app.js

var express = require('express');
var fs = require('fs');
var cors = require('cors');
var app = express();
var port = process.env.PORT || 3000;

app.use(cors());

jsonFile = fs.readFileSync(__dirname + '/data.json', 'utf-8');
jsonData = JSON.parse(jsonFile);

app.get('/api/po/:po', (req, res) => {
	var po = req.params.po;
	var result;
	for (let k in jsonData) {
		if (jsonData[k].place_name == po) {
			result = k;
			break;
		}
	}
	if (result == undefined) {
		res.status(400);
		res.send({
			error: 'Not Found'
		});
	} else {
		res.send({ postal_code: result });
	}
});
app.get('/api/:pincode', (req, res) => {
	var pincode = req.params.pincode;
	var result = jsonData[pincode];
	if (result == undefined) {
		res.status(400);
		res.send({
			error: 'Incorrect pincode'
		});
	} else {
		res.send(jsonData[pincode]);
	}
});
app.get('*', (req, res) => {
	res.send(fs.readFileSync('./templates/home.html', 'utf-8'));
});
app.listen(port, () => {
	console.log(`Server listening on port ${port}`);
});