Next.js: How to get the URL paramters [duplicate] - reactjs

Question

When I click on a link in my /index.js, it brings me to /about.js page.
However, when I'm passing parameter name through URL (like /about?name=leangchhean) from /index.js to /about.js, I don't know how to get it in the /about.js page.
index.js
import Link from 'next/link';
export default () => (
<div>
Click{' '}
<Link href={{ pathname: 'about', query: { name: 'leangchhean' } }}>
<a>here</a>
</Link>{' '}
to read more
</div>
);

Answer 1

Use router-hook.
You can use the useRouter hook in any component in your application.
https://nextjs.org/docs/api-reference/next/router#userouter
pass Param
import Link from "next/link";
<Link href={{ pathname: '/search', query: { keyword: 'this way' } }}><a>path</a></Link>
Or
import Router from 'next/router'
Router.push({
pathname: '/search',
query: { keyword: 'this way' },
})
In Component
import { useRouter } from 'next/router'
export default () => {
const router = useRouter()
console.log(router.query);
...
}

Answer 2

Using Next.js 9 or above you can get query parameters:
With router:
import { useRouter } from 'next/router'
const Index = () => {
const router = useRouter()
const {id} = router.query
return(<div>{id}</div>)
}
With getInitialProps:
const Index = ({id}) => {
return(<div>{id}</div>)
}
Index.getInitialProps = async ({ query }) => {
const {id} = query
return {id}
}

Answer 3

url prop is deprecated as of Next.js version 6:
https://github.com/zeit/next.js/blob/master/errors/url-deprecated.md
To get the query parameters, use getInitialProps:
For stateless components
import Link from 'next/link'
const About = ({query}) => (
<div>Click <Link href={{ pathname: 'about', query: { name: 'leangchhean' }}}><a>here</a></Link> to read more</div>
)
About.getInitialProps = ({query}) => {
return {query}
}
export default About;
For regular components
class About extends React.Component {
static getInitialProps({query}) {
return {query}
}
render() {
console.log(this.props.query) // The query is available in the props object
return <div>Click <Link href={{ pathname: 'about', query: { name: 'leangchhean' }}}><a>here</a></Link> to read more</div>
}
}
The query object will be like: url.com?a=1&b=2&c=3 becomes: {a:1, b:2, c:3}

Answer 4

For those looking for a solution that works with static exports, try the solution listed here: https://github.com/zeit/next.js/issues/4804#issuecomment-460754433
In a nutshell, router.query works only with SSR applications, but router.asPath still works.
So can either configure the query pre-export in next.config.js with exportPathMap (not dynamic):
return {
'/': { page: '/' },
'/about': { page: '/about', query: { title: 'about-us' } }
}
}
Or use router.asPath and parse the query yourself with a library like query-string:
import { withRouter } from "next/router";
import queryString from "query-string";
export const withPageRouter = Component => {
return withRouter(({ router, ...props }) => {
router.query = queryString.parse(router.asPath.split(/\?/)[1]);
return <Component {...props} router={router} />;
});
};

Answer 5

Get it by using the below code in the about.js page:
// pages/about.js
import Link from 'next/link'
export default ({ url: { query: { name } } }) => (
<p>Welcome to About! { name }</p>
)

Answer 6

I know 2 ways to do this:
A Server-Side way, and a Client-Side way.
Method #1: SSR (Server-Side Rendering):
You should use Query Context for that page.
So use getServerSideProps instead of getStaticProps
import React from "react";
export async function getServerSideProps(context) {
const page = (parseInt(context.query.page) || 1).toString();
// Here we got the "page" query parameter from Context
// Default value is "1"
const res = await fetch(`https://....com/api/products/?page=${page}`);
const products = await res.json();
return {props: {products: products.results}}
// will be passed to the page component as props
}
const Page = (props) =>{
const products = props.products;
return (
<ul>
{products.map((product) => (
<li key={product.id}>{product.name}</li>
))}
</ul>);
}
export default Page
The reason is that: this data cannot be pre-rendered ahead of user's request, so it must be Server-Side Rendered (SSR) on every request.
Static Pages: Use getStaticProps
Changing Content: use getServerSideProps
And here the content is changing based on query Parameters
Reference: https://nextjs.org/docs/api-reference/data-fetching/get-server-side-props
Method #2: Next Router (Client Side):
import {useState, useEffect} from "react";
import { useRouter } from 'next/router'
const Page = () =>{
const [products, setProducts] = useState([]);
const [page, setPage] =useState((useRouter().query.page || 1).toString());
// getting the page query parameter
// Default value is equal to "1"
useEffect(()=>{
(async()=>{
const res = await fetch(`https://....com/api/products/?page=${page}`);
const products = await res.json();
setProducts(products.results);
// This code will be executed only once at begining of the loading of the page
// It will not be executed again unless you cahnge the page
})()
},[page]);
return (
<ul>
{products.map((product) => (
<li key={product.id}>{product.name}</li>
))}
</ul>
);
}
export default Page
Reference: https://nextjs.org/docs/api-reference/next/router

Answer 7

If you need to retrieve a URL query from outside a component:
import router from 'next/router'
console.log(router.query)

Answer 8

import { useRouter } from 'next/router';
function componentName() {
const router = useRouter();
console.log('router obj', router);
}
We can find the query object inside a router using which we can get all query string parameters.

Answer 9

Using {useRouter} from "next/router"; helps but sometimes you won't get the values instead u get the param name itself as value.
This issue happens when u are trying to access query params via de-structuring like:
let { categoryId = "", sellerId = "" } = router.query;
and the solution that worked for me is try to access the value directly from query object:
let categoryId = router.query['categoryId'] || '';
let sellerId = router.query['sellerId'] || '';

Answer 10

Post.getInitialProps = async function(context) {
const data = {}
try{
data.queryParam = queryString.parse(context.req.url.split('?')[1]);
}catch(err){
data.queryParam = queryString.parse(window.location.search);
}
return { data };
};

Answer 11

import { useRouter } from 'next/router'
const Home = () => {
const router = useRouter();
const {param} = router.query
return(<div>{param}</div>)
}
Also you can use getInitialProps, more details refer the below tutorial.
get params from url in nextjs

Answer 12

What worked for me in Nextjs 13 pages in the app directory (SSR)
Pass params and searchParams to the page:
export default function SomePage(params, searchParams) {
console.log(params);
console.log(searchParams);
return <div>Hello, Next.js!</div>;
With some builds there may be a bug that can be solved by adding:
export const dynamic='force-dynamic';
especially when deploying on Vercel.
ref: https://beta.nextjs.org/docs/api-reference/file-conventions/page#searchparams-optional
https://github.com/vercel/next.js/issues/43077