries.forEach(county => { const id = county.properties.NAME.toLowerCase().split(' ').join('-') county.properties.name = county.properties.NAME county.properties.id = id delete county.properties.NAME county.id = `ga-13-georgia-counties.${id}` }) fs.writeFileSync('./ga-13-georgia-counties.json', JSON.stringify(countyMap, null, ' '))