As described earlier, on our home page, we want to show our visitors some weather and currency / foreign exchange data. We will build the mock API using faker in this section. 

Weather API 

const express = require("express");
const router = express.Router();
const faker = require("faker");

function generateWeatherData(city) {
  return {
    coord: { lon: faker.random.number(180), lat: faker.random.number(180) 	},
    temp: faker.random.number({ min: 273, max: 315 }),
    feels_like: faker.random.number(45),
    temp_min: faker.random.number(273),
    temp_max: faker.random.number(300),
    pressure: faker.random.number(100),
    humidity: faker.random.number(100),
    name: city || faker.address.city(),
  };
}

router.get("/:city", function (req, res, next) {
  res.json(generateWeatherData(req.params.city));
});

module.exports = router;

The currency API

const express = require("express");
const router = express.Router();
const faker = require("faker");


function generateExchangeRateData() {
	return [
	{
		currency: "EURO",
		value: faker.random.number(300),
	},
	{
		currency: "YEN",
		value: faker.random.number(300),
	},
	{
		currency: "DOLLAR",
		value: faker.random.number(300),
	},
	];
}


router.get("/", function (req, res, next) {
	res.json(generateExchangeRateData());
});

module.exports = router;

Import the files into the app.js and hook them up to the router.

const weatherRouter = require("./routes/weather");
const currencyRouter = require("./routes/currency");

 Mapping to the routes

app.use("/api/weather/:city", weatherRouter);
app.use("/api/currency/:local", currencyRouter);