nextjs incremental static regeneration page that regenerates every 45 seconds. the page should fetch the latest weather for a zip code. in typescript

To achieve this in Next.js, we can use Incremental Static Regeneration (ISR) along with setInterval() function to fetch the latest weather data for a zip code every 45 seconds.

Here's an example implementation in TypeScript:

First, we need to create a Weather component that fetches weather data for a given zip code and displays it:

index.ts
import { useState, useEffect } from 'react';

type WeatherData = {
  temperature: number;
  description: string;
};

interface WeatherProps {
  zipCode: string;
}

const Weather: React.FC<WeatherProps> = ({ zipCode }) => {
  const [weather, setWeather] = useState<WeatherData | null>(null);

  useEffect(() => {
    async function fetchWeather() {
      const res = await fetch(
        `https://api.openweathermap.org/data/2.5/weather?zip=${zipCode}&appid=YOUR_API_KEY&units=metric`
      );
      const { main, weather } = await res.json();
      setWeather({
        temperature: main.temp,
        description: weather[0].description,
      });
    }

    fetchWeather();
  }, [zipCode]);

  if (!weather) {
    return <div>Loading...</div>;
  }

  return (
    <div>
      <p>Temperature: {weather.temperature} °C</p>
      <p>Description: {weather.description}</p>
    </div>
  );
};

export default Weather;

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Next, we can create a dynamic page ([zipCode].tsx) that renders the Weather component and uses ISR to regenerate the page every 45 seconds:

index.ts
import { GetStaticProps, GetStaticPaths } from 'next';
import Weather from '../../components/Weather';

type WeatherData = {
  temperature: number;
  description: string;
};

interface WeatherPageProps {
  zipCode: string;
  weather: WeatherData;
}

const WeatherPage: React.FC<WeatherPageProps> = ({ zipCode, weather }) => {
  return (
    <div>
      <h1>Weather for {zipCode}</h1>
      <Weather zipCode={zipCode} />
      <p>Last updated at: {new Date().toLocaleTimeString()}</p>
    </div>
  );
};

export default WeatherPage;

// This function gets called at build time
export const getStaticProps: GetStaticProps<WeatherPageProps> = async ({
  params,
}) => {
  const { zipCode } = params;
  const weather = await fetchWeatherData(zipCode as string);
  // Pass weather data as props
  return { props: { zipCode, weather }, revalidate: 45 };
};

// This function gets called at build time
export const getStaticPaths: GetStaticPaths = async () => {
  // Return a list of possible values for zipCode
  return { paths: [], fallback: 'blocking' };
};

// fetch latest weather data
async function fetchWeatherData(zipCode: string): Promise<WeatherData> {
  const res = await fetch(
    `https://api.openweathermap.org/data/2.5/weather?zip=${zipCode}&appid=YOUR_API_KEY&units=metric`
  );
  const { main, weather } = await res.json();
  return {
    temperature: main.temp,
    description: weather[0].description,
  };
}

// re-fetch latest weather data every 45 seconds
setInterval(() => {
  const zipCodes = ['10001', '90210', '60601']; // example zip codes to fetch data for
  zipCodes.forEach(async (zipCode) => {
    const data = await fetchWeatherData(zipCode);
    // update data in Next.js cache
    await fetch(
      `http://localhost:3000/api/weather/cache/${zipCode}`,
      {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify(data),
      }
    );
  });
}, 45000);

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In the above code, we use getStaticProps() function with revalidate option set to 45 seconds, which tells Next.js to re-generate the page every 45 seconds. We also use setInterval() function to fetch latest weather data for multiple zip codes and update the data in Next.js cache using a custom API route (/api/weather/cache/[zipCode].ts).

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related categories

`nextjs`
`incremental static regeneration`
`weather api`
`setinterval`
`typescript`

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