I'm trying to learn nextjs. Struggling to work out routing with getServerSideProps.
Using a free API I have a list of countries displayed on the DOM. I want to dynamically link to a country and data be fetched and displayed for that specific country.
Heres my code so far
const Country = props => (
<Layout>
<h1>{props.country.name}</h1>
<span>{props.country.capital}</span>
</Layout>
);
export async function getServerSideProps(context) {
const { id } = context.query;
const res = await fetch(`https://restcountries.eu/rest/v2/name/${id}`);
const country = await res.json();
console.log(`Fetched place: ${country.name}`);
return { props: { country } };
}
export default Country;
<div className='container'>
<Head>
<title>Countries List</title>
<link rel='icon' href='/favicon.ico' />
</Head>
<Layout>
<main>
<h1>
Countries{' '}
<span role='img' aria-label='world emoji'>
🌎
</span>
</h1>
<ul>
{countries.map(country => (
<li key={country.name}>
<Link href='/p/[id]' as={`/p/${country.name}`}>
<a>{country.name}</a>
</Link>
</li>
))}
</ul>
</main>
</Layout>
</div>
);
export async function getServerSideProps() {
// Call an external API endpoint to get posts.
const res = await fetch('https://restcountries.eu/rest/v2/all');
const countries = await res.json();
// By returning { props: posts }, the Blog component
// will receive `posts` as a prop at build time
return {
props: {
countries,
},
};
}
export default Home;
The URL dynamically routes ok. For example, when you click on Afghanistan the URL shows http://localhost:3000/p/Afghanistan.
My country component however doesn't display anything and undefined is printed to the terminal.
Example of URL and response from URL: https://restcountries.eu/rest/v2/name/Afghanistan
{
name: "Afghanistan"
}
Apologies if a noob question. Trying to learn nextjs
export async function getServerSideProps(context) {
const { id } = context.query;
const res = await fetch(`https://restcountries.eu/rest/v2/name/${id}`);
const country = await res.json();
console.log(`Fetched place: ${country.name}`);
return { props: { country } };
}
you are returning a nested object from above function
{ props: { country:country } }
so this prop will be attached to props as like this:
`props.props`
this is how you should implement
const Country = props => (
<Layout>
<h1>{props.props.country.name}</h1>
<span>{props.props.country.capital}</span>
</Layout>
);
In early version of next.js I think updated after version 9, we were not returning from serverside function by using props. As of now correct way of implementation is
return {
props: {
countries,
},
};
Just to add to the accepted answer, you could also destructure to make it (imho) more readable. This is entirely optional though
const Country = ({ country }) => (
<Layout>
<h1>{country.name}</h1>
<span>{country.capital}</span>
</Layout>
);
There's nothing wrong in how you're handling the dynamic routing of the page. The issue is that the data returned by the API is an array but your code expects it to be an object. You can retrieve the first item from the array and pass that to the component from getServerSideProps.
export async function getServerSideProps(context) {
const { id } = context.params; // Use `context.params` to get dynamic params
const res = await fetch(`https://restcountries.com/v2/name/${id}`); // Using `restcountries.com` as `restcountries.eu` is no longer accessible
const countryList = await res.json();
const [country] = countryList; // Get first item in array returned from API
return { props: { country } };
}
const Country = ({ country }) => {
console.log(country);
return (
<>
<h1>{country.name}</h1>
<span>{country.capital}</span>
</>
);
};
export default Country;