us-zips/scripts/import-zips.js

A list of US ZIP codes and their geolocations

#!/usr/bin/env node
const fs = require("fs");
const util = require("util");

const args = process.argv.slice(2);

if (args.length !== 1) {
	console.error(
		"Expected one argument, a path to a txt file from the Census Bureau"
	);
	process.exit(1);
}

const filepath = args[0];
const zipList = {};

fs.readFileSync(filepath, {encoding: "utf-8"})
	.replace(/^$/, "")
	.split("\n")
	// Remove the column names from the file
	.slice(1, -1)
	.map((line) => line.split("\t"))
	// Remove unnecessary columns (land/water area), make into Object
	.forEach(([zipCode, _a, _b, _c, _d, latitude, longitude]) => {
		zipList[zipCode] = {
			latitude: parseFloat(latitude),
			longitude: parseFloat(longitude),
		};
	});

const outputBody = `module.exports = ${util.inspect(zipList, {
	compact: 2,
})}\n`;

fs.writeFileSync("./object.js", outputBody);